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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":"2012-09-30","val":7414000,"accn":"0001193125-12-465370","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-11-13","frame":"CY2012Q3I"},{"end":"2012-12-31","val":8168000,"accn":"0001193125-13-109613","fy":2012,"fp":"FY","form":"10-K","filed":"2013-03-15","frame":"CY2012Q4I"}]}},"AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsAmortizedCost":{"label":"Debt Securities, Available-for-Sale, Amortized Cost, Maturity, Allocated and Single Maturity Date, after Year One Through Five","description":"Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), with single maturity date and allocated without single maturity date, maturing in second through fifth fiscal year following current fiscal year. 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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":"2012-09-30","val":525000,"accn":"0001193125-12-465370","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-11-13","frame":"CY2012Q3I"},{"end":"2012-12-31","val":478000,"accn":"0001193125-13-109613","fy":2012,"fp":"FY","form":"10-K","filed":"2013-03-15","frame":"CY2012Q4I"}]}},"AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsAmortizedCost":{"label":"Debt Securities, Available-for-Sale, Amortized Cost, Maturity, Allocated and Single Maturity Date, after Year 10","description":"Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), with single maturity date and allocated without single maturity date, maturing after tenth 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":"2012-09-30","val":225000,"accn":"0001193125-12-465370","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-11-13","frame":"CY2012Q3I"},{"end":"2012-12-31","val":219000,"accn":"0001193125-13-109613","fy":2012,"fp":"FY","form":"10-K","filed":"2013-03-15","frame":"CY2012Q4I"}]}},"AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsFairValue":{"label":"Debt Securities, Available-for-Sale, Fair Value, Maturity, Allocated and Single Maturity Date, after Year 10","description":"Fair value of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), with single maturity date and allocated without single maturity date, maturing after tenth 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":"2012-09-30","val":314000,"accn":"0001193125-12-465370","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-11-13","frame":"CY2012Q3I"},{"end":"2012-12-31","val":347000,"accn":"0001193125-13-109613","fy":2012,"fp":"FY","form":"10-K","filed":"2013-03-15","frame":"CY2012Q4I"}]}},"AvailableForSaleSecuritiesDebtMaturitiesAmortizedCost":{"label":"Available-for-sale Securities, Debt Maturities, Amortized Cost Basis (Deprecated 2014-01-31)","description":"Amount of available-for-sale debt securities at cost, net of adjustments, which include, but are not limited to, accretion, amortization, collection of cash, previous other-than-temporary impairments (OTTI) recognized in earnings (less any cumulative-effect adjustments, as defined) and fair value hedge accounting adjustments.","units":{"USD":[{"end":"2012-09-30","val":7237000,"accn":"0001193125-12-465370","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-11-13","frame":"CY2012Q3I"},{"end":"2012-12-31","val":4646000,"accn":"0001193125-13-109613","fy":2012,"fp":"FY","form":"10-K","filed":"2013-03-15","frame":"CY2012Q4I"}]}},"AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearAmortizedCost":{"label":"Debt Securities, Available-for-Sale, Amortized Cost, Maturity, Allocated and Single Maturity Date, Year One","description":"Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), with single maturity date and allocated without single maturity date, maturing in next fiscal year following current fiscal year. 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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. 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