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Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item represents Available-for-sale Securities which consist of all investments in certain debt and equity securities neither classified as trading or held-to-maturity securities. A debt security represents a creditor relationship with an enterprise. Debt securities include, among other items, US Treasury securities, US government securities, municipal securities, corporate bonds, convertible debt, commercial paper, and all securitized debt instruments. An equity security represents an ownership interest in an enterprise or the right to acquire or dispose of an ownership interest in an enterprise at fixed or determinable prices. Equity securities include, among other things, common stock, certain preferred stock, warrant rights, call options, and put options, but do not include convertible debt. 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-01","end":"2023-12-31","val":5102000000,"accn":"0000060086-24-000029","fy":2023,"fp":"FY","form":"10-K","filed":"2024-02-06"},{"start":"2023-01-01","end":"2023-12-31","val":5102000000,"accn":"0000060086-25-000036","fy":2024,"fp":"FY","form":"10-K","filed":"2025-02-11"},{"start":"2023-01-01","end":"2023-12-31","val":5102000000,"accn":"0000060086-26-000008","fy":2025,"fp":"FY","form":"10-K","filed":"2026-02-10","frame":"CY2023"},{"start":"2024-01-01","end":"2024-12-31","val":5107000000,"accn":"0000060086-25-000036","fy":2024,"fp":"FY","form":"10-K","filed":"2025-02-11"},{"start":"2024-01-01","end":"2024-12-31","val":5107000000,"accn":"0000060086-26-000008","fy":2025,"fp":"FY","form":"10-K","filed":"2026-02-10","frame":"CY2024"},{"start":"2025-01-01","end":"2025-12-31","val":4750000000,"accn":"0000060086-26-000008","fy":2025,"fp":"FY","form":"10-K","filed":"2026-02-10","frame":"CY2025"}]}},"CededPremiumsEarnedAccidentAndHealth":{"label":"Ceded 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Exploration costs also include costs of carrying and retaining undeveloped properties, such as delay rentals, ad valorem taxes on properties, legal costs for title defense, the maintenance of land and lease records, dry hole contributions and bottom hole contributions, costs of drilling and equipping exploratory wells and costs of drilling exploratory-type stratigraphic test 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Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).","units":{"USD":[{"end":"2012-12-31","val":9000000,"accn":"0001193125-13-070611","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22","frame":"CY2012Q4I"},{"end":"2013-12-31","val":8000000,"accn":"0001193125-14-064964","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-24","frame":"CY2013Q4I"},{"end":"2014-12-31","val":7000000,"accn":"0001193125-15-058679","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-24","frame":"CY2014Q4I"},{"end":"2015-12-31","val":6000000,"accn":"0001193125-16-470141","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19","frame":"CY2015Q4I"}]}},"LifeSettlementContractsFairValueMaturingInYearThree":{"label":"Life Settlement Contract, Fair Value, Maturity, Year Three","description":"Fair value of life settlement contract accounted for under fair value method maturing in third fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).","units":{"USD":[{"end":"2012-12-31","val":11000000,"accn":"0001193125-13-070611","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22","frame":"CY2012Q4I"},{"end":"2013-12-31","val":9000000,"accn":"0001193125-14-064964","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-24","frame":"CY2013Q4I"},{"end":"2014-12-31","val":9000000,"accn":"0001193125-15-058679","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-24","frame":"CY2014Q4I"},{"end":"2015-12-31","val":8000000,"accn":"0001193125-16-470141","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19","frame":"CY2015Q4I"}]}},"LifeSettlementContractsFairValueMaturingInYearTwo":{"label":"Life Settlement Contract, Fair Value, Maturity, Year Two","description":"Fair value of life settlement contract accounted for under fair value method maturing in second fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).","units":{"USD":[{"end":"2012-12-31","val":13000000,"accn":"0001193125-13-070611","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22","frame":"CY2012Q4I"},{"end":"2013-12-31","val":11000000,"accn":"0001193125-14-064964","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-24","frame":"CY2013Q4I"},{"end":"2014-12-31","val":10000000,"accn":"0001193125-15-058679","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-24","frame":"CY2014Q4I"},{"end":"2015-12-31","val":10000000,"accn":"0001193125-16-470141","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19","frame":"CY2015Q4I"}]}},"LifeSettlementContractsFairValueMethodCarryingAmount":{"label":"Life Settlement Contracts, Fair Value","description":"Fair value amount of life settlement contracts accounted for under the fair value method.","units":{"USD":[{"end":"2010-12-31","val":598000000,"accn":"0001193125-11-043352","fy":2010,"fp":"FY","form":"10-K","filed":"2011-02-23","frame":"CY2010Q4I"},{"end":"2011-12-31","val":117000000,"accn":"0001193125-12-072891","fy":2011,"fp":"FY","form":"10-K","filed":"2012-02-22","frame":"CY2011Q4I"},{"end":"2012-12-31","val":100000000,"accn":"0001193125-13-070611","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22","frame":"CY2012Q4I"},{"end":"2013-12-31","val":88000000,"accn":"0001193125-14-064964","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-24","frame":"CY2013Q4I"},{"end":"2014-12-31","val":82000000,"accn":"0001193125-15-058679","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-24","frame":"CY2014Q4I"},{"end":"2015-12-31","val":74000000,"accn":"0001193125-16-470141","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19","frame":"CY2015Q4I"}]}},"LifeSettlementContractsFairValueMethodFaceValue":{"label":"Life Settlement Contracts, Fair Value Method, Face Value","description":"Face value (death benefits) of the life insurance policies underlying the life settlement contracts accounted for under the fair value method.","units":{"USD":[{"end":"2010-12-31","val":129000000,"accn":"0001193125-11-043352","fy":2010,"fp":"FY","form":"10-K","filed":"2011-02-23","frame":"CY2010Q4I"},{"end":"2011-12-31","val":535000000,"accn":"0001193125-12-072891","fy":2011,"fp":"FY","form":"10-K","filed":"2012-02-22","frame":"CY2011Q4I"},{"end":"2012-12-31","val":405000000,"accn":"0001193125-13-070611","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22","frame":"CY2012Q4I"},{"end":"2013-12-31","val":378000000,"accn":"0001193125-14-064964","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-24","frame":"CY2013Q4I"},{"end":"2014-12-31","val":339000000,"accn":"0001193125-15-058679","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-24","frame":"CY2014Q4I"},{"end":"2015-12-31","val":305000000,"accn":"0001193125-16-470141","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19","frame":"CY2015Q4I"}]}},"LifeSettlementContractsFairValueMethodFaceValueMaturingAfterYearFive":{"label":"Life Settlement Contract, Fair Value Method, Face Value, Maturity, after Year Five","description":"Face value of life insurance policy underlying life settlement contract accounted for under fair value method maturing after fifth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).","units":{"USD":[{"end":"2012-12-31","val":237000000,"accn":"0001193125-13-070611","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22","frame":"CY2012Q4I"},{"end":"2013-12-31","val":217000000,"accn":"0001193125-14-064964","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-24","frame":"CY2013Q4I"},{"end":"2014-12-31","val":187000000,"accn":"0001193125-15-058679","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-24","frame":"CY2014Q4I"},{"end":"2015-12-31","val":167000000,"accn":"0001193125-16-470141","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19","frame":"CY2015Q4I"}]}},"LifeSettlementContractsFairValueMethodFaceValueMaturingInNextTwelveMonths":{"label":"Life Settlement Contract, Fair Value Method, Face Value, Maturity, Year One","description":"Face value of life insurance policy underlying life settlement contract accounted for under fair value method maturing in next fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).","units":{"USD":[{"end":"2012-12-31","val":41000000,"accn":"0001193125-13-070611","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22","frame":"CY2012Q4I"},{"end":"2013-12-31","val":39000000,"accn":"0001193125-14-064964","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-24","frame":"CY2013Q4I"},{"end":"2014-12-31","val":37000000,"accn":"0001193125-15-058679","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-24","frame":"CY2014Q4I"},{"end":"2015-12-31","val":35000000,"accn":"0001193125-16-470141","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19","frame":"CY2015Q4I"}]}},"LifeSettlementContractsFairValueMethodFaceValueMaturingInYearFive":{"label":"Life