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Condensed Consolidated Statements of Income and Comprehensive Income (Unaudited) - USD ($)
shares in Thousands, $ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Revenue, net $ 654 $ 556 $ 1,811 $ 1,589
Alternative revenue programs, net of amortization (12) (9) (23) 0
Total revenues 642 547 1,788 1,589
Operating expenses:        
Purchased power and fuel 259 292 613 554
Generation, transmission and distribution 80 65 236 215
Administrative and other 82 63 247 208
Depreciation and amortization 101 108 305 320
Taxes other than income taxes 37 35 110 104
Total operating expenses 559 563 1,511 1,401
Income from operations 83 (16) 277 188
Interest expense, net 33 35 100 102
Other income:        
Allowance for equity funds used during construction 4 4 13 11
Miscellaneous income (loss), net 1 3 6 2
Other income, net 5 7 19 13
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest, Total 55 (44) 196 99
Income tax expense 5 (27) 18 (4)
Net income 50 (17) 178 103
Other comprehensive Income 1 0 1 1
Comprehensive Income $ 51 $ (17) $ 179 $ 104
Weighted-average common shares outstanding (in thousands):        
Basic 89,407 89,509 89,505 89,476
Diluted 89,566 89,509 89,646 89,629
Basic $ 0.56 $ (0.19) $ 1.99 $ 1.16
Diluted $ 0.56 $ (0.19) $ 1.98 $ 1.15