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This item includes treasury stock repurchased by the entity. Note: elements for number of nonredeemable common shares, par value and other disclosure concepts are in another section within stockholders' 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Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.","units":{"USD":[{"end":"2009-12-31","val":98696000,"accn":"0001193125-11-052082","fy":2010,"fp":"FY","form":"10-K","filed":"2011-03-01","frame":"CY2009Q4I"},{"end":"2009-12-31","val":98696000,"accn":"0001193125-10-254096","fy":2010,"fp":"Q3","form":"10-Q","filed":"2010-11-09"},{"end":"2009-12-31","val":98696000,"accn":"0001193125-10-183256","fy":2010,"fp":"Q2","form":"10-Q","filed":"2010-08-09"},{"end":"2010-06-30","val":103117000,"accn":"0001193125-10-183256","fy":2010,"fp":"Q2","form":"10-Q","filed":"2010-08-09","frame":"CY2010Q2I"},{"end":"2010-09-30","val":114176000,"accn":"0001193125-10-254096","fy":2010,"fp":"Q3","form":"10-Q","filed":"2010-11-09","frame":"CY2010Q3I"},{"end":"2010-12-31","val":117601000,"accn":"0001193125-12-336167","fy":2011,"fp":"FY","form":"8-K","filed":"2012-08-06","frame":"CY2010Q4I"},{"end":"2010-12-31","val":117601000,"accn":"0001193125-12-088684","fy":2011,"fp":"FY","form":"10-K","filed":"2012-02-29"},{"end":"2010-12-31","val":117601000,"accn":"0001193125-11-304504","fy":2011,"fp":"Q3","form":"10-Q","filed":"2011-11-09"},{"end":"2010-12-31","val":117601000,"accn":"0001193125-11-216460","fy":2011,"fp":"Q2","form":"10-Q","filed":"2011-08-09"},{"end":"2010-12-31","val":117601000,"accn":"0001193125-11-134211","fy":2011,"fp":"Q1","form":"10-Q","filed":"2011-05-10"},{"end":"2010-12-31","val":117601000,"accn":"0001193125-11-052082","fy":2010,"fp":"FY","form":"10-K","filed":"2011-03-01"},{"end":"2011-03-31","val":120691000,"accn":"0001193125-11-134211","fy":2011,"fp":"Q1","form":"10-Q","filed":"2011-05-10","frame":"CY2011Q1I"},{"end":"2011-06-30","val":120864000,"accn":"0001193125-11-216460","fy":2011,"fp":"Q2","form":"10-Q","filed":"2011-08-09","frame":"CY2011Q2I"},{"end":"2011-09-30","val":115046000,"accn":"0001193125-11-304504","fy":2011,"fp":"Q3","form":"10-Q","filed":"2011-11-09","frame":"CY2011Q3I"},{"end":"2011-12-31","val":96290000,"accn":"0001193125-13-215378","fy":2012,"fp":"FY","form":"8-K","filed":"2013-05-13","frame":"CY2011Q4I"},{"end":"2011-12-31","val":111464000,"accn":"0001193125-13-087636","fy":2012,"fp":"FY","form":"10-K","filed":"2013-03-01"},{"end":"2011-12-31","val":111464000,"accn":"0001193125-12-462994","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-11-09"},{"end":"2011-12-31","val":111464000,"accn":"0001193125-12-346917","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-08-09"},{"end":"2011-12-31","val":111464000,"accn":"0001193125-12-336167","fy":2011,"fp":"FY","form":"8-K","filed":"2012-08-06"},{"end":"2011-12-31","val":111464000,"accn":"0001193125-12-225123","fy":2012,"fp":"Q1","form":"10-Q","filed":"2012-05-10"},{"end":"2011-12-31","val":111464000,"accn":"0001193125-12-088684","fy":2011,"fp":"FY","form":"10-K","filed":"2012-02-29"},{"end":"2012-03-31","val":110279000,"accn":"0001193125-12-225123","fy":2012,"fp":"Q1","form":"10-Q","filed":"2012-05-10","frame":"CY2012Q1I"},{"end":"2012-06-30","val":107787000,"accn":"0001193125-12-346917","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-08-09","frame":"CY2012Q2I"},{"end":"2012-09-30","val":107947000,"accn":"0001193125-12-462994","