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Accounts Receivable, Net (Details) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2012
Sep. 30, 2012
Accounts Receivable, Net    
Power receivables $ 1,359 $ 1,585
Other receivables 72 88
Allowance for uncollectible accounts (5) (7)
Accounts receivable, net $ 1,426 $ 1,666