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Benefit Plans (Schedule of Components of Net Periodic Benefit Cost (Income)) (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Pension [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Service cost $ 10 $ 10 $ 28 $ 31
Interest cost 78 81 237 242
Expected return on plan assets (107) (116) (322) (349)
Amortization:        
Net loss (gain) 12 8 37 21
Prior service cost (credit) 2 1 4 4
Net periodic benefit cost (income) (5) (16) (16) (51)
Postretirement [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Service cost 2 3 8 11
Interest cost 14 14 42 46
Expected return on plan assets (1) (1) (3) (4)
Amortization:        
Net loss (gain) (3) (2) (9) (4)
Prior service cost (credit) (11) (10) (31) (30)
Net periodic benefit cost (income) $ 1 $ 4 $ 7 $ 19