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Comprehensive Income - Schedule of Accumulated Other Comprehensive Loss (Details)
$ in Millions
 6 Months Ended
Mar. 31, 2025
USD ($)
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]  
Beginning balance $ 675
Other comprehensive loss (45)
Ending balance 790
Accumulated Other Comprehensive Loss, net  
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]  
Beginning balance (247)
Ending balance (292)
Foreign Currency Translation Loss  
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]  
Beginning balance (244)
Other comprehensive loss (45)
Ending balance (289)
Minimum Pension Liability Adjustment  
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]  
Beginning balance (3)
Other comprehensive loss 0
Ending balance $ (3)