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Non-consolidated variable interest entities - Additional Information (Details) - USD ($) $ in Millions | Dec. 31, 2022 | Dec. 31, 2021
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Variable Interest Entity [Line Items] |  |
Principal Amount Outstanding on Loans Securitized or Asset-backed Financing Arrangement | $ 114 | $ 144
Variable Interest Entity Not Primary Beneficiary [Member] |  |
Variable Interest Entity [Line Items] |  |
Principal Amount Outstanding on Loans Securitized or Asset-backed Financing Arrangement | $ 7,700 | $ 8,300

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- Definition This is the principal amount outstanding for securitized loans only (across all types of loans). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=121570589&loc=d3e107314-111719 + Details
Name: | us-gaap_PrincipalAmountOutstandingOnLoansSecuritized
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_VariableInterestEntityLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | srt_ConsolidatedEntitiesAxis=us-gaap_VariableInterestEntityNotPrimaryBeneficiaryMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |