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CONSOLIDATED STATEMENTS OF OPERATIONS (UNAUDITED) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Operating revenues        
Sales of Electricity $ 2,565 $ 2,669 $ 7,958 $ 7,931
Other revenue 39 38 121 117
Revenues 2,604 2,707 8,079 8,048
Operating expenses        
Fuel 417 503 1,359 1,473
Purchased power 223 238 775 731
Operating and maintenance 744 603 2,289 1,881
Depreciation and amortization 576 404 1,387 1,263
Tax equivalents 128 129 396 379
Total operating expenses 2,088 1,877 6,206 5,727
Operating income 516 830 1,873 2,321
Other income (expense), net 14 11 52 34
Defined Benefit Plan, Other Cost (Credit) 65 65 194 193
Interest expense        
Interest expense 300 306 902 942
Net income (loss) $ 165 $ 470 $ 829 $ 1,220