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CONSOLIDATED STATEMENTS OF OPERATIONS (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2012
Operating revenues      
Revenue from sales of electricity $ 10,999 $ 10,829 $ 11,086
Other revenue 138 127 134
Total operating revenues 11,137 10,956 11,220
Operating expenses      
Fuel 2,730 2,820 2,680
Purchased power 1,094 1,027 1,189
Operating and maintenance 3,341 3,428 3,510
Depreciation and amortization 1,843 1,680 1,919
Tax equivalents 540 548 622
Total operating expenses 9,548 9,503 9,920
Operating income 1,589 1,453 1,300
Other income (expense), net 49 44 33
Interest expense      
Interest expense 1,344 1,394 1,444
Allowance for funds used during construction and nuclear fuel expenditures (175) (168) (171)
Net interest expense 1,169 1,226 1,273
Net income (loss) $ 469 $ 271 $ 60