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Commitments, contingencies, and guarantees Commitments, Contingencies, And Guarantees (Collateral pledged under repurchase agreements) (Details) - USD ($)
$ in Millions
Mar. 31, 2021
Dec. 31, 2020
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]    
Assets pledged under repurchase agreements $ 1,458 $ 1,462
Repurchase agreements 1,405 1,405
Cash [Member]    
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]    
Assets pledged under repurchase agreements 10 4
U.S. Treasury / Agency    
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]    
Assets pledged under repurchase agreements 106 106
Mortgage-backed securities    
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]    
Assets pledged under repurchase agreements 1,342 1,352
Repurchase Agreements [Member]    
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]    
Secured Borrowings, Gross, Difference, Amount [1] 53 57
Maturity 30 to 90 Days [Member]    
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]    
Assets pledged under repurchase agreements 102 481
Maturity 30 to 90 Days [Member] | Cash [Member]    
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]    
Assets pledged under repurchase agreements 0 0
Maturity 30 to 90 Days [Member] | U.S. Treasury / Agency    
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]    
Assets pledged under repurchase agreements 102 0
Maturity 30 to 90 Days [Member] | Mortgage-backed securities    
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]    
Assets pledged under repurchase agreements 0 481
Maturity Greater than 90 Days [Member]    
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]    
Assets pledged under repurchase agreements 1,356 981
Maturity Greater than 90 Days [Member] | Cash [Member]    
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]    
Assets pledged under repurchase agreements 10 4
Maturity Greater than 90 Days [Member] | U.S. Treasury / Agency    
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]    
Assets pledged under repurchase agreements 4 106
Maturity Greater than 90 Days [Member] | Mortgage-backed securities    
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]    
Assets pledged under repurchase agreements $ 1,342 $ 871
[1] Per the repurchase agreements, the amount of collateral posted is required to exceed the amount of gross liability.