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Condensed Consolidated Statements of Income and Comprehensive Income (Unaudited) - USD ($)
shares in Thousands, $ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Revenues, net $ 450 $ 423 $ 923 $ 916
Operating expenses:        
Purchased power and fuel 148 142 309 326
Generation, transmission and distribution 66 67 128 121
Administrative and other 60 56 120 110
Depreciation and amortization 76 73 151 148
Taxes other than income taxes 28 27 58 55
Total operating expenses 378 365 766 760
Income from operations 72 58 157 156
Interest expense, net 28 23 58 48
Other income:        
Allowance for equity funds used during construction 5 9 9 15
Miscellaneous income, net 1 1 2 0
Other income, net 6 10 11 15
Income before income tax expense 50 45 110 123
Income tax expense 15 10 25 30
Net income and Comprehensive income $ 35 $ 35 $ 85 $ 93
Weighted-average shares outstanding (in thousands):        
Basic 80,745 78,183 79,515 78,154
Diluted 80,745 80,051 79,515 79,742
Earnings per share:        
Basic $ 0.44 $ 0.44 $ 1.07 $ 1.19
Diluted 0.44 0.43 1.07 1.16
Dividends declared per common share $ 0.300 $ 0.280 $ 0.580 $ 0.555