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Accounts Receivable, Net (Details) - USD ($)
$ in Millions
Mar. 31, 2022
Sep. 30, 2021
Accounts Receivable, Net    
Accounts Receivable, before Allowance for Credit Loss, Current $ 1,277 $ 1,480
Other receivables 76 86
Allowance for uncollectible accounts 1 1
Accounts receivable, net $ 1,353 $ 1,566