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Cash and cash equivalents are the amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Includes effect from exchange rate 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A certificate of deposit may be issued in any denomination. Certificates of deposit are generally issued by commercial banks and, therefore, insured by the FDIC (up to the prescribed limit). Certificates of deposit generally restrict holders from withdrawing funds on demand without the incurrence of penalties. Generally, only certificates of deposit with original maturities of three months or less qualify as cash equivalents. Original maturity means original maturity to the entity holding the investment. As a related example, both a three-month US Treasury bill and a three-year Treasury note purchased three months from maturity qualify as cash equivalents. 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Exploration costs may be incurred both before acquiring the related property (sometimes referred to in part as prospecting costs) and after acquiring the property. Principal types of exploration costs, which include depreciation and applicable operating costs of support equipment and facilities and other costs of exploration activities, are: costs of topographical, geographical and geophysical studies, rights of access to properties to conduct those studies, and salaries and other expenses of geologists, geophysical crews, and others conducting those studies. Collectively, these are sometimes referred to as geological and geophysical or \"\"G&G\"\" costs. 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 wells.\"","units":{"USD":[{"start":"1953-01-31","end":"2011-06-30","val":188218,"accn":"0001193125-11-222154","fy":2011,"fp":"Q2","form":"10-Q","filed":"2011-08-15"},{"start":"1953-01-31","end":"2011-09-30","val":188218,"accn":"0001193125-11-310047","fy":2011,"fp":"Q3","form":"10-Q","filed":"2011-11-14"},{"start":"1953-01-31","end":"2011-12-31","val":188218,"accn":"0001193125-14-223941","fy":2011,"fp":"FY","form":"10-K","filed":"2014-06-03"},{"start":"1953-01-31","end":"2012-03-31","val":188218,"accn":"0001193125-14-278244","fy":2012,"fp":"Q1","form":"10-Q","filed":"2014-07-24"},{"start":"1953-01-31","end":"2012-06-30","val":188218,"accn":"0001193125-14-278270","fy":2012,"fp":"Q2","form":"10-Q","filed":"2014-07-24"},{"start":"1953-01-31","end":"2012-09-30","val":188218,"accn":"0001193125-14-278300","fy":2012,"fp":"Q3","form":"10-Q","filed":"2014-07-24"},{"start":"1953-01-31","end":"2012-12-31","val":188218,"accn":"0001193125-14-326550","fy":2012,"fp":"FY","form":"10-K","filed":"2014-08-29"}]}},"FairValueInputsDiscountRate":{"label":"Fair Value Inputs, Discount Rate (Deprecated 2018-01-31)","description":"Interest rate used to find the present value of an amount to be paid or received in the future as an input to measure fair value. 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Includes fees from depositor accounts, credit cards, merchant discounts, and fiduciary and trust activities, guarantee fees, investment advisory, management, and administrative fees, transfer agent fees, and insurance commissions.","units":{"USD":[{"start":"2009-08-01","end":"2009-08-31","val":25000,"accn":"0001193125-14-326550","fy":2012,"fp":"FY","form":"10-K","filed":"2014-08-29"},{"start":"2009-08-01","end":"2009-08-31","val":25000,"accn":"0001193125-14-223941","fy":2011,"fp":"FY","form":"10-K","filed":"2014-06-03"}]}},"GainLossRelatedToLitigationSettlement":{"label":"Gain (Loss) Related to Litigation Settlement","description":"Amount of gain (loss) recognized in settlement of litigation and insurance claims. 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Expenses","description":"Amount of expense classified as other.","units":{"USD":[{"start":"1953-01-31","end":"2011-06-30","val":364865,"accn":"0001193125-11-222154","fy":2011,"fp":"Q2","form":"10-Q","filed":"2011-08-15"},{"start":"1953-01-31","end":"2011-09-30","val":364865,"accn":"0001193125-11-310047","fy":2011,"fp":"Q3","form":"10-Q","filed":"2011-11-14"},{"start":"1953-01-31","end":"2011-12-31","val":364865,"accn":"0001193125-14-223941","fy":2011,"fp":"FY","form":"10-K","filed":"2014-06-03"},{"start":"1953-01-31","end":"2012-03-31","val":364865,"accn":"0001193125-14-278244","fy":2012,"fp":"Q1","form":"10-Q","filed":"2014-07-24"},{"start":"1953-01-31","end":"2012-06-30","val":364865,"accn":"0001193125-14-278270","fy":2012,"fp":"Q2","form":"10-Q","filed":"2014-07-24"},{"start":"1953-01-31","end":"2012-09-30","val":364865,"accn":"0001193125-14-278300","fy":2012,"fp":"Q3","form":"10-Q","filed":"2014-07-24"},{"start":"1953-01-31","end":"2012-12-31","val":364865,"accn":"0001193125-14-326550","fy":2012,"fp":"FY","form":"10-K","filed":"2014-08-29"}]}},"PaymentsToAcquireAdditionalInterestInSubsidiaries":{"label":"Payments 