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Accumulated Other Comprehensive Loss - Reclassifications (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Reclassifications out of accumulated other comprehensive income loss by component        
Other income, net $ (17) $ (54) $ (75) $ (321)
Total before tax 813 172 2,207 111
Income tax (benefit) expense (192) (24) (470) 29
Net of tax 621 148 1,737 140
Decrease (Increase) in Net Income | Defined Benefit Plan        
Reclassifications out of accumulated other comprehensive income loss by component        
Total before tax 27 20 82 58
Income tax (benefit) expense (6) (5) (20) (14)
Net of tax 21 15 62 44
Decrease (Increase) in Net Income | Net actuarial loss        
Reclassifications out of accumulated other comprehensive income loss by component        
Other income, net 30 24 89 69
Decrease (Increase) in Net Income | Prior service credit        
Reclassifications out of accumulated other comprehensive income loss by component        
Other income, net $ (3) $ (4) $ (7) $ (11)