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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 changes.","units":{"USD":[{"start":"2007-01-01","end":"2007-12-31","val":358000000,"accn":"0001193125-10-027861","fy":2009,"fp":"FY","form":"10-K","filed":"2010-02-11","frame":"CY2007"},{"start":"2008-01-01","end":"2008-06-30","val":538000000,"accn":"0001193125-09-154417","fy":2009,"fp":"Q2","form":"10-Q","filed":"2009-07-24"},{"start":"2008-01-01","end":"2008-09-30","val":711000000,"accn":"0001193125-09-212352","fy":2009,"fp":"Q3","form":"10-Q","filed":"2009-10-23"},{"start":"2008-01-01","end":"2008-12-31","val":1423000000,"accn":"0001193125-10-027861","fy":2009,"fp":"FY","form":"10-K","filed":"2010-02-11"},{"start":"2008-01-01","end":"2008-12-31","val":1423000000,"accn":"0001193125-11-029695","fy":2010,"fp":"FY","form":"10-K","filed":"2011-02-10","frame":"CY2008"},{"start":"2009-01-01","end":"2009-03-31","val":-1055000000,"accn":"0001193125-10-092555","fy":2010,"fp":"Q1","form":"10-Q","filed":"2010-04-26","frame":"CY2009Q1"},{"start":"2009-01-01","end":"2009-06-30","val":-311000000,"accn":"0001193125-09-154417","fy":2009,"fp":"Q2","form":"10-Q","filed":"2009-07-24"},{"start":"2009-01-01","end":"2009-06-30","val":-311000000,"accn":"0001193125-10-165467","fy":2010,"fp":"Q2","form":"10-Q","filed":"2010-07-26"},{"start":"2009-01-01","end":"2009-09-30","val":305000000,"accn":"0001193125-09-212352","fy":2009,"fp":"Q3","form":"10-Q","filed":"2009-10-23"},{"start":"2009-01-01","end":"2009-09-30","val":305000000,"accn":"0001193125-10-235003","fy":2010,"fp":"Q3","form":"10-Q","filed":"2010-10-25"},{"start":"2009-01-01","end":"2009-12-31","val":122000000,"accn":"0001193125-10-027861","fy":2009,"fp":"FY","form":"10-K","filed":"2010-02-11"},{"start":"2009-01-01","end":"2009-12-31","val":122000000,"accn":"0001193125-11-029695","fy":2010,"fp":"FY","form":"10-K","filed":"2011-02-10"},{"start":"2009-01-01","end":"2009-12-31","val":122000000,"accn":"0001193125-12-047752","fy":2011,"fp":"FY","form":"10-K","filed":"2012-02-09","frame":"CY2009"},{"start":"2010-01-01","end":"2010-03-31","val":339000000,"accn":"0001193125-10-092555","fy":2010,"fp":"Q1","form":"10-Q","filed":"2010-04-26"},{"start":"2010-01-01","end":"2010-03-31","val":339000000,"accn":"0001193125-11-106870","fy":2011,"fp":"Q1","form":"10-Q","filed":"2011-04-25","frame":"CY2010Q1"},{"start":"2010-01-01","end":"2010-06-30","val":548000000,"accn":"0001193125-10-165467","fy":2010,"fp":"Q2","form":"10-Q","filed":"2010-07-26"},{"start":"2010-01-01","end":"2010-06-30","val":548000000,"accn":"0001193125-11-195231","fy":2011,"fp":"Q2","form":"10-Q","filed":"2011-07-25"},{"start":"2010-01-01","end":"2010-09-30","val":1282000000,"accn":"0001193125-10-235003","fy":2010,"fp":"Q3","form":"10-Q","filed":"2010-10-25"},{"start":"2010-01-01","end":"2010-09-30","val":1282000000,"accn":"0001193125-11-277919","fy":2011,"fp":"Q3","form":"10-Q","filed":"2011-10-24"},{"start":"2010-01-01","end":"2010-12-31","val":-366000000,"accn":"0001193125-11-029695","fy":2010,"fp":"FY","form":"10-K","filed":"2011-02-10"},{"start":"2010-01-01","end":"2010-12-31","val":-366000000,"accn":"0001193125-12-047752","fy":2011,"fp":"FY","form":"10-K","filed":"2012-02-09"},{"start":"2010-01-01","end":"2010-12-31","val":-366000000,"accn":"0001193125-13-042195","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-07","frame":"CY2010"},{"start":"2011-01-01","end":"2011-03-31","val":357000000,"accn":"0001193125-11-106870","fy":2011,"fp":"Q1","form":"10-Q","filed":"2011-04-25"},{"start":"2011-01-01","end":"2011-03-31","val":357000000,"accn":"0001193125-12-196669","fy":2012,"fp":"Q1","form":"10-Q","filed":"2012-04-30","frame":"CY2011Q1"},{"start":"2011-01-01","end":"2011-06-30","val":1313000000,"accn":"0001193125-11-195231","fy":2011,"fp":"Q2","form":"10-Q","filed":"2011-07-25"},{"start":"2011-01-01","end":"2011-06-30","val":1313000000,"accn":"0001193125-12-322870","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-07-30"},{"start":"2011-01-01","end":"2011-09-30","val":1883000000,"accn":"0001193125-11-277919","fy":2011,"fp":"Q3","form":"10-Q","filed":"2011-10-24"},{"start":"2011-01-01","end":"2011-09-30","val":1883000000,"accn":"0001193125-12-436499","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