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Consolidated Statements of Income (Loss) - USD ($)
shares in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
REVENUES:      
Total revenues [1] $ 11,261 $ 10,928 $ 10,700
OPERATING EXPENSES:      
Fuel 538 497 571
Purchased power 3,109 2,926 3,310
Other operating expenses 3,133 2,761 2,579
Provision for depreciation 1,136 1,027 933
Amortization (deferral) of regulatory assets, net (150) 308 297
General taxes 993 940 913
Impairment of assets (Note 1) 0 41 43
Total operating expenses 8,759 8,500 8,646
OPERATING INCOME 2,502 2,428 2,054
OTHER INCOME (EXPENSE):      
Miscellaneous income, net 205 53 44
Pension and OPEB mark-to-market adjustment (144) (102) (102)
Interest expense (1,116) (1,005) (973)
Capitalized financing costs 65 52 55
Total other expense (990) (1,002) (976)
INCOME BEFORE INCOME TAXES 1,512 1,426 1,078
INCOME TAXES 490 1,715 527
INCOME (LOSS) FROM CONTINUING OPERATIONS 1,022 (289) 551
Discontinued operations, net of tax 326 (1,435) (6,728)
NET INCOME (LOSS) 1,348 (1,724) (6,177)
INCOME ALLOCATED TO PREFERRED STOCKHOLDERS (Note 1) 367 0 0
NET INCOME (LOSS) ATTRIBUTABLE TO COMMON STOCKHOLDERS $ 981 $ (1,724) $ (6,177)
EARNINGS (LOSS) PER SHARE OF COMMON STOCK:      
Basic - Continuing Operations, in dollars per share $ 1.33 $ (0.65) $ 1.29
Basic - Discontinued Operations, in dollars per share 0.66 (3.23) (15.78)
Basic - Net Income (Loss) Attributable to Common Stockholders, in dollars per share 1.99 (3.88) (14.49)
Diluted - Continuing Operations, in dollars per share 1.33 (0.65) 1.29
Diluted - Discontinued Operations, in dollars per share 0.66 (3.23) (15.78)
Diluted - Net Income (Loss) Attributable to Common Stockholders, in dollars per share $ 1.99 $ (3.88) $ (14.49)
WEIGHTED AVERAGE NUMBER OF SHARES OUTSTANDING:      
Basic, in shares 492 444 426
Diluted, in shares 494 444 426
Electric Distribution and Electric Generation [Member]      
REVENUES:      
Total revenues $ 8,937 $ 8,685 $ 8,685
Electric Transmission [Member]      
REVENUES:      
Total revenues 1,335 1,307 1,123
Product and Service, Other [Member]      
REVENUES:      
Total revenues $ 989 $ 936 $ 892
[1] Includes excise and gross receipts tax collections of $386 million, $370 million and $378 million in 2018, 2017 and 2016, respectively.