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CONSOLIDATED STATEMENTS OF OPERATIONS (UNAUDITED) (USD $)
In Millions, unless otherwise specified
 3 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Operating revenues    
Sales of electricity $ 2,549 $ 2,540
Other revenue 30 28
Total operating revenues 2,579 2,568
Operating expenses    
Fuel 794 640
Purchased power 245 319
Operating and maintenance 919 880
Depreciation and amortization 428 441
Tax equivalents 137 151
Total operating expenses 2,523 2,431
Operating income 56 137
Other income (expense), net 15 9
Interest expense    
Interest expense 355 358
Allowance for funds used during construction and nuclear fuel expenditures (39) (39)
Net interest expense 316 319
Net income (loss) $ (245) $ (173)