Comprehensive Income - Schedule of Accumulated Other Comprehensive Loss (Detail) $ in Millions	9 Months Ended
	Jun. 30, 2022 USD ($)
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance	$ 46
Other comprehensive (loss) income	(76)
Ending balance	172
Foreign Currency Translation Loss
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance	(174)
Other comprehensive (loss) income	(102)
Ending balance	(276)
Minimum Pension Liability Adjustment
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance	(11)
Other comprehensive (loss) income	0
Ending balance	(11)
Deferred Gains (Losses) On Derivative Financial Instruments
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance	(17)
Other comprehensive (loss) income	26
Ending balance	9
Accumulated Other Comprehensive Loss, net
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance	(202)
Ending balance	$ (278)