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Accounts Receivable, Net (Details) (USD $)
In Millions, unless otherwise specified
Mar. 31, 2015
Sep. 30, 2014
Accounts Receivable, Net    
Power receivables $ 1,364us-gaap_AccountsReceivableGrossCurrent $ 1,576us-gaap_AccountsReceivableGrossCurrent
Other receivables 69us-gaap_OtherReceivablesGrossCurrent 101us-gaap_OtherReceivablesGrossCurrent
Allowance for uncollectible accounts (1)us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent (1)us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent
Accounts receivable, net $ 1,432us-gaap_AccountsReceivableNetCurrent $ 1,676us-gaap_AccountsReceivableNetCurrent