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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, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Revenue, net $ 545 $ 469 $ 1,157 $ 1,033
Alternative revenue programs, net of amortization (8) 0 (11) 9
Total revenues 537 469 1,146 1,042
Operating expenses:        
Purchased power and fuel 185 109 354 262
Generation, transmission and distribution 76 77 156 150
Administrative and other 79 74 165 145
Depreciation and amortization 101 104 204 212
Taxes other than income taxes 35 34 73 69
Total operating expenses 476 398 952 838
Income from operations 61 71 194 204
Interest expense, net 33 34 67 67
Other income:        
Allowance for equity funds used during construction 5 4 9 7
Miscellaneous income (loss), net 3 3 5 (1)
Other income, net 8 7 14 6
Income before income tax expense 36 44 141 143
Income tax expense 4 5 13 23
Net income 32 39 128 120
Other comprehensive Income 0 0 0 1
Comprehensive Income $ 32 $ 39 $ 128 $ 121
Weighted-average common shares outstanding (in thousands):        
Basic 89,554 89,489 89,555 89,459
Diluted 89,672 89,625 89,687 89,602
Basic $ 0.36 $ 0.44 $ 1.43 $ 1.34
Diluted $ 0.36 $ 0.43 $ 1.43 $ 1.34