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Commitments, contingencies, and guarantees Commitments, Contingencies, And Guarantees (Collateral pledged under repurchase agreements) (Details) - USD ($) $ in Millions | Jun. 30, 2023 | Dec. 31, 2022
--- | --- | ---
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items] |  |  |
Repurchase agreements |  | $ 1,518 | $ 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 |  | 1,565 | 1,527
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 |  | 2 | 12
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 |  | 102 | 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 |  | 1,461 | 1,414
Repurchase Agreements [Member] |  |  |
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items] |  |  |
Secured Borrowings, Gross, Difference, Amount | [1] | 47 | 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 | 933
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 | 12
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 |  | 1 | 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 |  | 51 | 594
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 |  | 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 |  | 0 | 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 |  | 51 | $ 493
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 |  | 1,513 |
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 |  | 2 |
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 |  | 102 |
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 |  | $ 1,409 |
[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/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//1943274/2147479440/944-210-S99-1 Reference 2: 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 + Details
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- Definition Amount of secured borrowings in excess of (less than) the liability for repurchase agreements and securities lending transactions, before offset, included in offsetting disclosures. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 860 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 7 -Subparagraph (a)(1) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481420/860-30-50-7 + Details
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