v3.25.4
Pension And Postretirement Benefits (Other Changes Recognized in Other Comprehensive Income) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Accumulated Other Comprehensive (Income) Loss, Defined Benefit Plan, after Tax [Roll Forward]      
Prior service (cost) credit $ 0 $ 0 $ 32
Amortization of prior service credit (1,427) (1,523) (1,963)
Pension Benefits      
Accumulated Other Comprehensive (Income) Loss, Defined Benefit Plan, after Tax [Roll Forward]      
Balance at beginning of year 150 216 316
Prior service (cost) credit 0 0 0
Amortization of prior service credit (36) (66) (100)
Total recognized in other comprehensive (income) loss (36) (66) (100)
Balance at end of year 114 150 216
Postretirement Benefits      
Accumulated Other Comprehensive (Income) Loss, Defined Benefit Plan, after Tax [Roll Forward]      
Balance at beginning of year 3,066 4,523 6,354
Prior service (cost) credit 0 0 32
Amortization of prior service credit (1,392) (1,457) (1,863)
Total recognized in other comprehensive (income) loss (1,392) (1,457) (1,831)
Balance at end of year $ 1,674 $ 3,066 $ 4,523