v3.25.4
Accumulated Other Comprehensive (Loss) Income (Changes Net of Tax in the Balances of Each Components of Other Accumulated Comprehensive Income Loss) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Increase (Decrease) in Stockholders' Equity [Roll Forward]      
Balance, beginning of year $ 13,535 $ 12,370  
Other comprehensive (loss) income before reclassifications 778 (964)  
Amounts reclassified from accumulated other comprehensive income 33 19  
Other comprehensive (loss) income, net of tax 811 (945) $ 19
Balance, end of year 15,315 13,535 12,370
Total      
Increase (Decrease) in Stockholders' Equity [Roll Forward]      
Balance, beginning of year (6,240) (5,295) (5,314)
Other comprehensive (loss) income, net of tax 811 (945) 19
Balance, end of year (5,429) (6,240) (5,295)
Pension/Post-Retirement Plans Gains (Losses)      
Increase (Decrease) in Stockholders' Equity [Roll Forward]      
Balance, beginning of year (3,408) (3,101)  
Other comprehensive (loss) income before reclassifications (332) (326)  
Amounts reclassified from accumulated other comprehensive income 33 19  
Other comprehensive (loss) income, net of tax (299) (307) (380)
Balance, end of year (3,707) (3,408) (3,101)
Foreign currency translation adjustments      
Increase (Decrease) in Stockholders' Equity [Roll Forward]      
Balance, beginning of year (2,832) (2,194)  
Other comprehensive (loss) income before reclassifications 1,110 (638) 399
Amounts reclassified from accumulated other comprehensive income 0 0  
Other comprehensive (loss) income, net of tax 1,110 (638)  
Balance, end of year $ (1,722) $ (2,832) $ (2,194)