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Benefit Plans (Components of Net Periodic Cost (Benefit)) (Details) - Pension Benefits - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Defined Benefit Plan Disclosure [Line Items]      
Interest cost on projected benefit obligation $ 98 $ 67 $ 62
Expected return on plan assets (119) (152) (154)
Amortization of net actuarial loss (gain) 33 30 46
Settlement loss 0 0 1
Total net periodic pension cost (benefit) $ 12 $ (55) $ (45)