Settlement Contract, Fair Value Method, Face Value, Maturity, Year Five","description":"Face value of life insurance policy underlying life settlement contract accounted for under fair value method maturing in fifth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).","units":{"USD":[{"end":"2012-12-31","val":27000000,"accn":"0001193125-13-070611","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22","frame":"CY2012Q4I"},{"end":"2013-12-31","val":26000000,"accn":"0001193125-14-064964","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-24","frame":"CY2013Q4I"},{"end":"2014-12-31","val":26000000,"accn":"0001193125-15-058679","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-24","frame":"CY2014Q4I"},{"end":"2015-12-31","val":21000000,"accn":"0001193125-16-470141","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19","frame":"CY2015Q4I"}]}},"LifeSettlementContractsFairValueMethodFaceValueMaturingInYearFour":{"label":"Life Settlement Contract, Fair Value Method, Face Value, Maturity, Year Four","description":"Face value of life insurance policy underlying life settlement contract accounted for under fair value method maturing in fourth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).","units":{"USD":[{"end":"2012-12-31","val":30000000,"accn":"0001193125-13-070611","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22","frame":"CY2012Q4I"},{"end":"2013-12-31","val":29000000,"accn":"0001193125-14-064964","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-24","frame":"CY2013Q4I"},{"end":"2014-12-31","val":26000000,"accn":"0001193125-15-058679","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-24","frame":"CY2014Q4I"},{"end":"2015-12-31","val":24000000,"accn":"0001193125-16-470141","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19","frame":"CY2015Q4I"}]}},"LifeSettlementContractsFairValueMethodFaceValueMaturingInYearThree":{"label":"Life Settlement Contract, Fair Value Method, Face Value, Maturity, Year Three","description":"Face value of life insurance policy underlying life settlement contract accounted for under fair value method maturing in third fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).","units":{"USD":[{"end":"2012-12-31","val":34000000,"accn":"0001193125-13-070611","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22","frame":"CY2012Q4I"},{"end":"2013-12-31","val":32000000,"accn":"0001193125-14-064964","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-24","frame":"CY2013Q4I"},{"end":"2014-12-31","val":30000000,"accn":"0001193125-15-058679","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-24","frame":"CY2014Q4I"},{"end":"2015-12-31","val":27000000,"accn":"0001193125-16-470141","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19","frame":"CY2015Q4I"}]}},"LifeSettlementContractsFairValueMethodFaceValueMaturingInYearTwo":{"label":"Life Settlement Contract, Fair Value Method, Face Value, Maturity, Year Two","description":"Face value of life insurance policy underlying life settlement contract accounted for under fair value method maturing in second fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).","units":{"USD":[{"end":"2012-12-31","val":36000000,"accn":"0001193125-13-070611","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22","frame":"CY2012Q4I"},{"end":"2013-12-31","val":35000000,"accn":"0001193125-14-064964","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-24","frame":"CY2013Q4I"},{"end":"2014-12-31","val":33000000,"accn":"0001193125-15-058679","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-24","frame":"CY2014Q4I"},{"end":"2015-12-31","val":31000000,"accn":"0001193125-16-470141","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19","frame":"CY2015Q4I"}]}},"LifeSettlementContractsFairValueMethodGainLoss":{"label":"Life Settlement Contracts, Fair Value Method, Gain (Loss)","description":"This item represents the gains or losses recognized and realized during the period on investments in life settlement contracts sold during the