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Derivatives (Credit Derivatives) (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2024 | Dec. 31, 2023
Credit Derivatives [Line Items] |  |
Estimated Fair Value of Credit Default Swaps | $ 264 | $ 228
Maximum Amount of Future Payments under Credit Default Swaps | $ 13,901 | $ 12,468
Weighted Average Years to Maturity | 4 years | 4 years 6 months
Aaa/Aa/A |  |
Credit Derivatives [Line Items] |  |
Estimated Fair Value of Credit Default Swaps | $ 92 | $ 82
Maximum Amount of Future Payments under Credit Default Swaps | $ 4,426 | $ 3,980
Weighted Average Years to Maturity | 2 years 7 months 6 days | 2 years 7 months 6 days
Aaa/Aa/A | Single name credit default swaps (3) |  |
Credit Derivatives [Line Items] |  |
Estimated Fair Value of Credit Default Swaps | $ 1 | $ 2
Maximum Amount of Future Payments under Credit Default Swaps | $ 140 | $ 150
Weighted Average Years to Maturity | 1 year 4 months 24 days | 1 year 7 months 6 days
Aaa/Aa/A | Credit default swaps referencing indices |  |
Credit Derivatives [Line Items] |  |
Estimated Fair Value of Credit Default Swaps | $ 91 | $ 80
Maximum Amount of Future Payments under Credit Default Swaps | $ 4,286 | $ 3,830
Weighted Average Years to Maturity | 2 years 8 months 12 days | 2 years 8 months 12 days
Baa [Member] |  |
Credit Derivatives [Line Items] |  |
Estimated Fair Value of Credit Default Swaps | $ 170 | $ 146
Maximum Amount of Future Payments under Credit Default Swaps | $ 9,274 | $ 8,287
Weighted Average Years to Maturity | 4 years 8 months 12 days | 5 years 3 months 18 days
Baa [Member] | Single name credit default swaps (3) |  |
Credit Derivatives [Line Items] |  |
Estimated Fair Value of Credit Default Swaps | $ 1 | $ 1
Maximum Amount of Future Payments under Credit Default Swaps | $ 99 | $ 99
Weighted Average Years to Maturity | 1 year 9 months 18 days | 2 years 1 month 6 days
Baa [Member] | Credit default swaps referencing indices |  |
Credit Derivatives [Line Items] |  |
Estimated Fair Value of Credit Default Swaps | $ 169 | $ 145
Maximum Amount of Future Payments under Credit Default Swaps | $ 9,175 | $ 8,188
Weighted Average Years to Maturity | 4 years 8 months 12 days | 5 years 4 months 24 days
B |  |
Credit Derivatives [Line Items] |  |
Estimated Fair Value of Credit Default Swaps | $ 2 | $ 2
Maximum Amount of Future Payments under Credit Default Swaps | $ 129 | $ 129
Weighted Average Years to Maturity | 4 years 8 months 12 days | 5 years
B | Credit default swaps referencing indices |  |
Credit Derivatives [Line Items] |  |
Estimated Fair Value of Credit Default Swaps | $ 2 | $ 2
Maximum Amount of Future Payments under Credit Default Swaps | $ 129 | $ 129
Weighted Average Years to Maturity | 4 years 8 months 12 days | 5 years
Caa |  |
Credit Derivatives [Line Items] |  |
Estimated Fair Value of Credit Default Swaps | $ (2) | $ (4)
Maximum Amount of Future Payments under Credit Default Swaps | $ 30 | $ 30
Weighted Average Years to Maturity | 2 years 2 months 12 days | 2 years 6 months
Caa | Credit default swaps referencing indices |  |
Credit Derivatives [Line Items] |  |
Estimated Fair Value of Credit Default Swaps |  | $ (4)
Estimated Fair Value of Credit Default Swaps | $ (2) |
Maximum Amount of Future Payments under Credit Default Swaps | $ 30 | $ 30
Weighted Average Years to Maturity | 2 years 2 months 12 days | 2 years 6 months
Ba |  |
Credit Derivatives [Line Items] |  |
Estimated Fair Value of Credit Default Swaps | $ 2 | $ 2
Maximum Amount of Future Payments under Credit Default Swaps | $ 42 | $ 42
Weighted Average Years to Maturity | 2 years 4 months 24 days | 2 years 7 months 6 days
Ba | Single name credit default swaps (3) |  |
Credit Derivatives [Line Items] |  |
Estimated Fair Value of Credit Default Swaps | $ 0 | $ 0
Maximum Amount of Future Payments under Credit Default Swaps | $ 17 | $ 17
Weighted Average Years to Maturity | 1 year 10 months 24 days | 2 years 1 month 6 days
Ba | Credit default swaps referencing indices |  |
Credit Derivatives [Line Items] |  |
Estimated Fair Value of Credit Default Swaps | $ 2 | $ 2
Maximum Amount of Future Payments under Credit Default Swaps | $ 25 | $ 25
Weighted Average Years to Maturity | 2 years 8 months 12 days | 3 years

X
- 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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Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- 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 Fair value 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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Period Type: | instant

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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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X
- Definition Average remaining period until maturity of the derivative contract, 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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- Details
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- Details
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