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Derivatives - Credit Risk Assumed through Credit Derivatives (Details) - USD ($) $ in Millions | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2022 | Dec. 31, 2021
Credit Derivatives [Line Items] |  |
Derivative, Notional Amount | $ 11,454 | $ 11,224
Fair Value | 86 | (42)
Credit derivatives |  |
Credit Derivatives [Line Items] |  |
Derivative, Notional Amount | 104 | 105
Fair Value | (4) | (2)
Derivative, Nominal Value, Amount Offset Against Collateral, Net | 104 | 105
Offsetting Fair Value | 4 | 2
Credit derivatives | Basket credit default swaps | Standard & Poor's, AAA Rating [Member] | Investment grade risk exposure |  |
Credit Derivatives [Line Items] |  |
Derivative, Notional Amount | 100 | 101
Fair Value | $ (2) | $ 0
Weighted Average Years to Maturity | 6 years | 6 years
Derivative, Nominal Value, Amount Offset Against Collateral, Net | $ 100 | $ 101
Offsetting Fair Value | 2 | 0
Credit derivatives | Basket credit default swaps | Standard & Poor's, CCC Rating [Member] | Below investment grade risk exposure |  |
Credit Derivatives [Line Items] |  |
Derivative, Notional Amount |  | 4
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 |  | $ 4
Offsetting Fair Value |  | $ 2
Credit derivatives | Basket credit default swaps | Standard & Poor's, B Rating | Below investment grade risk exposure |  |
Credit Derivatives [Line Items] |  |
Derivative, Notional Amount | 4 |
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 | $ 4 |
Offsetting Fair Value | $ 2 |

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- Definition Derivative, Nominal Value, Amount Offset Against Collateral, Net + References No definition available. + Details
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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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- 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
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- Definition The net amount as of the balance sheet date of the fair value of derivative assets and derivative liabilities that in accordance with the entity's accounting policy were offset against collateral under a master netting arrangement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 8 -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=125515794&loc=d3e41678-113959 + Details
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- Definition Fair value of the assets less the liabilities of a derivative or group of derivatives. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -URI https://asc.fasb.org/extlink&oid=123594938&loc=d3e13433-108611 + Details
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