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Benefit Plans (Components of Net Periodic Cost (Benefit)) (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Defined Benefit Plan Disclosure [Line Items]        
Pension settlement transaction loss (gain) $ 4   $ 4  
Pension settlement transaction gains (losses), after tax 3   3  
Pension Plan        
Defined Benefit Plan Disclosure [Line Items]        
Interest cost on projected benefit obligation 21 $ 25 65 $ 74
Expected return on plan assets (29) (29) (87) (89)
Amortization of net actuarial loss 7 7 21 24
Pension settlement transaction loss (gain) 4 0 4 0
Total net periodic pension cost (benefit) $ 3 $ 3 $ 3 $ 9