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Fair Value (Narrative) (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2022 | Sep. 30, 2021 | Sep. 30, 2022 | Sep. 30, 2021 | Dec. 31, 2021
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |
Fair Value | $ 21,009 |  | $ 21,009 |  | $ 22,308
Fair value of public equity portfolio | 1,200 |  | 1,200 |  | 1,300
Other invested assets | 876 |  | 876 |  | 757
Fixed maturities - held to maturity, at amortized cost, net of credit allowances (fair value: 2022, $817, credit allowances: 2022, $(9)) | 837 |  | 837 |  |
Fixed maturities - held to maturity, at amortized cost, net of credit allowances, fair value | 817 |  | 817 |  |
Market Value [Member] |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |
Transfer in/(out) of Level 3 and reclassification of securities in/(out) of investment categories | (779) |  | (779) |  |
Fair Value [Member] | Investments [Member] |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |
Other invested assets | 309 |  | 309 |  | 287
Fixed Maturities [Member] |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |
Fair Value | 1,600 |  | 1,600 |  | 2,100
Asset Backed Securities [Member] |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |
Fair Value | 3,772 |  | 3,772 |  | 3,582
Fair value of public equity portfolio | 2,400 |  | 2,400 |  | $ 2,000
Fixed maturities - held to maturity, at amortized cost, net of credit allowances, fair value | $ 639 |  | $ 639 |  |

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