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CONSOLIDATED STATEMENTS OF OPERATIONS (UNAUDITED) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 6 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Mar. 31, 2013
Mar. 31, 2012
Operating revenues        
Sales of electricity $ 2,709 $ 2,569 $ 5,258 $ 5,109
Other revenue 32 35 62 63
Total operating revenues 2,741 2,604 5,320 5,172
Operating expenses        
Fuel 672 524 1,466 1,164
Purchased power 288 329 533 648
Operating and maintenance 876 863 1,795 1,743
Depreciation and amortization 408 493 836 934
Tax equivalents 136 149 273 300
Total operating expenses 2,380 2,358 4,903 4,789
Operating income 361 246 417 383
Other income (expense), net 11 (14) 26 (5)
Interest expense        
Interest expense 359 368 714 726
Allowance for funds used during construction and nuclear fuel expenditures (41) (42) (80) (81)
Net interest expense 318 326 634 645
Net income (loss) $ 54 $ (94) $ (191) $ (267)