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Comprehensive Income (Loss) - Schedule of Accumulated Other Comprehensive Loss (Details) - USD ($)
$ in Millions
 12 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2021
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]      
Beginning balance $ 168 $ 46 $ (45)
Other comprehensive income (loss) 25 (145) 20
Ending balance 430 168 46
Foreign Currency Translation Gains (Losses)      
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]      
Beginning balance (358) (174) (181)
Other comprehensive income (loss) 36 (184) 7
Ending balance (322) (358) (174)
Minimum Pension Liability Adjustment      
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]      
Beginning balance (2) (11) (12)
Other comprehensive income (loss) 1 9 1
Ending balance (1) (2) (11)
Deferred Gains (Losses) On Derivative Financial Instruments      
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]      
Beginning balance 13 (17) (29)
Other comprehensive income (loss) (12) 30 12
Ending balance 1 13 (17)
Accumulated Other Comprehensive Loss, net      
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]      
Beginning balance (347) (202) (222)
Ending balance $ (322) $ (347) $ (202)