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Commitments, contingencies, and guarantees Commitments, Contingencies, And Guarantees (Collateral pledged under repurchase agreements) (Details) - USD ($) $ in Millions | Sep. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items] |  |  |
Assets pledged under repurchase agreements |  | $ 1,425 | $ 1,462
Repurchase agreements |  | 1,406 | 1,405
Cash [Member] |  |  |
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items] |  |  |
Assets pledged under repurchase agreements |  | 0 | 4
U.S. Treasury / Agency |  |  |
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items] |  |  |
Assets pledged under repurchase agreements |  | 104 | 106
Mortgage-backed securities |  |  |
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items] |  |  |
Assets pledged under repurchase agreements |  | 1,321 | 1,352
Repurchase Agreements [Member] |  |  |
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items] |  |  |
Secured Borrowings, Gross, Difference, Amount | [1] | 19 | 57
Maturity 30 to 90 Days [Member] |  |  |
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items] |  |  |
Assets pledged under repurchase agreements |  | 475 | 481
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 |  | 475 | 481
Maturity Greater than 90 Days [Member] |  |  |
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items] |  |  |
Assets pledged under repurchase agreements |  | 950 | 981
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 | 4
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 |  | 104 | 106
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 |  | $ 846 | $ 871
[1] | Per the repurchase agreements, the amount of collateral posted is required to exceed the amount of gross liability.

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- Definition The carrying amount as of the date of the latest financial statement presented of securities which are owned but transferred to serve as collateral for repurchase agreements, and for which the transferee does not have the right by contract or custom to sell or re-pledge them to an unrelated party. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 30 -Section 50 -Paragraph 1A -Subparagraph (b)(1)(i) -URI http://asc.fasb.org/extlink&oid=109249958&loc=SL6224234-111729 + 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 -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 30 -Section 50 -Paragraph 7 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=109249958&loc=SL34722452-111729 + Details
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- Definition Carrying value, as of the balance sheet date, of securities sold under agreements to repurchase where the transferor maintains effective control over the assets, accounting for them as secured debt. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 30 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=109249958&loc=SL34722452-111729 + Details
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