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Retirement Plans (Net Periodic Benefit Cost) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Defined Benefit Plan Disclosure [Line Items]      
OPEB remeasurement (gain) loss $ (35) $ 3 $ (248)
Pension remeasurement gain 45 (202) (218)
Pension [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Service cost 47 51 69
Interest cost on projected benefit obligation 126 129 106
Expected return on plan assets (164) (148) (181)
(Gain) / Loss recognized 45 (202) (218)
Net periodic pension benefit cost (income) 54 (170) (224)
Pension settlement costs     55
Special/contractual termination benefits 12    
Total pension benefit cost (income) 66 (170) (169)
OPEB [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Service cost 7 8 13
Interest cost on projected benefit obligation 28 31 31
(Gain) / Loss recognized (35) 3 (248)
Amortization of prior service credit gain recognized (25) (22) (13)
Total pension benefit cost (income) $ (25) $ 20 $ (217)