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CONSOLIDATED STATEMENTS OF OPERATIONS (UNAUDITED) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 9 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Operating revenues        
Sales of electricity $ 2,572 $ 2,741 $ 7,830 $ 7,850
Other revenue 30 36 92 99
Total operating revenues 2,602 2,777 7,922 7,949
Operating expenses        
Fuel 652 683 2,118 1,847
Purchased power 263 277 796 925
Operating and maintenance 866 882 2,662 2,625
Depreciation and amortization 412 505 1,248 1,439
Tax equivalents 131 152 404 452
Total operating expenses 2,324 2,499 7,228 7,288
Operating income 278 278 694 661
Other income (expense), net 10 21 36 16
Interest expense        
Interest expense 343 366 1,057 1,092
Allowance for funds used during construction and nuclear fuel expenditures (43) (44) (124) (125)
Net interest expense 300 322 933 967
Net income (loss) $ (12) $ (23) $ (203) $ (290)