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CONSOLIDATED STATEMENTS OF OPERATIONS (UNAUDITED) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Mar. 31, 2019
Mar. 31, 2018
Operating revenues        
Sales of Electricity $ 2,712 $ 2,753 $ 5,393 $ 5,262
Other revenue 38 39 82 79
Revenues 2,750 2,792 5,475 5,341
Operating expenses        
Fuel 501 495 942 970
Purchased power 255 273 552 493
Operating and maintenance 800 632 1,545 1,278
Depreciation and amortization 466 436 811 859
Tax equivalents 136 126 268 250
Total operating expenses 2,158 1,962 4,118 3,850
Operating income 592 830 1,357 1,491
Other income (expense), net 14 11 38 23
Defined Benefit Plan, Other Cost (Credit) 65 65 129 128
Interest expense        
Interest expense 300 314 602 636
Net income (loss) $ 241 $ 462 $ 664 $ 750