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CONSOLIDATED STATEMENTS OF OPERATIONS (UNAUDITED) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Operating revenues        
Revenue from sales of electricity $ 2,669 $ 2,532 $ 7,931 $ 7,548
Other revenue 38 39 117 116
Total operating revenues 2,707 2,571 8,048 7,664
Operating expenses        
Fuel 503 470 1,473 1,541
Purchased power 238 273 731 759
Operating and maintenance 668 719 2,074 2,159
Depreciation and amortization 404 423 1,263 1,298
Tax equivalents 129 125 379 383
Total operating expenses 1,942 2,010 5,920 6,140
Operating income 765 561 2,128 1,524
Other income (expense), net 11 12 34 39
Interest expense        
Interest expense 306 340 942 1,017
Net income (loss) $ 470 $ 233 $ 1,220 $ 546