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Accounts Receivable, Net (Details) - USD ($)
$ in Millions
Jun. 30, 2016
Sep. 30, 2015
Accounts Receivable, Net    
Power receivables $ 1,415 $ 1,509
Other receivables 75 92
Allowance for uncollectible accounts (1) (1)
Accounts receivable, net $ 1,489 $ 1,600