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CONSOLIDATED STATEMENTS OF OPERATIONS (UNAUDITED) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Operating revenues        
Sales of Electricity $ 2,491 $ 2,216 $ 7,294 $ 7,237
Other revenue 36 35 109 113
Revenues 2,527 2,251 7,403 7,350
Operating expenses        
Fuel 428 312 1,210 1,164
Purchased power 251 209 682 680
Operating and maintenance 747 681 2,106 2,014
Depreciation and amortization 385 389 1,144 1,430
Tax equivalents 126 125 371 388
Total operating expenses 1,937 1,716 5,513 5,676
Operating income 590 535 1,890 1,674
Other income (expense), net 11 16 37 27
Defined Benefit Plan, Other Cost (Credit) 65 63 194 190
Interest expense        
Interest expense 267 283 824 859
Net income (loss) $ 269 $ 205 $ 909 $ 652