-10-26"},{"start":"2011-01-01","end":"2011-12-31","val":1877000000,"accn":"0001193125-12-047752","fy":2011,"fp":"FY","form":"10-K","filed":"2012-02-09"},{"start":"2011-01-01","end":"2011-12-31","val":1877000000,"accn":"0001193125-13-042195","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-07"},{"start":"2011-01-01","end":"2011-12-31","val":1877000000,"accn":"0000101829-14-000006","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-06","frame":"CY2011"},{"start":"2012-01-01","end":"2012-03-31","val":402000000,"accn":"0001193125-12-196669","fy":2012,"fp":"Q1","form":"10-Q","filed":"2012-04-30"},{"start":"2012-01-01","end":"2012-03-31","val":402000000,"accn":"0000101829-13-000007","fy":2013,"fp":"Q1","form":"10-Q","filed":"2013-04-26","frame":"CY2012Q1"},{"start":"2012-01-01","end":"2012-06-30","val":90000000,"accn":"0001193125-1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Cash Equivalents, and Short-term Investments","description":"Cash includes currency on hand as well as demand deposits with banks or financial institutions. It also includes other kinds of accounts that have the general characteristics of demand deposits in that the customer may deposit additional funds at any time and effectively may withdraw funds at any time without prior notice or penalty. Cash equivalents, excluding items classified as marketable securities, include short-term, highly liquid Investments that are both readily convertible to known amounts of cash, and so near their maturity that they present minimal risk of changes in value because of changes in interest rates. Generally, only investments with original maturities of three months or less qualify under that definition. Original maturity means original maturity to the entity holding the investment. For example, both a three-month US Treasury bill and a three-year Treasury note purchased three months from maturity qualify as cash equivalents. However, a Treasury note purchased three years ago does not become a cash equivalent when its remaining maturity is three months. Short-term investments, exclusive of cash equivalents, generally consist of marketable securities intended to be sold within one year (or the normal operating cycle if longer) and may include trading securities, available-for-sale securities, or held-to-maturity securities (if maturing within one year), as applicable.","units":{"USD":[{"end":"2006-12-31","val":2546000000,"accn":"0001193125-10-027861","fy":2009,"fp":"FY","form":"10-K","filed":"2010-02-11","frame":"CY2006Q4I"},{"end":"2007-12-31","val":2904000000,"accn":"0001193125-09-154417","fy":2009,"fp":"Q2","form":"10-Q","filed":"2009-07-24"},{"end":"2007-12-31","val":2904000000,"accn":"0001193125-09-212352","fy":2009,"fp":"Q3","form":"10-Q","filed":"2009-10-23"},{"end":"2007-12-31","val":2904000000,"accn":"0001193125-10-027861","fy":2009,"fp":"FY","form":"10-K","filed":"2010-02-11"},{"end":"2007-12-31","val":2904000000,"accn":"0001193125-11-029695","fy":2010,"fp":"FY","form":"10-K","filed":"2011-02-10","frame":"CY2007Q4I"},{"end":"2008-06-30","val":3442000000,"accn":"0001193125-09-154417","fy":2009,"fp":"Q2","form":"10-Q","filed":"2009-07-24","frame":"CY2008Q2I"},{"end":"2008-09-30","val":3615000000,"accn":"0001193125-09-212352","fy":2009,"fp":"Q3","form":"10-Q","filed":"2009-10-23","frame":"CY2008Q3I"},{"end":"2008-12-31","val":4327000000,"accn":"0001193125-09-154417","fy":2009,"fp":"Q2","form":"10-Q","filed":"2009-07-24"},{"end":"2008-12-31","val":4327000000,"accn":"0001193125-09-212352","fy":2009,"fp":"Q3","form":"10-Q","filed":"2009-10-23"},{"end":"2008-12-31","val":4327000000,"accn":"0001193125-10-027861","fy":2009,"fp":"FY","form":"10-K","filed":"2010-02-11"},{"end":"2008-12-31","val":4327000000,"accn":"0001193125-10-092555","fy":2010,"fp":"Q1","form":"10-Q","filed":"2010-04-26"},{"end":"2008-12-31","val":4327000000,"accn":"0001193125-10-165467","fy":2010,"fp":"Q2","form":"10-Q","filed":"2010-07-26"},{"end":"2008-12-31","val":4327000000,"accn":"0001193125-10-235003","fy":2010,"fp":"Q3","form":"10-Q","filed":"2010-10-25"},{"end":"2008-12-31","val":4327000000,"accn":"0001193125-11-029695","fy":2010,"fp":"FY","form":"10-K","filed":"2011-02-10"},{"end":"2008-12-31","val":4327000000,"accn":"0