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STATEMENTS OF OPERATIONS (UNAUDITED) (USD $)
In Millions, unless otherwise specified
 3 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Operating revenues    
Sales of electricity $ 2,540 $ 2,800
Other revenue 28 28
Total operating revenues 2,568 2,828
Operating expenses    
Fuel 640 738
Purchased power 319 360
Operating and maintenance 880 883
Depreciation and amortization 441 432
Tax equivalents 151 145
Total operating expenses 2,431 2,558
Operating income 137 270
Other income (expense), net 9 11
Interest expense    
Interest expense 358 358
Allowance for funds used during construction and nuclear fuel expenditures (39) (29)
Net interest expense 319 329
Net income (loss) $ (173) $ (48)