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CONSOLIDATED STATEMENTS OF OPERATIONS (UNAUDITED) - USD ($)
$ in Millions
 3 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Operating revenues    
Sales of Electricity $ 2,532 $ 2,681
Other revenue 46 44
Revenues 2,578 2,725
Operating expenses    
Fuel 423 441
Purchased power 219 297
Operating and maintenance 689 745
Depreciation and amortization 584 345
Tax equivalents 131 132
Total operating expenses 2,046 1,960
Operating income 532 765
Other income (expense), net 12 24
Defined Benefit Plan, Other Cost (Credit) 65 64
Interest expense    
Interest expense 287 302
Net income (loss) $ 192 $ 423