period.","units":{"USD":[{"start":"2008-01-01","end":"2008-12-31","val":30000000,"accn":"0001193125-11-043352","fy":2010,"fp":"FY","form":"10-K","filed":"2011-02-23","frame":"CY2008"},{"start":"2009-01-01","end":"2009-12-31","val":24000000,"accn":"0001193125-11-043352","fy":2010,"fp":"FY","form":"10-K","filed":"2011-02-23","frame":"CY2009"},{"start":"2010-01-01","end":"2010-12-31","val":19000000,"accn":"0001193125-11-043352","fy":2010,"fp":"FY","form":"10-K","filed":"2011-02-23","frame":"CY2010"}]}},"LifeSettlementContractsFairValueMethodNumberOfContracts":{"label":"Life Settlement Contracts, Fair Value Method, Number of Contracts","description":"Number of life settlement contracts accounted for under the fair value method.","units":{"Contract":[{"end":"2012-12-31","val":670,"accn":"0001193125-13-070611","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22","frame":"CY2012Q4I"},{"end":"2013-12-31","val":624,"accn":"0001193125-14-064964","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-24","frame":"CY2013Q4I"},{"end":"2014-12-31","val":588,"accn":"0001193125-15-058679","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-24","frame":"CY2014Q4I"},{"end":"2015-12-31","val":550,"accn":"0001193125-16-470141","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19","frame":"CY2015Q4I"}],"pure":[{"end":"2010-12-31","val":903,"accn":"0001193125-11-043352","fy":2010,"fp":"FY","form":"10-K","filed":"2011-02-23","frame":"CY2010Q4I"},{"end":"2011-12-31","val":841,"accn":"0001193125-12-072891","fy":2011,"fp":"FY","form":"10-K","filed":"2012-02-22","frame":"CY2011Q4I"}]}},"LifeSettlementContractsFairValueMethodNumberOfContractsMaturingAfterYearFive":{"label":"Life Settlement Contract, Fair Value Method, Number of Contracts, Maturity, after Year Five","description":"Number of life settlement contracts accounted for under fair value method maturing after fifth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).","units":{"Contract":[{"end":"2012-12-31","val":390,"accn":"0001193125-13-070611","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22","frame":"CY2012Q4I"},{"end":"2013-12-31","val":364,"accn":"0001193125-14-064964","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-24","frame":"CY2013Q4I"},{"end":"2014-12-31","val":318,"accn":"0001193125-15-058679","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-24","frame":"CY2014Q4I"},{"end":"2015-12-31","val":300,"accn":"0001193125-16-470141","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19","frame":"CY2015Q4I"}]}},"LifeSettlementContractsFairValueMethodNumberOfContractsMaturingInNextTwelveMonths":{"label":"Life Settlement Contract, Fair Value Method, Number of Contracts, Maturity, Year One","description":"Number of life settlement contracts accounted for under fair value method maturing in next fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).","units":{"Contract":[{"end":"2012-12-31","val":70,"accn":"0001193125-13-070611","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22","frame":"CY2012Q4I"},{"end":"2013-12-31","val":60,"accn":"0001193125-14-064964","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-24","frame":"CY2013Q4I"},{"end":"2014-12-31","val":60,"accn":"0001193125-15-058679","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-24","frame":"CY2014Q4I"},{"end":"2015-12-31","val":60,"accn":"0001193125-16-470141","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19","frame":"CY2015Q4I"}]}},"LifeSettlementContractsFairValueMethodNumberOfContractsMaturingInYearFive":{"label":"Life Settlement Contract, Fair Value Method, Number of Contracts, Maturity, Year Five","description":"Number of life settlement contracts accounted for under fair value method maturing in fifth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).","units":{"Contract":[{"end":"2012-12-31","val":40,"accn":"0001193125-13-070611","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22","frame":"CY2012Q4I"},{"end":"2013-12-31","val":40,"accn":"0001193125-14-064964","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-24","frame":"CY2013Q4I"},{"end":"2014-12-31","val":50,"accn":"0001193125-15-058679","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-24","frame":"CY2014Q4I"},{"end":"2015-12-31","val":40,"accn":"0001193125-16-470141","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19","frame":"CY2015Q4I"}]}},"LifeSettlementContractsFairValueMethodNumberOfContractsMaturingInYearFour":{"label":"Life Settlement Contract, Fair Value Method, Number of Contracts, Maturity, Year Four","description":"Number of life settlement contracts accounted for under fair value method maturing in fourth fiscal year following current fiscal year. 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