001193125-12-047752","fy":2011,"fp":"FY","form":"10-K","filed":"2012-02-09","frame":"CY2008Q4I"},{"end":"2009-03-31","val":3272000000,"accn":"0001193125-10-092555","fy":2010,"fp":"Q1","form":"10-Q","filed":"2010-04-26","frame":"CY2009Q1I"},{"end":"2009-06-30","val":4016000000,"accn":"0001193125-09-154417","fy":2009,"fp":"Q2","form":"10-Q","filed":"2009-07-24"},{"end":"2009-06-30","val":4016000000,"accn":"0001193125-10-165467","fy":2010,"fp":"Q2","form":"10-Q","filed":"2010-07-26","frame":"CY2009Q2I"},{"end":"2009-09-30","val":4632000000,"accn":"0001193125-09-212352","fy":2009,"fp":"Q3","form":"10-Q","filed":"2009-10-23"},{"end":"2009-09-30","val":4632000000,"accn":"0001193125-10-235003","fy":2010,"fp":"Q3","form":"10-Q","filed":"2010-10-25","frame":"CY2009Q3I"},{"end":"2009-12-31","val":4449000000,"accn":"0001193125-10-027861","fy":2009,"fp":"FY","form":"10-K","filed":"2010-02-11"},{"end":"2009-12-31","val":4449000000,"accn":"0001193125-10-092555","fy":2010,"fp":"Q1","form":"10-Q","filed":"2010-04-26"},{"end":"2009-12-31","val":4449000000,"accn":"0001193125-10-165467","fy":2010,"fp":"Q2","form":"10-Q","filed":"2010-07-26"},{"end":"2009-12-31","val":4449000000,"accn":"0001193125-10-235003","fy":2010,"fp":"Q3","form":"10-Q","filed":"2010-10-25"},{"end":"2009-12-31","val":4449000000,"accn":"0001193125-11-029695","fy":2010,"fp":"FY","form":"10-K","filed":"2011-02-10"},{"end":"2009-12-31","val":4449000000,"accn":"0001193125-11-106870","fy":2011,"fp":"Q1","form":"10-Q","filed":"2011-04-25"},{"end":"2009-12-31","val":4449000000,"accn":"0001193125-11-195231","fy":2011,"fp":"Q2","form":"10-Q","filed":"2011-07-25"},{"end":"2009-12-31","val":4449000000,"accn":"0001193125-11-277919","fy":2011,"fp":"Q3","form":"10-Q","filed":"2011-10-24"},{"end":"2009-12-31","val":4449000000,"accn":"0001193125-12-047752","fy":2011,"fp":"FY","form":"10-K","filed":"2012-02-09","frame":"CY2009Q4I"},{"end":"2010-03-31","val":4788000000,"accn":"0001193125-10-092555","fy":2010,"fp":"Q1","form":"10-Q","filed":"2010-04-26"},{"end":"2010-03-31","val":4788000000,"accn":"0001193125-11-106870","fy":2011,"fp":"Q1","form":"10-Q","filed":"2011-04-25","frame":"CY2010Q1I"},{"end":"2010-06-30","val":4997000000,"accn":"0001193125-10-165467","fy":2010,"fp":"Q2","form":"10-Q","filed":"2010-07-26"},{"end":"2010-06-30","val":4997000000,"accn":"0001193125-11-195231","fy":2011,"fp":"Q2","form":"10-Q","filed":"2011-07-25","frame":"CY2010Q2I"},{"end":"2010-09-30","val":5731000000,"accn":"0001193125-10-235003","fy":2010,"fp":"Q3","form":"10-Q","filed":"2010-10-25"},{"end":"2010-09-30","val":5731000000,"accn":"0001193125-11-277919","fy":2011,"fp":"Q3","form":"10-Q","filed":"2011-10-24","frame":"CY2010Q3I"},{"end":"2010-12-31","val":4083000000,"accn":"0001193125-11-029695","fy":2010,"fp":"FY","form":"10-K","filed":"2011-02-10"},{"end":"2010-12-31","val":4083000000,"accn":"0001193125-11-106870","fy":2011,"fp":"Q1","form":"10-Q","filed":"2011-04-25"},{"end":"2010-12-31","val":4083000000,"accn":"0001193125-11-195231","fy":2011,"fp":"Q2","form":"10-Q","filed":"2011-07-25"},{"end":"2010-12-31","val":4083000000,"accn":"0001193125-1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Repurchased During Period, Shares","description":"Number of shares that have been repurchased during the period and have not been retired and are not held in treasury. 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Event, Amount (Deprecated 2013-01-31)","description":"Reflects the known or estimated financial effect of the event, or transaction that occurred between the balance sheet date and the date the financial statements are issued or available to be issued.","units":{"USD":[{"start":"2012-01-01","end":"2012-09-30","val":400000000,"accn":"0001193125-12-436499","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-10-26"}]}},"TaxAdjustmentsSettlementsAndUnusualProvisions":{"label":"Tax Adjustments, Settlements, and Unusual Provisions","description":"Amount of increase (decrease) to previously recorded tax expense. Includes, but is not limited to, significant settlements of income tax disputes, and unusual tax positions or infrequent actions taken by the entity, including tax assessment reversal, and IRS tax 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