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Derivative Instruments (Credit Derivatives) (Details) - USD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Derivative [Line Items] |  |
Credit Derivative, Maximum Exposure, Undiscounted | $ 3,446 | $ 6,027
Credit Risk Derivatives, at Fair Value, Asset Net (Liability) | 64 | (31)
Single Name |  |
Derivative [Line Items] |  |
Credit Derivative, Maximum Exposure, Undiscounted | 0 | 0
Credit Risk Derivatives, at Fair Value, Asset Net (Liability) | 0 | 0
Credit Default Index |  |
Derivative [Line Items] |  |
Credit Derivative, Maximum Exposure, Undiscounted | 3,446 | 6,027
Credit Risk Derivatives, at Fair Value, Asset Net (Liability) | $ 64 | (31)
Credit Index Product |  |
Derivative [Line Items] |  |
Credit Derivatives Written Max Length Of Maturities | 24 years |
NAIC 1 |  |
Derivative [Line Items] |  |
Credit Derivative, Maximum Exposure, Undiscounted | $ 0 | 48
Credit Risk Derivatives, at Fair Value, Asset Net (Liability) | 0 | 0
NAIC 1 | Single Name |  |
Derivative [Line Items] |  |
Credit Derivative, Maximum Exposure, Undiscounted | 0 | 0
Credit Risk Derivatives, at Fair Value, Asset Net (Liability) | 0 | 0
NAIC 1 | Credit Default Index |  |
Derivative [Line Items] |  |
Credit Derivative, Maximum Exposure, Undiscounted | 0 | 48
Credit Risk Derivatives, at Fair Value, Asset Net (Liability) | 0 | 0
NAIC 2 |  |
Derivative [Line Items] |  |
Credit Derivative, Maximum Exposure, Undiscounted | 0 | 0
Credit Risk Derivatives, at Fair Value, Asset Net (Liability) | 0 | 0
NAIC 2 | Single Name |  |
Derivative [Line Items] |  |
Credit Derivative, Maximum Exposure, Undiscounted | 0 | 0
Credit Risk Derivatives, at Fair Value, Asset Net (Liability) | 0 | 0
NAIC 2 | Credit Default Index |  |
Derivative [Line Items] |  |
Credit Derivative, Maximum Exposure, Undiscounted | 0 | 0
Credit Risk Derivatives, at Fair Value, Asset Net (Liability) | 0 | 0
NAIC 3 |  |
Derivative [Line Items] |  |
Credit Derivative, Maximum Exposure, Undiscounted | 2,723 | 5,197
Credit Risk Derivatives, at Fair Value, Asset Net (Liability) | 19 | (46)
NAIC 3 | Single Name |  |
Derivative [Line Items] |  |
Credit Derivative, Maximum Exposure, Undiscounted | 0 | 0
Credit Risk Derivatives, at Fair Value, Asset Net (Liability) | 0 | 0
NAIC 3 | Credit Default Index |  |
Derivative [Line Items] |  |
Credit Derivative, Maximum Exposure, Undiscounted | 2,723 | 5,197
Credit Risk Derivatives, at Fair Value, Asset Net (Liability) | 19 | (46)
NAIC 4 |  |
Derivative [Line Items] |  |
Credit Derivative, Maximum Exposure, Undiscounted | 0 | 0
Credit Risk Derivatives, at Fair Value, Asset Net (Liability) | 0 | 0
NAIC 4 | Single Name |  |
Derivative [Line Items] |  |
Credit Derivative, Maximum Exposure, Undiscounted | 0 | 0
Credit Risk Derivatives, at Fair Value, Asset Net (Liability) | 0 | 0
NAIC 4 | Credit Default Index |  |
Derivative [Line Items] |  |
Credit Derivative, Maximum Exposure, Undiscounted | 0 | 0
Credit Risk Derivatives, at Fair Value, Asset Net (Liability) | 0 | 0
NAIC 5 |  |
Derivative [Line Items] |  |
Credit Derivative, Maximum Exposure, Undiscounted | 89 | 0
Credit Risk Derivatives, at Fair Value, Asset Net (Liability) | 5 | 0
NAIC 5 | Single Name |  |
Derivative [Line Items] |  |
Credit Derivative, Maximum Exposure, Undiscounted | 0 | 0
Credit Risk Derivatives, at Fair Value, Asset Net (Liability) | 0 | 0
NAIC 5 | Credit Default Index |  |
Derivative [Line Items] |  |
Credit Derivative, Maximum Exposure, Undiscounted | 89 | 0
Credit Risk Derivatives, at Fair Value, Asset Net (Liability) | 5 | 0
NAIC 6 |  |
Derivative [Line Items] |  |
Credit Derivative, Maximum Exposure, Undiscounted | 634 | 782
Credit Risk Derivatives, at Fair Value, Asset Net (Liability) | $ 40 | $ 15
us-gaap_CreditDerivativeMaximumExposureUndiscounted percentage | 3.00% | 2.00%
NAIC 6 | Single Name |  |
Derivative [Line Items] |  |
Credit Derivative, Maximum Exposure, Undiscounted | $ 0 | $ 0
Credit Risk Derivatives, at Fair Value, Asset Net (Liability) | 0 | 0
NAIC 6 | Credit Default Index |  |
Derivative [Line Items] |  |
Credit Derivative, Maximum Exposure, Undiscounted | 634 | 782
Credit Risk Derivatives, at Fair Value, Asset Net (Liability) | $ 40 | $ 15

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- Definition Credit Derivative, Maximum Exposure, Undiscounted Pecentage + References No definition available. + Details
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- Definition Maximum potential amount of future undiscounted payments that could be required under the credit derivative, before reduction for potential recoveries under recourse or collateralization provisions. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4K -Subparagraph (b)(1) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480434/815-10-50-4K + Details
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- Definition Fair value of credit risk derivative asset after deduction of credit risk derivative liability. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 50 -Paragraph 4K -Subparagraph (c) -SubTopic 10 -Topic 815 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480434/815-10-50-4K + 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 Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 815 -SubTopic 40 -Name Accounting Standards Codification -Section 50 -Paragraph 5 -Subparagraph (f) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480237/815-40-50-5 + Details
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- Definition Period remaining until the derivative contract matures, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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