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Comprehensive Income (Loss) - Schedule of Accumulated Other Comprehensive Loss (Detail)
$ in Millions
 9 Months Ended
Jun. 30, 2020
USD ($)
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]  
Beginning balance $ (269)
Other comprehensive income (loss) (13)
Ending balance (21)
Foreign Currency Translation Loss  
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]  
Beginning balance (218)
Other comprehensive income (loss) 9
Ending balance (209)
Minimum Pension Liability Adjustment  
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]  
Beginning balance (14)
Other comprehensive income (loss) 0
Ending balance (14)
Deferred Gains (Losses) On Derivative Financial Instruments  
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]  
Beginning balance (8)
Other comprehensive income (loss) (22)
Ending balance (30)
Accumulated Other Comprehensive Loss, net  
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]  
Beginning balance (240)
Ending balance $ (253)