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CONSOLIDATED STATEMENTS OF OPERATIONS (UNAUDITED) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Mar. 31, 2020
Mar. 31, 2019
Operating revenues        
Sales of Electricity $ 2,489 $ 2,712 $ 5,021 $ 5,393
Other revenue 32 38 78 82
Revenues 2,521 2,750 5,099 5,475
Operating expenses        
Fuel 429 501 852 942
Purchased power 252 255 471 552
Operating and maintenance 644 800 1,333 1,545
Depreciation and amortization 457 466 1,041 811
Tax equivalents 132 136 263 268
Total operating expenses 1,914 2,158 3,960 4,118
Operating income 607 592 1,139 1,357
Other income (expense), net (1) 14 11 38
Defined Benefit Plan, Other Cost (Credit) 62 65 127 129
Interest expense        
Interest expense 289 300 576 602
Net income (loss) $ 255 $ 241 $ 447 $ 664