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Accounts Receivable, Net (Details) - USD ($)
$ in Millions
Dec. 31, 2019
Sep. 30, 2019
Accounts Receivable, Net    
Accounts Receivable, before Allowance for Credit Loss, Current $ 1,326 $ 1,624
Other receivables 101 115
Allowance for uncollectible accounts 1 1
Accounts receivable, net $ 1,427 $ 1,739