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CONSOLIDATED STATEMENTS OF OPERATIONS (UNAUDITED) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Mar. 31, 2018
Mar. 31, 2017
Operating revenues        
Revenue from sales of electricity $ 2,753 $ 2,508 $ 5,262 $ 5,016
Other revenue 39 39 79 77
Total operating revenues 2,792 2,547 5,341 5,093
Operating expenses        
Fuel 495 503 970 1,071
Purchased power 273 244 493 486
Operating and maintenance 697 699 1,406 1,440
Depreciation and amortization 436 438 859 875
Tax equivalents 126 129 250 258
Total operating expenses 2,027 2,013 3,978 4,130
Operating income 765 534 1,363 963
Other income (expense), net 11 15 23 27
Interest expense        
Interest expense 314 338 636 677
Net income (loss) $ 462 $ 211 $ 750 $ 313