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Commitments, contingencies, and guarantees Commitments, Contingencies, And Guarantees (Collateral pledged under repurchase agreements) (Details) - USD ($)
$ in Millions
Mar. 31, 2022
Dec. 31, 2021
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]    
Assets pledged under repurchase agreements $ 1,443 $ 1,420
Repurchase agreements 1,406 1,406
Cash [Member]    
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]    
Assets pledged under repurchase agreements 43 29
U.S. Treasury / Agency    
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]    
Assets pledged under repurchase agreements 102 103
Mortgage-backed securities    
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]    
Assets pledged under repurchase agreements 1,298 1,288
Repurchase Agreements [Member]    
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]    
Secured Borrowings, Gross, Difference, Amount [1] 37 14
Maturity Less than 30 Days [Member]    
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]    
Assets pledged under repurchase agreements 401  
Maturity Less than 30 Days [Member] | Cash [Member]    
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]    
Assets pledged under repurchase agreements 43  
Maturity Less than 30 Days [Member] | U.S. Treasury / Agency    
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]    
Assets pledged under repurchase agreements 0  
Maturity Less than 30 Days [Member] | Mortgage-backed securities    
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]    
Assets pledged under repurchase agreements 358  
Maturity 30 to 90 Days [Member]    
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]    
Assets pledged under repurchase agreements 466 103
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 0 103
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 466 0
Maturity Greater than 90 Days [Member]    
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]    
Assets pledged under repurchase agreements 576 1,317
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 0 29
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 102 0
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 $ 474 $ 1,288
[1] Per the repurchase agreements, the amount of collateral posted is required to exceed the amount of gross liability.