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CONSOLIDATED STATEMENTS OF OPERATIONS (UNAUDITED) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 9 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Operating revenues        
Sales of electricity $ 2,618 $ 2,572 $ 7,869 $ 7,830
Other revenue 33 30 102 92
Total operating revenues 2,651 2,602 7,971 7,922
Operating expenses        
Fuel 698 652 1,904 2,118
Purchased power 279 263 843 796
Operating and maintenance 880 866 2,480 2,662
Depreciation and amortization 463 412 1,357 1,248
Tax equivalents 133 131 395 404
Total operating expenses 2,453 2,324 6,979 7,228
Operating income 198 278 992 694
Other income (expense), net 10 10 37 36
Interest expense        
Interest expense 334 343 1,009 1,057
Allowance for funds used during construction and nuclear fuel expenditures (45) (43) (127) (124)
Net interest expense 289 300 882 933
Net income (loss) $ (81) $ (12) $ 147 $ (203)