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CONSOLIDATED STATEMENTS OF OPERATIONS (UNAUDITED) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Mar. 31, 2016
Mar. 31, 2015
Operating revenues        
Revenue from sales of electricity $ 2,529 $ 2,825 $ 4,775 $ 5,200
Other revenue 42 38 76 74
Total operating revenues 2,571 2,863 4,851 5,274
Operating expenses        
Fuel 484 586 964 1,136
Purchased power 237 259 484 492
Operating and maintenance 669 657 1,409 1,345
Depreciation and amortization 465 454 926 906
Tax equivalents 127 131 251 255
Total operating expenses 1,982 2,087 4,034 4,134
Operating income 589 776 817 1,140
Other income (expense), net 8 8 20 17
Interest expense        
Interest expense 337 341 672 683
Allowance for funds used during construction (58) (53) (116) (103)
Net interest expense 279 288 556 580
Net income (loss) $ 318 $ 496 $ 281 $ 577