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Commitments, contingencies, and guarantees Commitments, contingencies, and guarantees (Collateral pledged under repurchase agreements) (Details) - USD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items] |  |  |
Repurchase agreements (includes VIE balances of $1,009 and nil) |  | $ 2,833 | $ 1,419
Securities Sold under Agreements to Repurchase |  | 2,833 | 1,419
Asset Pledged as Collateral without Right |  |  |
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items] |  |  |
Assets pledged under repurchase agreements |  | 2,924 | 1,527
Cash | Asset Pledged as Collateral without Right |  |  |
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items] |  |  |
Assets pledged under repurchase agreements |  | 34 | 12
Non-US [Member] | Asset Pledged as Collateral without Right |  |  |
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items] |  |  |
Assets pledged under repurchase agreements |  | 1,355 | 0
U.S. Treasury / Agency | Asset Pledged as Collateral without Right |  |  |
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items] |  |  |
Assets pledged under repurchase agreements |  | 105 | 101
Mortgage-backed securities | Asset Pledged as Collateral without Right |  |  |
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items] |  |  |
Assets pledged under repurchase agreements |  | 1,430 | 1,414
Repurchase Agreements [Member] |  |  |
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items] |  |  |
Secured Borrowings, Gross, Difference, Amount | [1] | 91 | 108
Maturity Less than 30 Days [Member] | Asset Pledged as Collateral without Right |  |  |
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items] |  |  |
Assets pledged under repurchase agreements |  | 1,355 | 933
Maturity Less than 30 Days [Member] | Cash | Asset Pledged as Collateral without Right |  |  |
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items] |  |  |
Assets pledged under repurchase agreements |  | 0 | 12
Maturity Less than 30 Days [Member] | Non-US [Member] | Asset Pledged as Collateral without Right |  |  |
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items] |  |  |
Assets pledged under repurchase agreements |  | 1,355 | 0
Maturity Less than 30 Days [Member] | U.S. Treasury / Agency | Asset Pledged as Collateral without Right |  |  |
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items] |  |  |
Assets pledged under repurchase agreements |  | 0 | 0
Maturity Less than 30 Days [Member] | Mortgage-backed securities | Asset Pledged as Collateral without Right |  |  |
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items] |  |  |
Assets pledged under repurchase agreements |  | 0 | 921
Maturity 30 to 90 Days [Member] | Asset Pledged as Collateral without Right |  |  |
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items] |  |  |
Assets pledged under repurchase agreements |  | 1,051 | 594
Maturity 30 to 90 Days [Member] | Cash | Asset Pledged as Collateral without Right |  |  |
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items] |  |  |
Assets pledged under repurchase agreements |  | 33 | 0
Maturity 30 to 90 Days [Member] | Non-US [Member] | Asset Pledged as Collateral without Right |  |  |
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 | Asset Pledged as Collateral without Right |  |  |
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items] |  |  |
Assets pledged under repurchase agreements |  | 105 | 101
Maturity 30 to 90 Days [Member] | Mortgage-backed securities | Asset Pledged as Collateral without Right |  |  |
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items] |  |  |
Assets pledged under repurchase agreements |  | 913 | $ 493
Maturity Greater than 90 Days [Member] |  |  |
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items] |  |  |
Assets pledged under repurchase agreements |  | 518 |
Maturity Greater than 90 Days [Member] | Cash | Asset Pledged as Collateral without Right |  |  |
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items] |  |  |
Assets pledged under repurchase agreements |  | 1 |
Maturity Greater than 90 Days [Member] | Non-US [Member] | Asset Pledged as Collateral without Right |  |  |
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items] |  |  |
Assets pledged under repurchase agreements |  | 0 |
Maturity Greater than 90 Days [Member] | U.S. Treasury / Agency | Asset Pledged as Collateral without Right |  |  |
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items] |  |  |
Assets pledged under repurchase agreements |  | 0 |
Maturity Greater than 90 Days [Member] | Mortgage-backed securities | Asset Pledged as Collateral without Right |  |  |
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items] |  |  |
Assets pledged under repurchase agreements |  | $ 517 |
[1] | Per the repurchase agreements, the amount of collateral posted is required to exceed the amount of gross liability.

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