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Comprehensive Income (Loss) - Schedule of Accumulated Other Comprehensive Loss (Details) - USD ($)
$ in Millions
 12 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2022
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]      
Beginning balance $ 430 $ 168 $ 46
Other comprehensive (loss) income 75 25 (145)
Ending balance 675 430 168
Foreign Currency Translation Gains (Losses)      
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]      
Beginning balance (322) (358) (174)
Other comprehensive (loss) income 78 36 (184)
Ending balance (244) (322) (358)
Minimum Pension Liability Adjustment      
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]      
Beginning balance (1) (2) (11)
Other comprehensive (loss) income (2) 1 9
Ending balance (3) (1) (2)
Deferred Gains (Losses) On Derivative Financial Instruments      
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]      
Beginning balance 1 13 (17)
Other comprehensive (loss) income (1) (12) 30
Ending balance 0 1 13
Accumulated Other Comprehensive Loss, net      
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]      
Beginning balance (322) (347) (202)
Ending balance $ (247) $ (322) $ (347)