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Accounts Receivable, Net (Details) - USD ($)
$ in Millions
Mar. 31, 2018
Sep. 30, 2017
Accounts Receivable, Net    
Power receivables $ 1,269 $ 1,441
Other receivables 60 129
Allowance for uncollectible accounts 1 1
Accounts receivable, net $ 1,329 $ 1,569