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Consolidated Statements of Income - USD ($)
shares in Thousands, $ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Revenue from Contract with Customer, Including Assessed Tax $ 1,988 $ 2,009 $ 1,923
Alternative revenue programs, net of amortization 3 0 0
Total Revenues 1,991 2,009 1,923
Operating expenses:      
Purchased power and fuel 571 592 617
Generation, transmission and distribution 292 309 286
Administrative and other 271 260 240
Depreciation and amortization 382 345 321
Taxes other than income taxes 129 123 119
Total operating expenses 1,645 1,629 1,583
Income from operations 346 380 340
Interest expense, net 124 120 112
Other income:      
Allowance for equity funds used during construction 11 12 21
Miscellaneous income, net (4) 1 (6)
Other income, net 7 13 15
Income before income taxes 229 273 243
Income tax expense 17 86 50
Net income $ 212 $ 187 $ 193
Weighted-average shares outstanding (in thousands):      
Basic 89,215 89,056 88,896
Diluted 89,347 89,176 89,054
Earnings per share:      
Basic $ 2.38 $ 2.10 $ 2.17
Diluted $ 2.37 $ 2.10 $ 2.16