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CONSOLIDATED STATEMENTS OF OPERATIONS (UNAUDITED) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 6 Months Ended
Mar. 31, 2012
Mar. 31, 2011
Mar. 31, 2012
Mar. 31, 2011
Operating revenues        
Sales of electricity $ 2,569 $ 2,934 $ 5,109 $ 5,734
Other revenue 35 34 63 62
Total operating revenues 2,604 2,968 5,172 5,796
Operating expenses        
Fuel 524 749 1,164 1,487
Purchased power 329 279 648 639
Operating and maintenance 863 800 1,743 1,683
Depreciation and amortization 493 428 934 860
Tax equivalents 149 145 300 290
Total operating expenses 2,358 2,401 4,789 4,959
Operating income 246 567 383 837
Other income (expense), net (14) 10 (5) 21
Interest expense        
Interest expense 368 356 726 714
Allowance for funds used during construction and nuclear fuel expenditures (42) (32) (81) (61)
Net interest expense 326 324 645 653
Net income (loss) $ (94) $ 253 $ (267) $ 205