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CONSOLIDATED STATEMENTS OF OPERATIONS (UNAUDITED) - USD ($)
$ in Millions
 3 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Operating revenues    
Revenue from sales of electricity $ 2,508 $ 2,246
Other revenue 38 34
Total operating revenues 2,546 2,280
Operating expenses    
Fuel 568 480
Purchased power 242 247
Operating and maintenance 741 740
Depreciation and amortization 437 461
Tax equivalents 129 124
Total operating expenses 2,117 2,052
Operating income 429 228
Other income (expense), net 12 12
Interest expense    
Interest expense 339 335
Allowance for funds used during construction 0 (58)
Net interest expense 339 277
Net income (loss) $ 102 $ (37)