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Comprehensive Income (Loss) - Schedule of Accumulated Other Comprehensive Loss (Details) - USD ($)
$ in Millions
 12 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2020
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]      
Beginning balance $ 46 $ (45) $ (269)
Other comprehensive income (loss) (145) 20 18
Ending balance 168 46 (45)
Foreign Currency Translation Loss      
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]      
Beginning balance (174) (181) (218)
Other comprehensive income (loss) (184) 7 37
Ending balance (358) (174) (181)
Minimum Pension Liability Adjustment      
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]      
Beginning balance (11) (12) (14)
Other comprehensive income (loss) 9 1 2
Ending balance (2) (11) (12)
Deferred (Losses) Gains On Derivative Financial Instruments      
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]      
Beginning balance (17) (29) (8)
Other comprehensive income (loss) 30 12 (21)
Ending balance 13 (17) (29)
Accumulated Other Comprehensive Loss, net      
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]      
Beginning balance (202) (222) (240)
Ending balance $ (347) $ (202) $ (222)