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Investments (Schedule Of Amortized Cost And Fair Value Of Held-to-Maturity Fixed Maturities) (Details) - USD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
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Schedule of Held-to-maturity Securities [Line Items] |  |  |
Debt Securities, Held-to-maturity |  | $ 8,882 |
Debt Securities, Held-to-maturity, Allowance for Credit Loss | $ 0 | 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 |  | 1,417 |
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 |  | 1,140 |
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 |  | 1,733 |
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 |  | 1,456 |
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 |  | 3,136 |
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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