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Deferred Costs, Capitalized, Prepaid, and Other Assets (Details) - USD ($)
$ in Millions
Mar. 31, 2022
Sep. 30, 2021
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]    
Other Assets, Miscellaneous, Current $ 97 $ 77
Other current assets $ 304 $ 287