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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
Sep. 30, 2020
Dec. 31, 2019
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 $ 6,320 $ 2,401
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 923 2,401
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 5,096 0
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 301 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 0
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