v3.26.1
Other Comprehensive (Loss) Income (Changes Net of Tax in the Balances of Each Components of Other Accumulated Comprehensive Income Loss) (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]        
Balance, beginning of period     $ 15,315  
Other comprehensive (loss) income, net of tax $ (15) $ 652 (146) $ 996
Balance, end of period 15,433 15,976 15,433 15,976
Deferred tax assets, net 1,600 1,600 1,600 1,600
Total        
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]        
Balance, beginning of period (5,560) (5,896) (5,429) (6,240)
Other comprehensive income (loss) before reclassifications (34) 643 (182) 980
Amounts reclassified from accumulated other comprehensive income 19 9 36 16
Other comprehensive (loss) income, net of tax (15) 652 (146) 996
Balance, end of period (5,575) (5,244) (5,575) (5,244)
Pension/Post-Retirement Plans Gains (Losses)        
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]        
Balance, beginning of period (3,632) (3,475) (3,707) (3,408)
Other comprehensive income (loss) before reclassifications 15 (166) 73 (240)
Amounts reclassified from accumulated other comprehensive income 19 9 36 16
Other comprehensive (loss) income, net of tax 34 (157) 109 (224)
Balance, end of period (3,598) (3,632) (3,598) (3,632)
Foreign Currency Translation Adjustments        
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]        
Balance, beginning of period (1,928) (2,421) (1,722) (2,832)
Other comprehensive income (loss) before reclassifications (49) 809 (255) 1,220
Amounts reclassified from accumulated other comprehensive income 0 0 0 0
Other comprehensive (loss) income, net of tax (49) 809 (255) 1,220
Balance, end of period $ (1,977) $ (1,612) $ (1,977) $ (1,612)