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CONSOLIDATED STATEMENTS OF OPERATIONS (UNAUDITED) - USD ($)
$ in Millions
 3 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Operating revenues    
Electric revenue $ 2,681 $ 2,509
Other revenue 44 40
Revenues 2,725 2,549
Operating expenses    
Fuel 441 475
Purchased power 297 220
Operating and maintenance 745 646
Depreciation and amortization 345 423
Tax equivalents 132 124
Total operating expenses 1,960 1,888
Operating income 765 661
Other income (expense), net 24 12
Defined Benefit Plan, Other Cost (Credit) 64 63
Interest expense    
Interest expense 302 322
Net income (loss) $ 423 $ 288