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CONSOLIDATED STATEMENTS OF OPERATIONS (UNAUDITED) - USD ($)
$ in Millions
 3 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Operating revenues    
Revenue from sales of electricity $ 2,246 $ 2,375
Other revenue 34 36
Total operating revenues 2,280 2,411
Operating expenses    
Fuel 480 550
Purchased power 247 233
Operating and maintenance 740 688
Depreciation and amortization 461 452
Tax equivalents 124 124
Total operating expenses 2,052 2,047
Operating income 228 364
Other income (expense), net 12 9
Interest expense    
Interest expense 335 342
Allowance for funds used during construction (58) (50)
Net interest expense 277 292
Net income (loss) $ (37) $ 81