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Consolidated Statements of Income - USD ($)
shares in Thousands, $ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Revenues, net $ 2,009 $ 1,923 $ 1,898
Operating expenses:      
Purchased power and fuel 592 617 661
Generation, transmission and distribution 309 286 266
Administrative and other 264 247 241
Depreciation and amortization 345 321 305
Taxes other than income taxes 123 119 116
Total operating expenses 1,633 1,590 1,589
Income from operations 376 333 309
Interest expense, net 120 112 114
Other income:      
Allowance for equity funds used during construction 12 21 21
Miscellaneous income, net 5 1 1
Other income, net 17 22 22
Income before income taxes 273 243 217
Income tax expense 86 50 45
Net income $ 187 $ 193 $ 172
Weighted-average shares outstanding (in thousands):      
Basic 89,056 88,896 84,180
Diluted 89,176 89,054 84,341
Earnings per share:      
Basic $ 2.10 $ 2.17 $ 2.05
Diluted $ 2.10 $ 2.16 $ 2.04