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Accounts Receivable, Net (Details) - USD ($)
$ in Millions
Dec. 31, 2021
Sep. 30, 2021
Accounts Receivable, Net    
Accounts Receivable, before Allowance for Credit Loss, Current $ 1,310 $ 1,480
Other receivables 74 86
Accounts Receivable, Allowance for Credit Loss 1 0
Allowance for uncollectible accounts 1  
Accounts receivable, net $ 1,383 $ 1,566