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Derivative Instruments (Exposure from Credit Derivatives by Rating of the Underlying Credits) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020
Credit Derivatives [Line Items] |  |  |
Credit Risk Derivatives, at Fair Value, Net | [1] | $ 28 | $ 13
Maximum Potential Future Exposure on Credit Risk Derivatives | [1],[2] | $ 1,321 | $ 1,517
Derivative Average Remaining Maturity | [1],[3] | 9 years | 5 years 7 months 6 days
Standard Poors AAA To A Ratings [Member] |  |  |
Credit Derivatives [Line Items] |  |  |
Credit Risk Derivatives, at Fair Value, Net | [1] | $ 28 | $ 11
Maximum Potential Future Exposure on Credit Risk Derivatives | [1],[2] | $ 600 | $ 287
Derivative Average Remaining Maturity | [1],[3] | 14 years 2 months 12 days | 15 years
Standard & Poor's, BBB Rating [Member] |  |  |
Credit Derivatives [Line Items] |  |  |
Credit Risk Derivatives, at Fair Value, Net | [1] | $ 1 | $ 2
Maximum Potential Future Exposure on Credit Risk Derivatives | [1],[2] | $ 706 | $ 1,220
Derivative Average Remaining Maturity | [1],[3] | 4 years 7 months 6 days | 3 years 6 months
Standard & Poor's, BB+ Rating [Member] |  |  |
Credit Derivatives [Line Items] |  |  |
Credit Risk Derivatives, at Fair Value, Net | [1] | $ (1) | $ 0
Maximum Potential Future Exposure on Credit Risk Derivatives | [1],[2] | $ 15 | $ 10
Derivative Average Remaining Maturity | [1],[3] | 3 years 6 months | 8 months 12 days
Single Name Credit Default Swaps [Member] | Standard Poors AAA To A Ratings [Member] |  |  |
Credit Derivatives [Line Items] |  |  |
Credit Risk Derivatives, at Fair Value, Net | [1] | $ 28 | $ 11
Maximum Potential Future Exposure on Credit Risk Derivatives | [1],[2] | $ 600 | $ 287
Derivative Average Remaining Maturity | [1],[3] | 14 years 2 months 12 days | 15 years
Single Name Credit Default Swaps [Member] | Standard & Poor's, BBB Rating [Member] |  |  |
Credit Derivatives [Line Items] |  |  |
Credit Risk Derivatives, at Fair Value, Net | [1] | $ 1 | $ 2
Maximum Potential Future Exposure on Credit Risk Derivatives | [1],[2] | $ 141 | $ 232
Derivative Average Remaining Maturity | [1],[3] | 2 years 4 months 24 days | 1 year 7 months 6 days
Single Name Credit Default Swaps [Member] | Standard & Poor's, BB+ Rating [Member] |  |  |
Credit Derivatives [Line Items] |  |  |
Credit Risk Derivatives, at Fair Value, Net | [1] | $ (1) | $ 0
Maximum Potential Future Exposure on Credit Risk Derivatives | [1],[2] | $ 15 | $ 10
Derivative Average Remaining Maturity | [1],[3] | 3 years 6 months | 8 months 12 days
Credit Default Swaps Referencing Indices [Member] | Standard & Poor's, BBB Rating [Member] |  |  |
Credit Derivatives [Line Items] |  |  |
Credit Risk Derivatives, at Fair Value, Net | [1] | $ 0 | $ 0
Maximum Potential Future Exposure on Credit Risk Derivatives | [1],[2] | $ 565 | $ 988
Derivative Average Remaining Maturity | [1],[3] | 5 years 1 month 6 days | 3 years 10 months 24 days
[1] | The rating agency designations are based on ratings from Standard and Poor’s (“S&P”).
[2] | Assumes the value of the referenced credit obligations is zero.
[3] | The weighted average years to maturity of the credit default swaps is calculated based on weighted average notional amounts

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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 http://asc.fasb.org/extlink&oid=125515794&loc=SL5708775-113959 + 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 -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4K -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=125515794&loc=SL5708775-113959 + 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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