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CONSOLIDATED STATEMENTS OF OPERATIONS (UNAUDITED) - USD ($)
$ in Millions
 3 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Operating revenues    
Sales of Electricity $ 2,270 $ 2,532
Other revenue 34 46
Revenues 2,304 2,578
Operating expenses    
Fuel 369 423
Purchased power 206 219
Operating and maintenance 715 689
Depreciation and amortization 378 584
Tax equivalents 121 131
Total operating expenses 1,789 2,046
Operating income 515 532
Other income (expense), net 15 12
Defined Benefit Plan, Other Cost (Credit) 65 65
Interest expense    
Interest expense 281 287
Net income (loss) $ 184 $ 192