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Guarantee Arrangements, Pledged Assets and Collateral Guarantee Arrangements, Pledged Assets and Collateral, Collateral Pledged and Remaining Contractual Maturity of Repurchase Agreements Accounted for as Secured Borrowings (Details) - U.S. Treasury, U.S. Government agencies and sponsored entities [Member]
$ in Millions
Jun. 30, 2015
USD ($)
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]  
Collateral pledged and remaining contractual maturity of repurchase agreements accounted for as secured borrowings $ 8,916
Maturity Overnight and Continuous [Member]  
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]  
Collateral pledged and remaining contractual maturity of repurchase agreements accounted for as secured borrowings 1,243
Maturity up to 30 Days [Member]  
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]  
Collateral pledged and remaining contractual maturity of repurchase agreements accounted for as secured borrowings 4,453
Maturity 30 to 90 Days [Member]  
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]  
Collateral pledged and remaining contractual maturity of repurchase agreements accounted for as secured borrowings 49
Maturity Greater than 90 Days [Member]  
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]  
Collateral pledged and remaining contractual maturity of repurchase agreements accounted for as secured borrowings $ 3,171