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Commitments, contingencies, and guarantees Commitments, Contingencies, And Guarantees (Collateral pledged under repurchase agreements) (Details) - USD ($) $ in Millions | Sep. 30, 2025 | Dec. 31, 2024
--- | --- | ---
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items] |  |  |
Repurchase agreements |  | $ 3,360 | $ 2,731
Asset Pledged as Collateral without Right |  |  |
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items] |  |  |
Assets pledged under repurchase agreements |  | 3,580 | 2,890
Cash [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 | 21
U.S. and local government securities | Asset Pledged as Collateral without Right |  |  |
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items] |  |  |
Assets pledged under repurchase agreements |  | 104 | 104
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 |  | 1,931 | 1,378
Repurchase Agreements [Member] |  |  |
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items] |  |  |
Secured Borrowings, Gross, Difference, Amount | [1] | 220 | 159
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 |  | 1,544 | 1,387
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 |  | 2,513 | 1,387
Maturity Less than 30 Days [Member] | Cash [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 Less than 30 Days [Member] | U.S. and local government 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 | 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 |  | 969 | 0
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 |  | 1,544 | 1,387
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 |  | 1,049 | 473
Maturity 30 to 90 Days [Member] | Cash [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 | 19
Maturity 30 to 90 Days [Member] | U.S. and local government securities | Asset Pledged as Collateral without Right |  |  |
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items] |  |  |
Assets pledged under repurchase agreements |  | 104 | 0
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 |  | 944 | 454
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 Greater than 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 |  | 18 | 1,030
Maturity Greater than 90 Days [Member] | Cash [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 | 2
Maturity Greater than 90 Days [Member] | U.S. and local government 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 | 104
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 |  | 18 | 924
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 | $ 0
[1] | Per the repurchase agreements, the amount of collateral posted is required to exceed the amount of gross liability.

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- Definition Amount, after allowance for credit loss, of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), investment in debt security measured at amortized cost (held-to-maturity), and investment in debt security measured at fair value with change in fair value recognized in net income (trading). + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 944 -SubTopic 80 -Name Accounting Standards Codification -Section 55 -Paragraph 14 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480078/944-80-55-14 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Topic 944 -SubTopic 80 -Name Accounting Standards Codification -Section 55 -Paragraph 9 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480078/944-80-55-9 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 944 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(1)(a)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478777/944-210-S99-1 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481830/320-10-45-1 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Topic 944 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(1)(6)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478777/944-210-S99-1 + Details
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