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CONSOLIDATED STATEMENTS OF OPERATIONS (UNAUDITED) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Operating revenues        
Revenue from sales of electricity $ 2,522 $ 2,618 $ 7,722 $ 7,869
Other revenue 36 33 110 102
Total operating revenues 2,558 2,651 7,832 7,971
Operating expenses        
Fuel 608 698 1,744 1,904
Purchased power 244 279 736 843
Operating and maintenance 738 880 2,083 2,480
Depreciation and amortization 534 463 1,440 1,357
Tax equivalents 128 133 383 395
Total operating expenses 2,252 2,453 6,386 6,979
Operating income 306 198 1,446 992
Other income (expense), net 8 10 25 37
Interest expense        
Interest expense 337 334 1,020 1,009
Allowance for funds used during construction (55) (45) (158) (127)
Net interest expense 282 289 862 882
Net income (loss) $ 32 $ (81) $ 609 $ 147