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Comprehensive Income (Loss) - Schedule of Accumulated Other Comprehensive Loss (Detail)
$ in Millions
 6 Months Ended
Mar. 31, 2021
USD ($)
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]  
Beginning balance $ (45)
Other comprehensive income 13
Ending balance 73
Foreign Currency Translation Loss  
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]  
Beginning balance (181)
Other comprehensive income 7
Ending balance (174)
Minimum Pension Liability Adjustment  
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]  
Beginning balance (12)
Other comprehensive income 0
Ending balance (12)
Deferred Gains (Losses) On Derivative Financial Instruments  
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]  
Beginning balance (29)
Other comprehensive income 6
Ending balance (23)
Accumulated Other Comprehensive Loss, net  
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]  
Beginning balance (222)
Ending balance $ (209)