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Derivatives (Credit Derivatives) (Details) - USD ($) $ in Millions | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2022 | Dec. 31, 2021
Credit Derivatives [Line Items] |  |
Estimated Fair Value of Credit Default Swaps | $ (49) | $ 165
Maximum Amount of Future Payments under Credit Default Swaps | $ 11,786 | $ 8,626
Weighted Average Years to Maturity | 4 years 9 months 18 days | 4 years 7 months 6 days
Aaa/Aa/A |  |
Credit Derivatives [Line Items] |  |
Estimated Fair Value of Credit Default Swaps | $ 7 | $ 21
Maximum Amount of Future Payments under Credit Default Swaps | $ 2,901 | $ 1,350
Weighted Average Years to Maturity | 3 years 3 months 18 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 | $ 3 | $ 4
Maximum Amount of Future Payments under Credit Default Swaps | $ 159 | $ 159
Weighted Average Years to Maturity | 2 years 7 months 6 days | 3 years 1 month 6 days
Aaa/Aa/A | Credit default swaps referencing indices |  |
Credit Derivatives [Line Items] |  |
Estimated Fair Value of Credit Default Swaps | $ 4 | $ 17
Maximum Amount of Future Payments under Credit Default Swaps | $ 2,742 | $ 1,191
Weighted Average Years to Maturity | 3 years 3 months 18 days | 2 years 6 months
Baa [Member] |  |
Credit Derivatives [Line Items] |  |
Estimated Fair Value of Credit Default Swaps | $ (44) | $ 148
Maximum Amount of Future Payments under Credit Default Swaps | $ 8,713 | $ 7,089
Weighted Average Years to Maturity | 5 years 4 months 24 days | 5 years
Baa [Member] | Single name credit default swaps (3) |  |
Credit Derivatives [Line Items] |  |
Estimated Fair Value of Credit Default Swaps | $ 2 | $ 2
Maximum Amount of Future Payments under Credit Default Swaps | $ 101 | $ 101
Weighted Average Years to Maturity | 2 years 8 months 12 days | 3 years 4 months 24 days
Baa [Member] | Credit default swaps referencing indices |  |
Credit Derivatives [Line Items] |  |
Estimated Fair Value of Credit Default Swaps | $ (46) | $ 146
Maximum Amount of Future Payments under Credit Default Swaps | $ 8,612 | $ 6,988
Weighted Average Years to Maturity | 5 years 4 months 24 days | 5 years
B |  |
Credit Derivatives [Line Items] |  |
Estimated Fair Value of Credit Default Swaps | $ 1 | $ 5
Maximum Amount of Future Payments under Credit Default Swaps | $ 55 | $ 55
Weighted Average Years to Maturity | 3 years 6 months | 4 years
B | Credit default swaps referencing indices |  |
Credit Derivatives [Line Items] |  |
Estimated Fair Value of Credit Default Swaps | $ 1 | $ 5
Maximum Amount of Future Payments under Credit Default Swaps | $ 55 | $ 55
Weighted Average Years to Maturity | 3 years 6 months | 4 years
Ba |  |
Credit Derivatives [Line Items] |  |
Estimated Fair Value of Credit Default Swaps | $ (2) | $ 0
Maximum Amount of Future Payments under Credit Default Swaps | $ 87 | $ 102
Weighted Average Years to Maturity | 3 years 3 months 18 days | 2 years
Ba | Single name credit default swaps (3) |  |
Credit Derivatives [Line Items] |  |
Estimated Fair Value of Credit Default Swaps | $ 0 | $ 1
Maximum Amount of Future Payments under Credit Default Swaps | $ 42 | $ 82
Weighted Average Years to Maturity | 2 years | 1 year 2 months 12 days
Ba | Credit default swaps referencing indices |  |
Credit Derivatives [Line Items] |  |
Estimated Fair Value of Credit Default Swaps | $ (2) | $ (1)
Maximum Amount of Future Payments under Credit Default Swaps | $ 45 | $ 20
Weighted Average Years to Maturity | 4 years 6 months | 5 years
Caa3 |  |
Credit Derivatives [Line Items] |  |
Estimated Fair Value of Credit Default Swaps | $ (11) | $ (9)
Maximum Amount of Future Payments under Credit Default Swaps | $ 30 | $ 30
Weighted Average Years to Maturity | 4 years | 4 years 6 months
Caa3 | Credit default swaps referencing indices |  |
Credit Derivatives [Line Items] |  |
Estimated Fair Value of Credit Default Swaps | $ (11) | $ (9)
Maximum Amount of Future Payments under Credit Default Swaps | $ 30 | $ 30
Weighted Average Years to Maturity | 4 years | 4 years 6 months

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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 -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4K -Subparagraph (b)(1) -URI https://asc.fasb.org/extlink&oid=125515794&loc=SL5708775-113959 + Details
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Data Type: | xbrli:monetaryItemType
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 -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4K -Subparagraph (c) -URI https://asc.fasb.org/extlink&oid=125515794&loc=SL5708775-113959 + Details
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Namespace Prefix: | us-gaap_
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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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