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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, 2024
Dec. 31, 2023
Dec. 31, 2022
Defined Benefit Plan Fair Value Disclosure      
Pension plan assets at fair value $ 358 $ 317 $ 332
Fixed Maturities      
Defined Benefit Plan Fair Value Disclosure      
Pension plan assets at fair value 25 32  
Fixed Maturities | Level 1      
Defined Benefit Plan Fair Value Disclosure      
Pension plan assets at fair value 13 22  
Fixed Maturities | Level 2      
Defined Benefit Plan Fair Value Disclosure      
Pension plan assets at fair value 12 10  
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 5 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 5 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 7 4  
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 7 4  
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 13 22  
Fixed Maturities | United States Government | Level 1      
Defined Benefit Plan Fair Value Disclosure      
Pension plan assets at fair value 13 22  
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 297 269  
Equity Securities | Level 1      
Defined Benefit Plan Fair Value Disclosure      
Pension plan assets at fair value 297 269  
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 322 301  
Fixed Maturities And Equity Securities | Level 1      
Defined Benefit Plan Fair Value Disclosure      
Pension plan assets at fair value 310 291  
Fixed Maturities And Equity Securities | Level 2      
Defined Benefit Plan Fair Value Disclosure      
Pension plan assets at fair value 12 10  
Fixed Maturities And Equity Securities | Level 3      
Defined Benefit Plan Fair Value Disclosure      
Pension plan assets at fair value $ 0 $ 0