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CONSOLIDATED STATEMENTS OF OPERATIONS (UNAUDITED) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Operating revenues        
Sales of Electricity $ 2,932 $ 2,491 $ 8,318 $ 7,294
Other revenue 38 36 119 109
Revenues 2,970 2,527 8,437 7,403
Operating expenses        
Fuel 539 428 1,563 1,210
Purchased power 465 251 1,208 682
Operating and maintenance 722 747 2,269 2,106
Depreciation and amortization 513 385 1,535 1,144
Tax equivalents 141 126 412 371
Total operating expenses 2,380 1,937 6,987 5,513
Operating income 590 590 1,450 1,890
Other income (expense), net (6) 11 11 37
Defined Benefit Plan, Other Cost (Credit) 64 65 194 194
Interest expense        
Interest expense 264 267 791 824
Net income (loss) $ 256 $ 269 $ 476 $ 909