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Comprehensive Income - Schedule of Accumulated Other Comprehensive Loss (Detail)
$ in Millions
 9 Months Ended
Jun. 30, 2024
USD ($)
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]  
Beginning balance $ 430
Other comprehensive income (loss) 11
Ending balance 635
Foreign Currency Translation Loss  
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]  
Beginning balance (322)
Other comprehensive income (loss) 13
Ending balance (309)
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 $ (311)