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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) - U.S. Treasury, U.S. Government agencies and sponsored entities [Member] - USD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
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 $ 2,401 $ 3,333
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 2,401 1,773
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 0 369
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
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 0 191
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 $ 1,000