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Commitments, contingencies, and guarantees Commitments, Contingencies, And Guarantees (Collateral pledged under repurchase agreements) (Details) - USD ($)
$ in Millions
Sep. 30, 2020
Dec. 31, 2019
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]    
Assets pledged under repurchase agreements $ 1,433 $ 1,464
Repurchase agreements 1,413 1,416
Cash [Member]    
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]    
Assets pledged under repurchase agreements 4 2
U.S. Treasury / Agency    
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]    
Assets pledged under repurchase agreements 106 107
Mortgage-backed securities    
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]    
Assets pledged under repurchase agreements 1,323 1,355
Repurchase Agreements [Member]    
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]    
Secured Borrowings, Gross, Difference, Amount [1] 20 48
Maturity Less than 30 Days [Member]    
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]    
Assets pledged under repurchase agreements 398 508
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 4 2
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 4 107
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 390 399
Maturity 30 to 90 Days [Member]    
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]    
Assets pledged under repurchase agreements 462 476
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 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 462 476
Maturity Greater than 90 Days [Member]    
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]    
Assets pledged under repurchase agreements 573 480
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 0
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 $ 471 $ 480
[1] Per the repurchase agreements, the amount of collateral posted is required to exceed the amount of gross liability.