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Goodwill and Intangible Assets - Components of Intangible Assets (Details) - USD ($)
$ in Millions
Sep. 30, 2024
Sep. 30, 2023
Goodwill and Intangible Assets Disclosure [Abstract]    
Customer relationships $ 985 $ 977
Trademarks and tradenames 4 4
Noncompete agreements and other 27 26
Accumulated amortization (665) (602)
Intangible assets, net (definite-lived) 351 405
Trademarks and tradenames (indefinite-lived) 40 38
Total intangible assets, net $ 391 $ 443