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Accounts Receivable, Net Accounts Receivable, Net (Details) (USD $)
In Millions, unless otherwise specified
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2011
Accounts Receivable, Net        
Power receivables $ 1,576 $ 1,495    
Other receivables 101 73    
Allowance for uncollectible accounts (1) (1) (7) (1)
Accounts receivable, net $ 1,676 $ 1,567