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Fair Value (Narrative) (Details) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Fair Value | $ 22,236,000,000 | $ 22,308,000,000
Fair value of public equity portfolio | 97,000,000 | 1,300,000,000
Other assets | 930,000,000 | 757,000,000
Fixed Maturities [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Fair Value | 1,700,000,000 | 2,100,000,000
Asset Backed Securities [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Fair Value | 4,063,000,000 | 3,582,000,000
Fair value of public equity portfolio | 2,600,000,000 | 2,000,000,000.0
Market Value [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Transfer in and/or (out) of Level 3 | (779,000,000) | 0
Fair Value [Member] | Investments [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Other assets | $ 292,000,000 | $ 287,000,000

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