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Commitments, contingencies, and guarantees Commitments, Contingencies, And Guarantees (Transactions accounted for as secured borrowings) (Details) - USD ($)
$ in Millions
Dec. 31, 2024
Dec. 31, 2023
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]    
Securities lending collateral $ 1,445 $ 1,299
Collateral held under securities lending agreements 1,445 1,299
Repurchase Agreements [Member]    
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]    
Secured Borrowings, Gross, Difference, Amount 159 [1] 91
Maturity Overnight [Member] | Cash    
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]    
Securities lending collateral 557 555
Maturity Overnight [Member] | U.S. Treasury / Agency    
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]    
Securities lending collateral 145 33
Maturity Overnight [Member] | Foreign [Member]    
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]    
Securities lending collateral 663 621
Maturity Overnight [Member] | Corporate securities    
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]    
Securities lending collateral 49 57
Maturity Overnight [Member] | Equity securities    
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]    
Securities lending collateral 28 27
Maturity Overnight [Member] | States, municipalities, and political subdivisions    
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]    
Securities lending collateral $ 3 $ 6
[1] Per the repurchase agreements, the amount of collateral posted is required to exceed the amount of gross liability.