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to Acquire Oil and Gas Equipment","description":"The cash outflow to purchase long lived physical asset use for the normal oil and gas operations and not intended for resale.","units":{"USD":[{"start":"1953-01-31","end":"2011-12-31","val":74623,"accn":"0001193125-14-223941","fy":2011,"fp":"FY","form":"10-K","filed":"2014-06-03"},{"start":"1953-01-31","end":"2012-12-31","val":74623,"accn":"0001193125-14-326550","fy":2012,"fp":"FY","form":"10-K","filed":"2014-08-29"}]}},"PaymentsToAcquireOilAndGasProperty":{"label":"Payments to Acquire Oil and Gas Property","description":"The cash outflow to purchase of mineral interests in oil and gas properties for use in the normal oil and gas operations and not intended for resale.","units":{"USD":[{"start":"2010-01-01","end":"2010-06-30","val":46083,"accn":"0001193125-11-222154","fy":2011,"fp":"Q2","form":"10-Q","filed":"2011-08-15"},{"start":"2010-01-01","end":"2010-09-30","val":66633,"accn":"0001193125-11-310047","fy":2011,"fp":"Q3","form":"10-Q","filed":"2011-11-14"},{"start":"2010-01-01","end":"2010-12-31","val":147795,"accn":"0001193125-14-223941","fy":2011,"fp":"FY","form":"10-K","filed":"2014-06-03","frame":"CY2010"},{"start":"2011-01-01","end":"2011-03-31","val":3500,"accn":"0001193125-14-278244","fy":2012,"fp":"Q1","form":"10-Q","filed":"2014-07-24","frame":"CY2011Q1"},{"start":"1953-01-31","end":"2011-06-30","val":6631945,"accn":"0001193125-11-222154","fy":2011,"fp":"Q2","form":"10-Q","filed":"2011-08-15"},{"start":"2011-01-01","end":"2011-06-30","val":30898,"accn":"0001193125-14-278270","fy":2012,"fp":"Q2","form":"10-Q","filed":"2014-07-24"},{"start":"2011-01-01","end":"2011-06-30","val":30898,"accn":"0001193125-11-222154","fy":2011,"fp":"Q2","form":"10-Q","filed":"2011-08-15"},{"start":"1953-01-31","end":"2011-09-30","val":6631945,"accn":"0001193125-11-310047","fy":2011,"fp":"Q3","form":"10-Q","filed":"2011-11-14"},{"start":"2011-01-01","end":"2011-09-30","val":30898,"accn":"0001193125-14-278300","fy":2012,"fp":"Q3","form":"10-Q","filed":"2014-07-24"},{"start":"2011-01-01","end":"2011-09-30","val":30898,"accn":"0001193125-11-310047","fy":2011,"fp":"Q3","form":"10-Q","filed":"2011-11-14"},{"start":"1953-01-31","end":"2011-12-31","val":6652219,"accn":"0001193125-14-223941","fy":2011,"fp":"FY","form":"10-K","filed":"2014-06-03"},{"start":"2011-01-01","end":"2011-12-31","val":51172,"accn":"0001193125-14-326550","fy":2012,"fp":"FY","form":"10-K","filed":"2014-08-29","frame":"CY2011"},{"start":"2011-01-01","end":"2011-12-31","val":51172,"accn":"0001193125-14-223941","fy":2011,"fp":"FY","form":"10-K","filed":"2014-06-03"},{"start":"1953-01-31","end":"2012-03-31","val":6652219,"accn":"0001193125-14-278244","fy":2012,"fp":"Q1","form":"10-Q","filed":"2014-07-24"},{"start":"1953-01-31","end":"2012-06-30","val":6652219,"accn":"0001193125-14-278270","fy":2012,"fp":"Q2","form":"10-Q","filed":"2014-07-24"},{"start":"1953-01-31","end":"2012-09-30","val":6652219,"accn":"0001193125-14-278300","fy":2012,"fp":"Q3","form":"10-Q","filed":"2014-07-24"},{"start":"1953-01-31","end":"2012-12-31","val":6652219,"accn":"0001193125-14-326550","fy":2012,"fp":"FY","form":"10-K","filed":"2014-08-29"}]}},"PaymentsToAcquirePropertyPlantAndEquipment":{"label":"Payments to Acquire Property, Plant, and Equipment","description":"The cash outflow associated with the acquisition of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale; includes cash outflows to pay for construction of self-constructed assets.","units":{"USD":[{"start":"1953-01-31","end":"2011-06-30","val":74623,"accn":"0001193125-11-222154","fy":2011,"fp":"Q2","form":"10-Q","filed":"2011-08-15"},{"start":"1953-01-31","end":"2011-09-30","val":74623,"accn":"0001193125-11-310047","fy":2011,"fp":"Q3","form":"10-Q","filed":"2011-11-14"},{"start":"1953-01-31","end":"2012-03-31","val":74623,"accn":"0001193125-14-278244","fy":2012,"fp":"Q1","form":"10-Q","filed":"2014-07-24"},{"start":"1953-01-31","end":"2012-06-30","val":74623,"accn":"0001193125-14-278270","fy":2012,"fp":"Q2","form":"10-Q","filed":"2014-07-24"},{"start":"1953-01-31","end":"2012-09-30","val":74623,"accn":"0001193125-14-278300","fy":2012,"fp":"Q3","form":"10-Q","filed":"2014-07-24"}]}},"PaymentsToAcquireRestrictedCertificatesOfDeposit":{"label":"Payments to Acquire Restricted Certificates of Deposit","description":"The cash outflow from temporary investment with specific maturity and interest rate that are prohibited for current 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