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CONSOLIDATED STATEMENTS OF OPERATIONS (UNAUDITED) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Operating revenues        
Sales of Electricity $ 2,216 $ 2,565 $ 7,237 $ 7,958
Other revenue 35 39 113 121
Revenues 2,251 2,604 7,350 8,079
Operating expenses        
Fuel 312 417 1,164 1,359
Purchased power 209 223 680 775
Operating and maintenance 681 744 2,014 2,289
Depreciation and amortization 389 576 1,430 1,387
Tax equivalents 125 128 388 396
Total operating expenses 1,716 2,088 5,676 6,206
Operating income 535 516 1,674 1,873
Other income (expense), net 16 14 27 52
Defined Benefit Plan, Other Cost (Credit) 63 65 190 194
Interest expense        
Interest expense 283 300 859 902
Net income (loss) $ 205 $ 165 $ 652 $ 829