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Guarantee Arrangements, Pledged Assets and Repurchase Agreements, Collateral Pledged and Remaining Contractual Maturity of Repurchase Agreements Accounted for as Secured Borrowings (Details) - USD ($)
$ in Millions
Mar. 31, 2018
Dec. 31, 2017
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 $ 4,435 $ 4,721
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 1,543 1,166
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 829 919
Maturity 31 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 423 888
Maturity 91 Days to One Year [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 449 284
Maturity Greater than One Year [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 1,191 1,464
U.S. Treasury, U.S. Government agencies and sponsored entities [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 4,397 4,640
U.S. Treasury, U.S. Government agencies and sponsored entities [Member] | 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 1,543 1,166
U.S. Treasury, U.S. Government agencies and sponsored entities [Member] | 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 791 838
U.S. Treasury, U.S. Government agencies and sponsored entities [Member] | Maturity 31 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 423 888
U.S. Treasury, U.S. Government agencies and sponsored entities [Member] | Maturity 91 Days to One Year [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 449 284
U.S. Treasury, U.S. Government agencies and sponsored entities [Member] | Maturity Greater than One Year [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 1,191 1,464
Foreign debt securities [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 38 81
Foreign debt securities [Member] | 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 0 0
Foreign debt securities [Member] | 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 38 81
Foreign debt securities [Member] | Maturity 31 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 0 0
Foreign debt securities [Member] | Maturity 91 Days to One Year [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 0 0
Foreign debt securities [Member] | Maturity Greater than One Year [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 $ 0 $ 0