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Benefit Plans (Schedule of Components of Net Periodic Pension Cost) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Pension [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Service cost $ 41 $ 39 $ 64
Interest cost 321 333 206
Expected return on plan assets (465) (485) (493)
Amortization:      
Net loss (gain) 28 4 96
Prior service cost (credit) 5 6 6
Net periodic benefit cost (income) (70) (103) (121)
Postretirement Benefit Plan [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Service cost 15 15 23
Interest cost 62 65 41
Expected return on plan assets (6) (8) (13)
Amortization:      
Net loss (gain) (6) (2) 18
Prior service cost (credit) (41) (40) (45)
Net periodic benefit cost (income) $ 24 $ 30 $ 24