XML 56 R2.htm IDEA: XBRL DOCUMENT v3.5.0.2
CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($)
$ in Millions
 12 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2014
Operating revenues      
Revenue from sales of electricity $ 10,461 $ 10,847 $ 10,999
Other revenue 155 156 138
Total operating revenues 10,616 11,003 11,137
Operating expenses      
Fuel 2,126 2,444 2,730
Purchased power 964 950 1,094
Operating and maintenance 2,842 2,838 3,341
Depreciation and amortization 1,836 2,031 1,843
Tax equivalents 522 525 540
Total operating expenses 8,290 8,788 9,548
Operating income 2,326 2,215 1,589
Other income (expense), net 43 29 49
Interest expense      
Interest expense 1,371 1,347 1,344
Allowance for funds used during construction (235) (214) (175)
Net interest expense 1,136 1,133 1,169
Net income (loss) $ 1,233 $ 1,111 $ 469