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Commitments, contingencies, and guarantees Commitments, Contingencies, And Guarantees (Transactions accounted for as secured borrowings) (Details) - USD ($)
$ in Millions
Dec. 31, 2021
Dec. 31, 2020
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]    
Securities lending collateral $ 1,831 $ 1,844
Collateral held under securities lending agreements 1,831 1,844
Maturity Overnight [Member] | Cash    
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]    
Securities lending collateral 931 551
Maturity Overnight [Member] | U.S. Treasury and agency    
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]    
Securities lending collateral 128 148
Maturity Overnight [Member] | Foreign [Member]    
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]    
Securities lending collateral 752 1,032
Maturity Overnight [Member] | Corporate securities    
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]    
Securities lending collateral 12 30
Maturity Overnight [Member] | Mortgage-backed securities    
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]    
Securities lending collateral 1 4
Maturity Overnight [Member] | Equity securities    
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]    
Securities lending collateral $ 7 $ 79