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CONSOLIDATED STATEMENTS OF OPERATIONS (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2011
Operating revenues      
Sales of electricity $ 10,829 $ 11,086 $ 11,723
Other revenue 127 134 118
Total operating revenues 10,956 11,220 11,841
Operating expenses      
Fuel 2,820 2,680 2,926
Purchased power 1,027 1,189 1,427
Operating and maintenance 3,428 3,510 3,617
Depreciation and amortization 1,680 1,919 1,772
Tax equivalents 548 622 662
Total operating expenses 9,503 9,920 10,404
Operating income 1,453 1,300 1,437
Other income (expense), net 44 33 30
Interest expense      
Interest expense 1,394 1,444 1,431
Allowance for funds used during construction and nuclear fuel expenditures (168) (171) (126)
Net interest expense 1,226 1,273 1,305
Net income (loss) $ 271 $ 60 $ 162