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CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($)
$ in Millions
 12 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2013
Operating revenues      
Revenue from sales of electricity $ 10,847 $ 10,999 $ 10,829
Other revenue 156 138 127
Total operating revenues 11,003 11,137 10,956
Operating expenses      
Fuel 2,444 2,730 2,820
Purchased power 950 1,094 1,027
Operating and maintenance 2,838 3,341 3,428
Depreciation and amortization 2,031 1,843 1,680
Tax equivalents 525 540 548
Total operating expenses 8,788 9,548 9,503
Operating income 2,215 1,589 1,453
Other income (expense), net 29 49 44
Interest expense      
Interest expense 1,347 1,344 1,394
Allowance for funds used during construction (214) (175) (168)
Net interest expense 1,133 1,169 1,226
Net income (loss) $ 1,111 $ 469 $ 271