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Contracts Accounted for as Credit Derivatives - Narrative (Details) | 12 Months Ended
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Dec. 31, 2022 | Dec. 31, 2021
Derivative Instruments and Hedging Activities Disclosure [Abstract] |  |
Estimated remaining weighted average life of credit derivatives (in years) | 12 years 9 months 18 days | 13 years 2 months 12 days

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- Definition Average period covered by credit risk derivative contracts, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4K -Subparagraph (a)(1) -URI https://asc.fasb.org/extlink&oid=125515794&loc=SL5708775-113959 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration