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Accumulated Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2023
Sep. 30, 2022
Mar. 31, 2022
Sep. 30, 2021
Accumulated Other Comprehensive Income (Loss) [Roll Forward]        
Beginning balance $ (226)      
Foreign currency translation adjustment 22   $ (3)  
Ending balance (191)      
Foreign Currency Translation        
Accumulated Other Comprehensive Income (Loss) [Roll Forward]        
Beginning balance (180)   (101)  
Foreign currency translation adjustment   $ 22   $ (3)
Tax on foreign currency translation adjustment   5   (2)
Ending balance   (153)   (106)
Post-retirement Benefit Plans        
Accumulated Other Comprehensive Income (Loss) [Roll Forward]        
Beginning balance (41)   (268)  
Income tax impact on amortization of post-retirement benefit plan items   1   (1)
Ending balance   (41)   (265)
Derivative Instruments        
Accumulated Other Comprehensive Income (Loss) [Roll Forward]        
Beginning balance (5)   (2)  
Unrealized gain (loss) on derivative hedge agreements   4   (6)
Income tax benefit on unrealized gain on derivative hedge agreements   (1)    
Ending balance   3   (6)
Total        
Accumulated Other Comprehensive Income (Loss) [Roll Forward]        
Beginning balance $ (226)   $ (371)  
Foreign currency translation adjustment   22   (3)
Tax on foreign currency translation adjustment   5   (2)
Income tax impact on amortization of post-retirement benefit plan items   1   (1)
Unrealized gain (loss) on derivative hedge agreements   4   (6)
Income tax benefit on unrealized gain on derivative hedge agreements   (1)    
Ending balance   (191)   (377)
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)   4
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)   4
Revenue | Derivative Instruments        
Accumulated Other Comprehensive Income (Loss) [Roll Forward]        
Reclassification of unrealized gain (loss) on foreign exchange agreements   3   2
Revenue | Total        
Accumulated Other Comprehensive Income (Loss) [Roll Forward]        
Reclassification of unrealized gain (loss) on foreign exchange agreements   3   $ 2
Cost of Revenue | Derivative Instruments        
Accumulated Other Comprehensive Income (Loss) [Roll Forward]        
Reclassification of unrealized gain (loss) on foreign exchange agreements   2    
Cost of Revenue | Total        
Accumulated Other Comprehensive Income (Loss) [Roll Forward]        
Reclassification of unrealized gain (loss) on foreign exchange agreements   $ 2