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Derivatives - Credit Risk Assumed through Credit Derivatives (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2022 | Dec. 31, 2021
Credit Derivatives [Line Items] |  |
Derivative, Notional Amount | $ 10,755 | $ 11,224
Fair Value | 47 | (42)
Asset Pledged as Collateral |  |
Credit Derivatives [Line Items] |  |
Derivative Liability, Subject to Master Netting Arrangement, Collateral, Right to Reclaim Security Not Offset | 8 | 48
Asset Pledged as Collateral | Over the Counter [Member] |  |
Credit Derivatives [Line Items] |  |
Derivative Liability, Subject to Master Netting Arrangement, Collateral, Right to Reclaim Security Not Offset | 57 | 82
Credit derivatives |  |
Credit Derivatives [Line Items] |  |
Derivative, Notional Amount | 103 | 105
Fair Value | (3) | (2)
Offsetting Notional Amount | 103 | 105
Offsetting Fair Value | 3 | 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 | $ (1) | $ 0
Weighted Average Years to Maturity | 6 years | 6 years
Offsetting Notional Amount | $ 100 | $ 101
Offsetting Fair Value | 1 | 0
Credit derivatives | Basket credit default swaps | CCC | 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
Offsetting Notional Amount |  | $ 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 | 3 |
Fair Value | $ (2) |
Average Term of Credit Risk Derivatives Less than 1 Year | Less than 1 year |
Offsetting Notional Amount | $ 3 |
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 Amount of right to receive securities collateral under master netting arrangements that have not been offset against derivative liabilities. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (d)(2) -URI https://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 20 -URI https://asc.fasb.org/extlink&oid=99393222&loc=SL20226038-175313 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 13 -URI https://asc.fasb.org/extlink&oid=99393222&loc=SL20226016-175313 + 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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