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Accumulated Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2023
Jun. 30, 2023
Mar. 31, 2023
Sep. 30, 2022
Jun. 30, 2022
Mar. 31, 2022
Sep. 30, 2023
Sep. 30, 2022
Accumulated Other Comprehensive Income (Loss) [Roll Forward]                
Beginning balance     $ (226)       $ (226)  
Foreign currency translation adjustment $ (61)     $ (74)     (77) $ (118)
Other non-operating income 8     1     19 2
Foreign currency translation adjustment for post-retirement benefit plans 1              
Ending balance (300)           (300)  
Foreign Currency Translation                
Accumulated Other Comprehensive Income (Loss) [Roll Forward]                
Beginning balance (182) $ (153) (180) (175) $ (106) $ (101) (180) (101)
Foreign currency translation adjustment (61) (38) 22 (74) (41) (3)    
Tax on foreign currency translation adjustment (9) 9 5 (28) (28) (2)    
Ending balance (252) (182) (153) (277) (175) (106) (252) (277)
Post-retirement Benefit Plans                
Accumulated Other Comprehensive Income (Loss) [Roll Forward]                
Beginning balance (43) (41) (41) (262) (265) (268) (41) (268)
Other non-operating income         0      
Income tax impact on amortization of post-retirement benefit plan items     1   (1) (1)    
U.K. pension settlement expense       137        
Foreign currency translation adjustment for post-retirement benefit plans   (1)   46        
Ending balance (43) (43) (41) (111) (262) (265) (43) (111)
Derivative Instruments                
Accumulated Other Comprehensive Income (Loss) [Roll Forward]                
Beginning balance (1) 3 (5) (11) (6) (2) (5) (2)
Unrealized gain on derivative hedge agreements (4) (3) 4   (9) (6)    
Income tax benefit on unrealized gain on derivative hedge agreements     (1)   1      
Ending balance (5) (1) 3 (11) (11) (6) (5) (11)
Total                
Accumulated Other Comprehensive Income (Loss) [Roll Forward]                
Beginning balance (226) (191) (226) (448) (377) (371) (226) (371)
Foreign currency translation adjustment (61) (38) 22 (74) (41) (3)    
Tax on foreign currency translation adjustment (9) 9 5 (28) (28) (2)    
Other non-operating income         0      
Income tax impact on amortization of post-retirement benefit plan items     1   (1) (1)    
Foreign currency translation adjustment for post-retirement benefit plans 1 (1)            
Unrealized gain on derivative hedge agreements (4) (3) 4   (9) (6)    
Income tax benefit on unrealized gain on derivative hedge agreements     (1)   1      
Ending balance (300) (226) (191) (399) (448) (377) $ (300) $ (399)
Other non-operating income | Post-retirement Benefit Plans                
Accumulated Other Comprehensive Income (Loss) [Roll Forward]                
Amortization of actuarial loss on post-retirement benefit plans into other non-operating income, net (1) (1) (1) 3 4 4    
Defined Benefit Plan, Accumulated Benefit Obligation, (Increase) Decrease for Settlement and Curtailment       (35)        
Other non-operating income | Total                
Accumulated Other Comprehensive Income (Loss) [Roll Forward]                
Amortization of actuarial loss on post-retirement benefit plans into other non-operating income, net $ (1) (1) (1) 3 4 4    
Defined Benefit Plan, Accumulated Benefit Obligation, (Increase) Decrease for Settlement and Curtailment       (35)        
Revenue | Derivative Instruments                
Accumulated Other Comprehensive Income (Loss) [Roll Forward]                
Reclassification of unrealized gain (loss) on foreign exchange agreements   (1) 3 6 2 2    
Revenue | Total                
Accumulated Other Comprehensive Income (Loss) [Roll Forward]                
Reclassification of unrealized gain (loss) on foreign exchange agreements   $ (1) 3 6 2 $ 2    
Cost of Revenue | Derivative Instruments                
Accumulated Other Comprehensive Income (Loss) [Roll Forward]                
Unrealized gain on derivative hedge agreements       (8)        
Reclassification of unrealized gain (loss) on foreign exchange agreements     2 2 1      
Cost of Revenue | Total                
Accumulated Other Comprehensive Income (Loss) [Roll Forward]                
Unrealized gain on derivative hedge agreements       (8)        
Reclassification of unrealized gain (loss) on foreign exchange agreements     $ 2 $ 2 $ 1