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Derivatives (Credit Derivatives) (Details) - USD ($) $ in Millions | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2025 | Dec. 31, 2024
Credit Derivatives [Line Items] |  |
Estimated Fair Value of Credit Default Swaps | $ 233 | $ 196
Maximum Amount of Future Payments under Credit Default Swaps | $ 11,954 | $ 11,764
Weighted Average Years to Maturity | 3 years 9 months 18 days | 3 years 4 months 24 days
Aaa/Aa/A |  |
Credit Derivatives [Line Items] |  |
Estimated Fair Value of Credit Default Swaps | $ 64 | $ 73
Maximum Amount of Future Payments under Credit Default Swaps | $ 4,118 | $ 4,198
Weighted Average Years to Maturity | 1 year 9 months 18 days | 2 years 2 months 12 days
Aaa/Aa/A | 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 | $ 72 | $ 72
Weighted Average Years to Maturity | 1 year 7 months 6 days | 1 year 10 months 24 days
Aaa/Aa/A | Credit default swaps referencing indices |  |
Credit Derivatives [Line Items] |  |
Estimated Fair Value of Credit Default Swaps | $ 63 | $ 72
Maximum Amount of Future Payments under Credit Default Swaps | $ 4,046 | $ 4,126
Weighted Average Years to Maturity | 1 year 9 months 18 days | 2 years 2 months 12 days
Baa |  |
Credit Derivatives [Line Items] |  |
Estimated Fair Value of Credit Default Swaps | $ 147 | $ 112
Maximum Amount of Future Payments under Credit Default Swaps | $ 7,470 | $ 7,365
Weighted Average Years to Maturity | 5 years | 4 years 1 month 6 days
Baa | 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 | $ 42 | $ 102
Weighted Average Years to Maturity | 4 years 1 month 6 days | 1 year 7 months 6 days
Baa | Credit default swaps referencing indices |  |
Credit Derivatives [Line Items] |  |
Estimated Fair Value of Credit Default Swaps | $ 146 | $ 111
Maximum Amount of Future Payments under Credit Default Swaps | $ 7,428 | $ 7,263
Weighted Average Years to Maturity | 5 years | 4 years 1 month 6 days
B |  |
Credit Derivatives [Line Items] |  |
Estimated Fair Value of Credit Default Swaps | $ 22 | $ 10
Maximum Amount of Future Payments under Credit Default Swaps | $ 323 | $ 144
Weighted Average Years to Maturity | 3 years 10 months 24 days | 3 years 8 months 12 days
B | 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 | $ 19 | $ 0
Weighted Average Years to Maturity | 1 year | 0 years
B | Credit default swaps referencing indices |  |
Credit Derivatives [Line Items] |  |
Estimated Fair Value of Credit Default Swaps | $ 22 | $ 10
Maximum Amount of Future Payments under Credit Default Swaps | $ 304 | $ 144
Weighted Average Years to Maturity | 4 years 1 month 6 days | 3 years 8 months 12 days
Caa |  |
Credit Derivatives [Line Items] |  |
Estimated Fair Value of Credit Default Swaps | $ (1) | $ (1)
Maximum Amount of Future Payments under Credit Default Swaps | $ 15 | $ 15
Weighted Average Years to Maturity | 1 year 6 months | 2 years
Caa | Credit default swaps referencing indices |  |
Credit Derivatives [Line Items] |  |
Estimated Fair Value of Credit Default Swaps | $ (1) | $ (1)
Maximum Amount of Future Payments under Credit Default Swaps | $ 15 | $ 15
Weighted Average Years to Maturity | 1 year 6 months | 2 years
Ba |  |
Credit Derivatives [Line Items] |  |
Estimated Fair Value of Credit Default Swaps | $ 1 | $ 2
Maximum Amount of Future Payments under Credit Default Swaps | $ 28 | $ 42
Weighted Average Years to Maturity | 1 year 10 months 24 days | 1 year 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 | $ 3 | $ 17
Weighted Average Years to Maturity | 5 years | 1 year 1 month 6 days
Ba | Credit default swaps referencing indices |  |
Credit Derivatives [Line Items] |  |
Estimated Fair Value of Credit Default Swaps | $ 1 | $ 2
Maximum Amount of Future Payments under Credit Default Swaps | $ 25 | $ 25
Weighted Average Years to Maturity | 1 year 6 months | 2 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://www.xbrl.org/2003/role/disclosureRef -Topic 815 -SubTopic 10 -Name Accounting Standards Codification -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 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 10 -Name Accounting Standards Codification -Section 50 -Paragraph 4K -Subparagraph (f) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480434/815-10-50-4K Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 815 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 4K -Subparagraph (b)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480434/815-10-50-4K Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 815 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 4K -Subparagraph (a)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480434/815-10-50-4K Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 815 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 4L -Publisher FASB -URI https://asc.fasb.org/1943274/2147480434/815-10-50-4L Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Topic 815 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 4K -Subparagraph (c) -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://www.xbrl.org/2009/role/commonPracticeRef -Topic 815 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 4K -Subparagraph (c) -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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