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Accumulated Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Jun. 30, 2025
Mar. 31, 2025
Sep. 30, 2024
Jun. 30, 2024
Mar. 31, 2024
Sep. 30, 2025
Sep. 30, 2024
Accumulated Other Comprehensive Income (Loss) [Roll Forward]                
Beginning balance $ 11,081 $ 10,822 $ 10,647 $ 10,348 $ 10,203 $ 10,176 $ 10,647 $ 10,176
Foreign currency translation adjustment (6)     97     87 38
Tax on foreign currency translation adjustment 0     0     (8) 0
Foreign currency translation adjustment 1     (2)     (2) 0
Ending balance 11,219 11,081 10,822 10,600 10,348 10,203 11,219 10,600
Total                
Accumulated Other Comprehensive Income (Loss) [Roll Forward]                
Beginning balance (222) (337) (435) (345) (345) (269) (435) (269)
Foreign currency translation adjustment (6) 37 56 97 6 (65)    
Amount of currency translation adjustment relating to divestiture of foreign subsidiaries reclassified into net income     8          
Tax on foreign currency translation adjustment (3) 65 20 14 (5) (10)    
Income tax impact on amortization of post-retirement benefit plan items           (1)    
Foreign currency translation adjustment for post-retirement benefit plans 1 (2)            
Foreign currency translation adjustment     (1) (2)   2    
Unrealized gain on derivative hedge agreements 1 15 15     (3)    
Income tax benefit on unrealized gain on derivative hedge agreements 1 (2) (2)          
Ending balance (233) (222) (337) (232) (345) (345) (233) (232)
Foreign Currency Translation                
Accumulated Other Comprehensive Income (Loss) [Roll Forward]                
Beginning balance (182) (284) (368) (270) (271) (196) (368) (196)
Foreign currency translation adjustment (6) 37 56 97 6 (65)    
Amount of currency translation adjustment relating to divestiture of foreign subsidiaries reclassified into net income     8          
Tax on foreign currency translation adjustment (3) 65 20 14 (5) (10)    
Ending balance (191) (182) (284) (159) (270) (271) (191) (159)
Post-retirement Benefit Plans                
Accumulated Other Comprehensive Income (Loss) [Roll Forward]                
Beginning balance (55) (54) (53) (71) (71) (72) (53) (72)
Income tax impact on amortization of post-retirement benefit plan items           (1)    
Foreign currency translation adjustment for post-retirement benefit plans 1 (2)            
Foreign currency translation adjustment     (1) (2)   2    
Income tax impact on unrealized gain on derivative hedge agreements       (1)        
Ending balance (54) (55) (54) (73) (71) (71) (54) (73)
Derivative Instruments                
Accumulated Other Comprehensive Income (Loss) [Roll Forward]                
Beginning balance 15 1 (14) (4) (3) (1) (14) (1)
Unrealized gain on derivative hedge agreements 1 15 15     (3)    
Income tax benefit on unrealized gain on derivative hedge agreements 1 (2) (2)          
Income tax impact on unrealized gain on derivative hedge agreements       (1)        
Ending balance 12 15 1 0 (4) (3) $ 12 $ 0
Revenue | Total                
Accumulated Other Comprehensive Income (Loss) [Roll Forward]                
Reclassification of unrealized gain (loss) on foreign exchange agreements (3) 2 3 1 (1)      
Revenue | Derivative Instruments                
Accumulated Other Comprehensive Income (Loss) [Roll Forward]                
Reclassification of unrealized gain (loss) on foreign exchange agreements (3) 2 3 1 $ (1)      
Cost of Revenue | Total                
Accumulated Other Comprehensive Income (Loss) [Roll Forward]                
Unrealized gain on derivative hedge agreements       3        
Reclassification of unrealized gain (loss) on foreign exchange agreements (2) (1) (1) 1   1    
Cost of Revenue | Derivative Instruments                
Accumulated Other Comprehensive Income (Loss) [Roll Forward]                
Unrealized gain on derivative hedge agreements       3        
Reclassification of unrealized gain (loss) on foreign exchange agreements $ (2) (1) $ (1) $ 1   $ 1    
Other non-operating income | Total                
Accumulated Other Comprehensive Income (Loss) [Roll Forward]                
Amortization of actuarial gain on post-retirement benefit plans into other non-operating income, net   1            
Other non-operating income | Post-retirement Benefit Plans                
Accumulated Other Comprehensive Income (Loss) [Roll Forward]                
Amortization of actuarial gain on post-retirement benefit plans into other non-operating income, net   $ 1