v3.26.3
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 9 Months Ended
Sep. 30, 2026
Sep. 30, 2025
Sep. 30, 2026
Sep. 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 $ 61 $ (197) (85) $ 799
Balance, end of period 14,910 15,359 14,910 15,359
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 (5,575) (5,244) (5,429) (6,240)
Other comprehensive (loss) income before reclassifications 43 (205) (139) 775
Amounts reclassified from accumulated other comprehensive income 18 8 54 24
Other comprehensive (loss) income, net of tax 61 (197) (85) 799
Balance, end of period (5,514) (5,441) (5,514) (5,441)
Pension/Post-Retirement Plans Gains (Losses)        
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]        
Balance, beginning of period (3,598) (3,632) (3,707) (3,408)
Other comprehensive (loss) income before reclassifications (5) 58 68 (182)
Amounts reclassified from accumulated other comprehensive income 18 8 54 24
Other comprehensive (loss) income, net of tax 13 66 122 (158)
Balance, end of period (3,585) (3,566) (3,585) (3,566)
Foreign Currency Translation Adjustments        
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]        
Balance, beginning of period (1,977) (1,612) (1,722) (2,832)
Other comprehensive (loss) income before reclassifications 48 (263) (207) 957
Amounts reclassified from accumulated other comprehensive income 0 0 0 0
Other comprehensive (loss) income, net of tax 48 (263) (207) 957
Balance, end of period $ (1,929) $ (1,875) $ (1,929) $ (1,875)