v3.26.3
Accumulated Other Comprehensive Loss - Schedule of Accumulated Other 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 Attributable to Parent, Net of Tax [Roll Forward]        
Stockholders' equity attributable to parent, beginning balance     $ 7,976  
Stockholders' equity attributable to parent, ending balance $ 7,764   7,764  
Foreign currency translation [Member]        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Stockholders' equity attributable to parent, beginning balance (677) $ (704) (608) $ (1,020)
Other comprehensive (loss)/income before reclassifications (14) (20) (83) 296
(Gain)/loss reclassified from accumulated other comprehensive loss (net of income tax) 0 0 0 0
Net other comprehensive (loss)/income (14) (20) (83) 296
Stockholders' equity attributable to parent, ending balance (691) (724) (691) (724)
Derivative instruments [Member]        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Stockholders' equity attributable to parent, beginning balance [1] 8 14 10 7
Other comprehensive (loss)/income before reclassifications [1] 1 (1) 0 7
(Gain)/loss reclassified from accumulated other comprehensive loss (net of income tax) [1] (1) (2) (2) (3)
Net other comprehensive (loss)/income [1] 0 (3) (2) 4
Stockholders' equity attributable to parent, ending balance [1] 8 11 8 11
Defined pension and post-retirement benefit costs [Member]        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Stockholders' equity attributable to parent, beginning balance (2,180) (2,016) (2,236) (2,145)
Other comprehensive (loss)/income before reclassifications 5 2 9 93
(Gain)/loss reclassified from accumulated other comprehensive loss (net of income tax) 26 18 78 56
Net other comprehensive (loss)/income 31 20 87 149
Stockholders' equity attributable to parent, ending balance (2,149) (1,996) (2,149) (1,996)
Available-for-sale securities [Member]        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Other comprehensive (loss)/income before reclassifications (1)   (1)  
Net other comprehensive (loss)/income (1)   (1)  
Stockholders' equity attributable to parent, ending balance (1)   (1)  
Total [Member]        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Stockholders' equity attributable to parent, beginning balance (2,849) (2,706) (2,834) (3,158)
Other comprehensive (loss)/income before reclassifications (9) (19) (75) 396
(Gain)/loss reclassified from accumulated other comprehensive loss (net of income tax) 25 16 76 53
Net other comprehensive (loss)/income 16 (3) 1 449
Stockholders' equity attributable to parent, ending balance $ (2,833) $ (2,709) $ (2,833) $ (2,709)
[1] Reclassification adjustments from accumulated other comprehensive loss related to derivative instruments are included in Revenue and Salaries and benefits in the accompanying condensed consolidated statements of comprehensive income. See Note 9 — Derivative Financial Instruments for additional details regarding the reclassification adjustments for the derivative settlements.