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Employee Retirement Benefits (Fair Value Hierarchy Of Assets Measured At Fair Value On A Recurring Basis) (Details) - USD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | --- | ---
Defined Benefit Plan Fair Value Disclosure |  |  |
Pension plan assets at fair value | $ 317 | $ 332 | $ 397
Fixed Maturities |  |  |
Defined Benefit Plan Fair Value Disclosure |  |  |
Pension plan assets at fair value | 32 | 44 |
Fixed Maturities | Level 1 |  |  |
Defined Benefit Plan Fair Value Disclosure |  |  |
Pension plan assets at fair value | 22 | 31 |
Fixed Maturities | Level 2 |  |  |
Defined Benefit Plan Fair Value Disclosure |  |  |
Pension plan assets at fair value | 10 | 13 |
Fixed Maturities | Level 3 |  |  |
Defined Benefit Plan Fair Value Disclosure |  |  |
Pension plan assets at fair value | 0 | 0 |
Fixed Maturities | States, Municipalities and Political Subdivisions |  |  |
Defined Benefit Plan Fair Value Disclosure |  |  |
Pension plan assets at fair value | 6 | 6 |
Fixed Maturities | States, Municipalities and Political Subdivisions | Level 1 |  |  |
Defined Benefit Plan Fair Value Disclosure |  |  |
Pension plan assets at fair value | 0 | 0 |
Fixed Maturities | States, Municipalities and Political Subdivisions | Level 2 |  |  |
Defined Benefit Plan Fair Value Disclosure |  |  |
Pension plan assets at fair value | 6 | 6 |
Fixed Maturities | States, Municipalities and Political Subdivisions | Level 3 |  |  |
Defined Benefit Plan Fair Value Disclosure |  |  |
Pension plan assets at fair value | 0 | 0 |
Fixed Maturities | Domestic Corporate Debt Securities |  |  |
Defined Benefit Plan Fair Value Disclosure |  |  |
Pension plan assets at fair value | 4 | 7 |
Fixed Maturities | Domestic Corporate Debt Securities | Level 1 |  |  |
Defined Benefit Plan Fair Value Disclosure |  |  |
Pension plan assets at fair value | 0 | 0 |
Fixed Maturities | Domestic Corporate Debt Securities | Level 2 |  |  |
Defined Benefit Plan Fair Value Disclosure |  |  |
Pension plan assets at fair value | 4 | 7 |
Fixed Maturities | Domestic Corporate Debt Securities | Level 3 |  |  |
Defined Benefit Plan Fair Value Disclosure |  |  |
Pension plan assets at fair value | 0 | 0 |
Fixed Maturities | United States Government |  |  |
Defined Benefit Plan Fair Value Disclosure |  |  |
Pension plan assets at fair value | 22 | 31 |
Fixed Maturities | United States Government | Level 1 |  |  |
Defined Benefit Plan Fair Value Disclosure |  |  |
Pension plan assets at fair value | 22 | 31 |
Fixed Maturities | United States Government | Level 2 |  |  |
Defined Benefit Plan Fair Value Disclosure |  |  |
Pension plan assets at fair value | 0 | 0 |
Fixed Maturities | United States Government | Level 3 |  |  |
Defined Benefit Plan Fair Value Disclosure |  |  |
Pension plan assets at fair value | 0 | 0 |
Equity Securities |  |  |
Defined Benefit Plan Fair Value Disclosure |  |  |
Pension plan assets at fair value | 269 | 245 |
Equity Securities | Level 1 |  |  |
Defined Benefit Plan Fair Value Disclosure |  |  |
Pension plan assets at fair value | 269 | 245 |
Equity Securities | Level 2 |  |  |
Defined Benefit Plan Fair Value Disclosure |  |  |
Pension plan assets at fair value | 0 | 0 |
Equity Securities | Level 3 |  |  |
Defined Benefit Plan Fair Value Disclosure |  |  |
Pension plan assets at fair value | 0 | 0 |
Fixed Maturities And Equity Securities |  |  |
Defined Benefit Plan Fair Value Disclosure |  |  |
Pension plan assets at fair value | 301 | 289 |
Fixed Maturities And Equity Securities | Level 1 |  |  |
Defined Benefit Plan Fair Value Disclosure |  |  |
Pension plan assets at fair value | 291 | 276 |
Fixed Maturities And Equity Securities | Level 2 |  |  |
Defined Benefit Plan Fair Value Disclosure |  |  |
Pension plan assets at fair value | 10 | 13 |
Fixed Maturities And Equity Securities | Level 3 |  |  |
Defined Benefit Plan Fair Value Disclosure |  |  |
Pension plan assets at fair value | $ 0 | $ 0 |

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