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Retirement Plans (Net Periodic Benefit Cost) (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Defined Benefit Plan Disclosure [Line Items]        
Pension remeasurement gain $ 0 $ (23) $ (44) $ (25)
Pension building sale - loss 19   19  
OPEB remeasurement (gain) loss 0 21 8 (6)
Pension [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Service cost 11 11 33 34
Interest cost on projected benefit obligation 31 31 95 94
Expected return on plan assets (38) (40) (114) (124)
Pension remeasurement gain   (23) (44) (25)
Pension building sale - loss 19   19  
Net periodic pension (benefit) costs 23 (21) (11) (21)
Pension special termination benefit enhancements   1   11
Total pension periodic postretirement (benefit) cost 23 (20) (11) (10)
OPEB [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Service cost 3 2 5 5
Interest cost on projected benefit obligation 8 7 22 22
Amortization of prior service credit gain recognized (7) (6) (19) (19)
OPEB remeasurement (gain) loss   21 8 (6)
Total pension periodic postretirement (benefit) cost $ 4 $ 24 $ 16 $ 2