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Derivatives - Credit Risk Assumed through Credit Derivatives (Details) - USD ($) $ in Millions | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2023 | Dec. 31, 2022
Credit Derivatives [Line Items] |  |
Derivative, Notional Amount | $ 17,166 | $ 10,755
Fair Value | (15) | 47
Derivative, Collateral, Right to Reclaim Cash | 63 | 1
Securities Received as Collateral | 0 | 1
Collateral Pledged |  |
Credit Derivatives [Line Items] |  |
Derivative, Collateral, Right to Reclaim Cash | 16 | 16
Asset Pledged as Collateral [Member] |  |
Credit Derivatives [Line Items] |  |
Derivative, Collateral, Right to Reclaim Securities | 2 | 8
Credit derivatives |  |
Credit Derivatives [Line Items] |  |
Derivative, Notional Amount | 103 | 103
Fair Value | (3) | (3)
Derivative, Nominal Value, Amount Offset Against Collateral, Net | 103 | 103
Offsetting Fair Value | 3 | 3
Credit derivatives | Basket credit default swaps | Standard & Poor's, AAA Rating [Member] | Investment grade risk exposure |  |
Credit Derivatives [Line Items] |  |
Derivative, Notional Amount | 100 | 100
Fair Value | $ (1) | $ (1)
Weighted Average Years to Maturity | 5 years | 6 years
Derivative, Nominal Value, Amount Offset Against Collateral, Net | $ 100 | $ 100
Offsetting Fair Value | 1 | 1
Credit derivatives | Basket credit default swaps | Standard & Poor's, B- Rating | Below investment grade risk exposure |  |
Credit Derivatives [Line Items] |  |
Derivative, Notional Amount |  | 3
Fair Value |  | $ (2)
Average Term of Credit Risk Derivatives Less than 1 Year |  | Less than 1 year
Derivative, Nominal Value, Amount Offset Against Collateral, Net |  | $ 3
Offsetting Fair Value |  | $ 2
Credit derivatives | Basket credit default swaps | Standard & Poor's, CCC+ Rating | Below investment grade risk exposure |  |
Credit Derivatives [Line Items] |  |
Derivative, Notional Amount | 3 |
Fair Value | $ (2) |
Average Term of Credit Risk Derivatives Less than 1 Year | Less than 1 year |
Derivative, Nominal Value, Amount Offset Against Collateral, Net | $ 3 |
Offsetting Fair Value | $ 2 |

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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 -Name Accounting Standards Codification -Section 50 -Paragraph 4K -Subparagraph (a)(1) -SubTopic 10 -Topic 815 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480434/815-10-50-4K + Details
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- Definition Amount of right to receive cash collateral under master netting arrangements that have not been offset against derivative liabilities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 55 -Paragraph 13 -SubTopic 20 -Topic 210 -Publisher FASB -URI https://asc.fasb.org//1943274/2147483444/210-20-55-13 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Topic 210 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 20 -Publisher FASB -URI https://asc.fasb.org//1943274/2147483444/210-20-55-20 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 210 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (d)(2) -Publisher FASB -URI https://asc.fasb.org//1943274/2147483466/210-20-50-3 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 8 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480434/815-10-50-8 + Details
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