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-11-09","frame":"CY2012Q3I"},{"end":"2012-12-31","val":94226000,"accn":"0001445305-13-001242","fy":2013,"fp":"Q1","form":"10-Q","filed":"2013-05-09"},{"end":"2012-12-31","val":94226000,"accn":"0001193125-13-215378","fy":2012,"fp":"FY","form":"8-K","filed":"2013-05-13","frame":"CY2012Q4I"},{"end":"2012-12-31","val":108114000,"accn":"0001193125-13-087636","fy":2012,"fp":"FY","form":"10-K","filed":"2013-03-01"},{"end":"2013-03-31","val":92277000,"accn":"0001445305-13-001242","fy":2013,"fp":"Q1","form":"10-Q","filed":"2013-05-09","frame":"CY2013Q1I"}]}},"PropertyPlantAndEquipmentUsefulLifeMaximum":{"label":"Property, Plant and Equipment, Useful Life, Maximum (Deprecated 2012-01-31)","description":"The maximum useful life of long-lived, physical assets used in the normal conduct of business and not intended for resale. Examples include land, buildings, machinery and equipment, and other types of furniture and equipment including, but not limited to, office equipment, furniture and fixtures, and computer equipment and software.","units":{"pure":[{"start":"2011-01-01","end":"2011-12-31","val":7,"accn":"0001193125-12-336167","fy":2011,"fp":"FY","form":"8-K","filed":"2012-08-06","frame":"CY2011"},{"start":"2011-01-01","end":"2011-12-31","val":7,"accn":"0001193125-12-088684","fy":2011,"fp":"FY","form":"10-K","filed":"2012-02-29"}],"Y":[{"start":"2012-01-01","end":"2012-03-31","val":7,"accn":"0001193125-12-225123","fy":2012,"fp":"Q1","form":"10-Q","filed":"2012-05-10","frame":"CY2012Q1"}]}},"PropertyPlantAndEquipmentUsefulLifeMinimum":{"label":"Property, Plant and Equipment, Useful Life, Minimum (Deprecated 2012-01-31)","description":"The minimum useful life of long lived, physical assets used in the normal conduct of business and not intended for resale. Examples include land, buildings, machinery and equipment, and other types of furniture and equipment including, but not limited to, office equipment, furniture and fixtures, and computer equipment and software.","units":{"pure":[{"start":"2011-01-01","end":"2011-12-31","val":3,"accn":"0001193125-12-336167","fy":2011,"fp":"FY","form":"8-K","filed":"2012-08-06","frame":"CY2011"},{"start":"2011-01-01","end":"2011-12-31","val":3,"accn":"0001193125-12-088684","fy":2011,"fp":"FY","form":"10-K","filed":"2012-02-29"}],"Y":[{"start":"2012-01-01","end":"2012-03-31","val":3,"accn":"0001193125-12-225123","fy":2012,"fp":"Q1","form":"10-Q","filed":"2012-05-10","frame":"CY2012Q1"}]}},"ProvisionForLeaseLosses":{"label":"Provision for Lease Losses","description":"Amount of expense related to estimated loss to be realized from lease transactions.","units":{"USD":[{"start":"2011-01-01","end":"2011-03-31","val":900000,"accn":"0001193125-12-346917","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-08-09","frame":"CY2011Q1"}]}},"ReceivablesFromBrokersDealersAndClearingOrganizations":{"label":"Receivables from Brokers-Dealers and Clearing Organizations","description":"Amount receivable from broker-dealers and clearing organizations, including, but not limited to, securities failed-to-deliver, certain deposits for securities borrowed, open transactions, good faith and margin deposits, commissions and floor brokerage