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Comprehensive Income (Loss) - Schedule of Accumulated Other Comprehensive Loss (Details) - USD ($)
$ in Millions
 12 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2018
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]      
Beginning balance $ (269) $ (320) $ 308
Other comprehensive income (loss) 18 (50) (9)
Ending balance (45) (269) (320)
Foreign Currency Translation Loss (a)      
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]      
Beginning balance (218) (184) (171)
Other comprehensive income (loss) 37 (34) (13)
Ending balance (181) (218) (184)
Minimum Pension Liability Adjustment      
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]      
Beginning balance (14) (9) (10)
Other comprehensive income (loss) 2 (5) 1
Ending balance (12) (14) (9)
Deferred Gains (Losses) On Derivative Financial Instruments      
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]      
Beginning balance (8) 3 0
Other comprehensive income (loss) (21) (11) 3
Ending balance (29) (8) 3
Accumulated Other Comprehensive Loss, net      
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]      
Beginning balance (240) (190) (181)
Ending balance $ (222) $ (240) $ (190)