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Comprehensive Income - Schedule of Accumulated Other Comprehensive Loss (Detail)
$ in Millions
 6 Months Ended
Mar. 31, 2023
USD ($)
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]  
Beginning balance $ 168
Other comprehensive income (loss) 86
Ending balance 266
Foreign Currency Translation Loss  
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]  
Beginning balance (358)
Other comprehensive income (loss) 91
Ending balance (267)
Minimum Pension Liability Adjustment  
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]  
Beginning balance (2)
Other comprehensive income (loss) 0
Ending balance (2)
Deferred Gains (Losses) On Derivative Financial Instruments  
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]  
Beginning balance 13
Other comprehensive income (loss) (5)
Ending balance 8
Accumulated Other Comprehensive Loss, net  
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]  
Beginning balance (347)
Ending balance $ (261)