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Benefit Plans (Fair Value of Plan Assets Measured on a Recurring Basis) (Details) - Fair Value, Recurring - USD ($)
$ in Millions
Dec. 31, 2024
Dec. 31, 2023
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets $ 915 $ 1,984
Total    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 618 1,584
Level 1    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 57 225
Level 2    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 548 1,345
Level 3    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 13 14
Fair Value Measured at Net Asset Value Per Share    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 297 375
Fair Value Measured at Net Asset Value Per Share | Equity securities    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 0 25
Total fixed maturity securities | Total    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 540 1,348
Total fixed maturity securities | Level 1    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 0 10
Total fixed maturity securities | Level 2    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 527 1,324
Total fixed maturity securities | Level 3    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 13 14
Corporate and other bonds | Total    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 413 1,057
Corporate and other bonds | Level 1    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 0 10
Corporate and other bonds | Level 2    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 408 1,041
Corporate and other bonds | Level 3    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 5 6
States, municipalities and political subdivisions | Total    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 6 50
States, municipalities and political subdivisions | Level 1    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 0 0
States, municipalities and political subdivisions | Level 2    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 6 50
States, municipalities and political subdivisions | Level 3    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 0 0
Asset-backed | Total    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 121 241
Asset-backed | Level 1    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 0 0
Asset-backed | Level 2    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 113 233
Asset-backed | Level 3    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 8 8
Equity securities | Total    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 23 125
Equity securities | Level 1    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 8 119
Equity securities | Level 2    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 15 6
Equity securities | Level 3    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 0 0
Short-term investments | Total    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 47 96
Short-term investments | Level 1    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 47 96
Short-term investments | Level 2    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 0 0
Short-term investments | Level 3    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 0 0
Other assets | Total    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 6 15
Other assets | Level 1    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 0 0
Other assets | Level 2    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 6 15
Other assets | Level 3    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 0 $ 0
Cash | Total    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 2  
Cash | Level 1    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 2  
Cash | Level 2    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 0  
Cash | Level 3    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets