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Condensed Consolidated Statements of Income and Comprehensive Income (Unaudited) - USD ($)
shares in Thousands, $ in Millions
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Revenue, net $ 612 $ 564
Alternative revenue programs, net of amortization (3) 9
Total revenues 609 573
Operating expenses:    
Purchased power and fuel 169 153
Generation, transmission and distribution 80 73
Administrative and other 86 71
Depreciation and amortization 103 108
Taxes other than income taxes 38 35
Total operating expenses 476 440
Income from operations 133 133
Interest expense, net 34 33
Other income:    
Allowance for equity funds used during construction 4 3
Miscellaneous income (loss), net 2 (4)
Other income, net 6 (1)
Income before income tax expense 105 99
Income tax expense 9 18
Net income 96 81
Other comprehensive Income 0 1
Comprehensive Income $ 96 $ 82
Weighted-average common shares outstanding (in thousands):    
Basic 89,556 89,429
Diluted 89,703 89,579
Earnings Per Share, Basic and Diluted $ 1.07 $ 0.91