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CONSOLIDATED STATEMENTS OF OPERATIONS (UNAUDITED) (USD $)
In Millions, unless otherwise specified
 3 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Operating revenues    
Sales of electricity $ 2,350 $ 2,549
Other revenue 32 30
Total operating revenues 2,382 2,579
Operating expenses    
Fuel 543 794
Purchased power 251 245
Operating and maintenance 807 919
Depreciation and amortization 441 428
Tax equivalents 122 137
Total operating expenses 2,164 2,523
Operating income 218 56
Other income (expense), net 14 15
Interest expense    
Interest expense 339 355
Allowance for funds used during construction and nuclear fuel expenditures (40) (39)
Net interest expense 299 316
Net income (loss) $ (67) $ (245)