receivables.","units":{"USD":[{"end":"2009-12-31","val":500143000,"accn":"0001193125-11-052082","fy":2010,"fp":"FY","form":"10-K","filed":"2011-03-01","frame":"CY2009Q4I"},{"end":"2009-12-31","val":500143000,"accn":"0001193125-10-254096","fy":2010,"fp":"Q3","form":"10-Q","filed":"2010-11-09"},{"end":"2009-12-31","val":500143000,"accn":"0001193125-10-183256","fy":2010,"fp":"Q2","form":"10-Q","filed":"2010-08-09"},{"end":"2010-06-30","val":771357000,"accn":"0001193125-10-183256","fy":2010,"fp":"Q2","form":"10-Q","filed":"2010-08-09","frame":"CY2010Q2I"},{"end":"2010-09-30","val":527614000,"accn":"0001193125-10-254096","fy":2010,"fp":"Q3","form":"10-Q","filed":"2010-11-09","frame":"CY2010Q3I"},{"end":"2010-12-31","val":476159000,"accn":"0001193125-12-336167","fy":2011,"fp":"FY","form":"8-K","filed":"2012-08-06","frame":"CY2010Q4I"},{"end":"2010-12-31","val":476159000,"accn":"0001193125-12-088684","fy":2011,"fp":"FY","form":"10-K","filed":"2012-02-29"},{"end":"2010-12-31","val":476159000,"accn":"0001193125-11-304504","fy":2011,"fp":"Q3","form":"10-Q","filed":"2011-11-09"},{"end":"2010-12-31","val":476159000,"accn":"0001193125-11-216460","fy":2011,"fp":"Q2","form":"10-Q","filed":"2011-08-09"},{"end":"2010-12-31","val":476159000,"accn":"0001193125-11-134211","fy":2011,"fp":"Q1","form":"10-Q","filed":"2011-05-10"},{"end":"2010-12-31","val":476159000,"accn":"0001193125-11-052082","fy":2010,"fp":"FY","form":"10-K","filed":"2011-03-01"},{"end":"2011-03-31","val":776242000,"accn":"0001193125-11-134211","fy":2011,"fp":"Q1","form":"10-Q","filed":"2011-05-10","frame":"CY2011Q1I"},{"end":"2011-06-30","val":683139000,"accn":"0001193125-11-216460","fy":2011,"fp":"Q2","form":"10-Q","filed":"2011-08-09","frame":"CY2011Q2I"},{"end":"2011-09-30","val":656758000,"accn":"0001193125-11-304504","fy":2011,"fp":"Q3","form":"10-Q","filed":"2011-11-09","frame":"CY2011Q3I"},{"end":"2011-12-31","val":547945000,"accn":"0001193125-13-215378","fy":2012,"fp":"FY","form":"8-K","filed":"2013-05-13","frame":"CY2011Q4I"},{"end":"2011-12-31","val":623897000,"accn":"0001193125-13-087636","fy":2012,"fp":"FY","form":"10-K","filed":"2013-03-01"},{"end":"2011-12-31","val":623897000,"accn":"0001193125-12-462994","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-11-09"},{"end":"2011-12-31","val":623897000,"accn":"0001193125-12-346917","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-08-09"},{"end":"2011-12-31","val":623897000,"accn":"0001193125-12-336167","fy":2011,"fp":"FY","form":"8-K","filed":"2012-08-06"},{"end":"2011-12-31","val":623897000,"accn":"0001193125-12-225123","fy":2012,"fp":"Q1","form":"10-Q","filed":"2012-05-10"},{"end":"2011-12-31","val":623897000,"accn":"0001193125-12-088684","fy":2011,"fp":"FY","form":"10-K","filed":"2012-02-29"},{"end":"2012-03-31","val":703697000,"accn":"0001193125-12-225123","fy":2012,"fp":"Q1","form":"10-Q","filed":"2012-05-10","frame":"CY2012Q1I"},{"end":"2012-06-30","val":880080000,"accn":"0001193125-12-346917","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-08-09","frame":"CY2012Q2I"},{"end":"2012-09-30","val":944239000,"accn":"0001193125-12-462994","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-11-09","frame":"CY2012Q3I"},{"end":"2012-12-31","val":868805000,"accn":"0001445305-13-001242","fy":2013,"fp":"Q1","form":"10-Q","filed":"2013-05-09"},{"end":"2012-12-31","val":868805000,"accn":"0001193125-13-215378","fy":2012,"fp":"FY","form":"8-K","filed":"2013-05-13","frame":"CY2012Q4I"},{"end":"2012-12-31","val":1149984000,"accn":"0001193125-13-087636","fy":2012,"fp":"FY","form":"10-K","filed":"2013-03-01"},{"end":"2013-03-31","val":1107202000,"accn":"0001445305-13-001242","fy":2013,"fp":"Q1","form":"10-Q","filed":"2013-05-09","frame":"CY2013Q1I"}]}},"RepaymentsOfLinesOfCredit":{"label":"Repayments of Lines of Credit","description":"Amount of cash outflow for payment of an obligation from a lender, including but not limited to, letter of credit, standby letter of credit and revolving credit arrangements.","units":{"USD":[{"start":"2010-01-01","end":"2010-03-31","val":140000000,"accn":"0001193125-11-134211","fy":2011,"fp":"Q1","form":"10-Q","filed":"2011-05-10","frame":"CY2010Q1"},{"start":"2010-01-01","end":"2010-06-30","val":140000000,"accn":"0001193125-11-216460","fy":2011,"fp":"Q2","form":"10-Q","filed":"2011-08-09"},{"start":"2010-01-01","end":"2010-06-30","val":140000000,"accn":"0001193125-10-183256","fy":2010,"fp":"Q2","form":"10-Q","filed":"2010-08-09"},{"start":"2010-01-01","end":"2010-09-30","val":140000000,"accn":"0001193125-11-304504","fy":2011,"fp":"Q3","form":"10-Q","filed":"2011-11-09"},{"start":"2010-01-01","end":"2010-09-30","val":140000000,"accn":"0001193125-10-254096","fy":2010,"fp":"Q3","form":"10-Q","filed":"2010-11-09"},{"start":"2010-01-01","end":"2010-12-31","val":140000000,"accn":"0001193125-13-215378","fy":2012,"fp":"FY","form":"8-K","filed":"2013-05-13","frame":"CY2010"},{"start":"2010-01-01","end":"2010-12-31","val":140000000,"accn":"0001193125-13-087636","fy":2012,"fp":"FY","form":"10-K","filed":"2013-03-01"},{"start":"2010-01-01","end":"2010-12-31","val":140000000,"accn":"0001193125-12-336167","fy":2011,"fp":"FY","form":"8-K","filed":"2012-08-06"},{"start":"2010-01-01","end":"2010-12-31","val":140000000,"accn":"0001193125-12-088684","fy":2011,"fp":"FY","form":"10-K","filed":"2012-02-29"},{"start":"2010-01-01","end":"2010-12-31","val":140000000,"accn":"0001193125-11-052082","fy":2010,"fp":"FY","form":"10-K","filed":"2011-03-01"}]}},"RepaymentsOfLongTermLinesOfCredit":{"label":"Repayments of Long-term Lines of Credit","description":"The cash outflow for the settlement of obligation drawn from a contractual arrangement with the lender, including letter of credit, standby letter of credit and revolving credit arrangements, under which borrowings can be made up to a specific amount at any point in time with maturities due beyond one year or the operating cycle, if longer.","units":{"USD":[{"start":"2012-01-01","end":"2012-09-30","val":200000000,"accn":"0001193125-12-462994","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-11-09"}]}},"RepurchaseAgreementsInterestExpenseAmount":{"label":"Repurchase Agreements, Interest Expense Amount","description":"This is the amount of interest expense incurred during the reporting period as a result of repurchase agreements.","units":{"USD":[{"start":"2009-01-01","end":"2009-12-31","val":3000000,"accn":"0001193125-12-336167","fy":2011,"fp":"FY","form":"8-K","filed":"2012-08-06","frame":"CY2009"},{"start":"2009-01-01","end":"2009-12-31","val":3000000,"accn":"0001193125-12-088684","fy":2011,"fp":"FY","form":"10-K","filed":"2012-02-29"},{"start":"2010-04-01","end":"2010-06-30","val":500000,"accn":"0001193125-11-216460","fy":2011,"fp":"Q2","form":"10-Q","filed":"2011-08-09","frame":"CY2010Q2"},{"start":"2010-01-01","end":"2010-09-30","val":500000,"accn":"0001193125-11-304504","fy":2011,"fp":"Q3","form":"10-Q","filed":"2011-11-09"},{"start":"2010-01-01","end":"2010-12-31","val":500000,"accn":"0001193125-12-336167","fy":2011,"fp":"FY","form":"8-K","filed":"2012-08-06","frame":"CY2010"},{"start":"2010-01-01","end":"2010-12-31","val":500000,"accn":"0001193125-12-088684","fy":2011,"fp":"FY","form":"10-K","filed":"2012-02-29"}]}},"RestrictedCashAndCashEquivalents":{"label":"Restricted