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Investments (Schedule Of Amortized Cost And Fair Value Of Held-to-Maturity Fixed Maturities) (Details) - USD ($) $ in Millions | Sep. 30, 2023 | Jun. 30, 2023 | Dec. 31, 2022 | Sep. 30, 2022 | Jun. 30, 2022 | Dec. 31, 2021
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Schedule of Held-to-maturity Securities [Line Items] |  |  |  |  |  |
Debt Securities, Held to maturity, Allowance for Credit Loss | $ 0 | $ 0 | $ 34 | $ 33 | $ 34 | $ 35
Debt securities, held to maturity, net carrying value | 0 |  | 8,848 |  |  |
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain |  |  | 3 |  |  |
Debt Securities, Held-to-Maturity, Accumulated Unrecognized Loss |  |  | (412) |  |  |
Held to maturity, Fair Value | $ 0 |  | 8,439 |  |  |
U.S. Treasury / Agency |  |  |  |  |  |
Schedule of Held-to-maturity Securities [Line Items] |  |  |  |  |  |
Debt Securities, Held to maturity, Allowance for Credit Loss |  |  | 0 |  |  |
Debt securities, held to maturity, net carrying value |  |  | 1,417 |  |  |
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain |  |  | 1 |  |  |
Debt Securities, Held-to-Maturity, Accumulated Unrecognized Loss |  |  | (48) |  |  |
Held to maturity, Fair Value |  |  | 1,370 |  |  |
Non-U.S. |  |  |  |  |  |
Schedule of Held-to-maturity Securities [Line Items] |  |  |  |  |  |
Debt Securities, Held to maturity, Allowance for Credit Loss |  |  | 4 |  |  |
Debt securities, held to maturity, net carrying value |  |  | 1,136 |  |  |
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain |  |  | 0 |  |  |
Debt Securities, Held-to-Maturity, Accumulated Unrecognized Loss |  |  | (82) |  |  |
Held to maturity, Fair Value |  |  | 1,054 |  |  |
Corporate and asset-backed securities |  |  |  |  |  |
Schedule of Held-to-maturity Securities [Line Items] |  |  |  |  |  |
Debt Securities, Held to maturity, Allowance for Credit Loss |  |  | 28 |  |  |
Debt securities, held to maturity, net carrying value |  |  | 1,705 |  |  |
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain |  |  | 1 |  |  |
Debt Securities, Held-to-Maturity, Accumulated Unrecognized Loss |  |  | (126) |  |  |
Held to maturity, Fair Value |  |  | 1,580 |  |  |
Mortgage-backed securities |  |  |  |  |  |
Schedule of Held-to-maturity Securities [Line Items] |  |  |  |  |  |
Debt Securities, Held to maturity, Allowance for Credit Loss |  |  | 1 |  |  |
Debt securities, held to maturity, net carrying value |  |  | 1,455 |  |  |
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain |  |  | 0 |  |  |
Debt Securities, Held-to-Maturity, Accumulated Unrecognized Loss |  |  | (104) |  |  |
Held to maturity, Fair Value |  |  | 1,351 |  |  |
Municipal |  |  |  |  |  |
Schedule of Held-to-maturity Securities [Line Items] |  |  |  |  |  |
Debt Securities, Held to maturity, Allowance for Credit Loss |  |  | 1 |  |  |
Debt securities, held to maturity, net carrying value |  |  | 3,135 |  |  |
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain |  |  | 1 |  |  |
Debt Securities, Held-to-Maturity, Accumulated Unrecognized Loss |  |  | (52) |  |  |
Held to maturity, Fair Value |  |  | $ 3,084 |  |  |

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