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Comprehensive Income - Schedule of Accumulated Other Comprehensive Loss (Detail)
$ in Millions
 6 Months Ended
Mar. 31, 2024
USD ($)
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]  
Beginning balance $ 430
Other comprehensive income (loss) 21
Ending balance 585
Foreign Currency Translation Loss  
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]  
Beginning balance (322)
Other comprehensive income (loss) 23
Ending balance (299)
Minimum Pension Liability Adjustment  
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]  
Beginning balance (1)
Other comprehensive income (loss) (1)
Ending balance (2)
Deferred Gains (Losses) On Derivative Financial Instruments  
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]  
Beginning balance 1
Other comprehensive income (loss) (1)
Ending balance 0
Accumulated Other Comprehensive Loss, net  
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]  
Beginning balance (322)
Ending balance $ (301)