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Derivatives (Credit Derivatives) (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
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Mar. 31, 2023 | Dec. 31, 2022
Credit Derivatives [Line Items] |  |
Estimated Fair Value of Credit Default Swaps | $ 22 | $ 16
Maximum Amount of Future Payments under Credit Default Swaps | $ 1,760 | $ 1,757
Weighted Average Years to Maturity (2) | 4 years 1 month 6 days | 4 years 1 month 6 days
Credit default swaps | Aaa/Aa/A |  |
Credit Derivatives [Line Items] |  |
Estimated Fair Value of Credit Default Swaps | $ 8 | $ 7
Maximum Amount of Future Payments under Credit Default Swaps | $ 544 | $ 544
Weighted Average Years to Maturity (2) | 2 years | 2 years 2 months 12 days
Credit default swaps | Baa |  |
Credit Derivatives [Line Items] |  |
Estimated Fair Value of Credit Default Swaps | $ 13 | $ 8
Maximum Amount of Future Payments under Credit Default Swaps | $ 1,188 | $ 1,185
Weighted Average Years to Maturity (2) | 5 years 1 month 6 days | 5 years
Credit default swaps | Ba |  |
Credit Derivatives [Line Items] |  |
Estimated Fair Value of Credit Default Swaps | $ 2 | $ 2
Maximum Amount of Future Payments under Credit Default Swaps | $ 24 | $ 24
Weighted Average Years to Maturity (2) | 3 years 8 months 12 days | 4 years
Credit default swaps | Caa and Lower |  |
Credit Derivatives [Line Items] |  |
Estimated Fair Value of Credit Default Swaps | $ (1) | $ (1)
Maximum Amount of Future Payments under Credit Default Swaps | $ 4 | $ 4
Weighted Average Years to Maturity (2) | 2 years 8 months 12 days | 3 years

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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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Balance Type: | credit
Period Type: | instant

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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 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 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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- Details
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