Cash and Cash Equivalents","description":"Amount of cash and cash equivalents restricted as to withdrawal or usage. Cash includes, but is not limited to, currency on hand, demand deposits with banks or financial institutions, and other accounts with general characteristics of demand deposits. Cash equivalents include, but are not limited to, 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.","units":{"USD":[{"end":"2012-06-30","val":183556000,"accn":"0001193125-12-346917","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-08-09","frame":"CY2012Q2I"},{"end":"2012-09-30","val":201619000,"accn":"0001193125-12-462994","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-11-09","frame":"CY2012Q3I"},{"end":"2012-12-31","val":182280000,"accn":"0001193125-13-215378","fy":2012,"fp":"FY","form":"8-K","filed":"2013-05-13","frame":"CY2012Q4I"},{"end":"2012-12-31","val":182280000,"accn":"0001193125-13-087636","fy":2012,"fp":"FY","form":"10-K","filed":"2013-03-01"}]}},"RestrictedCashAndCashEquivalentsAtCarryingValue":{"label":"Restricted Cash and Cash Equivalents, Current","description":"Amount of cash and cash equivalents restricted as to withdrawal or usage, classified as current. Cash includes, but is not limited to, currency on hand, demand deposits with banks or financial institutions, and other accounts with general characteristics of demand deposits. Cash equivalents include, but are not limited to, 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.","units":{"USD":[{"end":"2011-12-31","val":11010000,"accn":"0001193125-13-215378","fy":2012,"fp":"FY","form":"8-K","filed":"2013-05-13","frame":"CY2011Q4I"},{"end":"2011-12-31","val":11010000,"accn":"0001193125-13-087636","fy":2012,"fp":"FY","form":"10-K","filed":"2013-03-01"},{"end":"2011-12-31","val":11010000,"accn":"0001193125-12-462994","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-11-09"},{"end":"2011-12-31","val":11010000,"accn":"0001193125-12-346917","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-08-09"},{"end":"2012-06-30","val":188091000,"accn":"0001193125-12-346917","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-08-09","frame":"CY2012Q2I"},{"end":"2012-09-30","val":137519000,"accn":"0001193125-12-462994","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-11-09","frame":"CY2012Q3I"},{"end":"2012-12-31","val":163992000,"accn":"0001193125-13-215378","fy":2012,"fp":"FY","form":"8-K","filed":"2013-05-13","frame":"CY2012Q4I"},{"end":"2012-12-31","val":163992000,"accn":"0001193125-13-087636","fy":2012,"fp":"FY","form":"10-K","filed":"2013-03-01"}]}},"RestrictedCashAndInvestmentsCurrent":{"label":"Restricted Cash and Investments, Current","description":"The current cash, cash equivalents and investments that are restricted as to withdrawal or usage. Restrictions may include legally restricted deposits held as compensating balances against short-term borrowing arrangements, contracts entered into with others, or entity statements of intention with regard to particular deposits; however, time deposits and short-term certificates of deposit are not generally included in legally restricted deposits. Excludes compensating balance arrangements that are not agreements which legally restrict the use of cash amounts shown on the balance sheet. 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