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SCHEDULE I - CONDENSED FINANCIAL INFORMATION OF PARENT - STATEMENT OF OPERATIONS (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Millions | 3 Months Ended | 12 Months Ended
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Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | [1] | Dec. 31, 2016 | [1]
Condensed Income Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |
Interest income |  |  |  |  |  |  |  |  | $ 104 | $ 46 | $ 26
Interest expense |  |  |  |  |  |  |  |  | (925) | (659) | (553)
Other (expense) income, net |  |  |  |  |  |  |  |  | 72 | 233 | 138
Income tax (expense) benefit |  |  |  |  |  |  |  |  | (96) | (1,276) | (389)
Net income | $ 964 | $ 334 | $ (530) | $ 358 | $ (451) | $ 102 | $ 248 | $ 452 | 1,126 | 351 | 1,519
Dividends on preferred stock | (36) |  |  |  |  |  |  |  | $ (125) | $ 0 | $ 0
Earnings attributable to common shares | $ 864 | $ 274 | $ (561) | $ 347 | $ (501) | $ 57 | $ 259 | $ 441 |  |  |
Basic earnings per common share (in dollars per share) | $ 3.51 | $ 1.22 | $ (1.99) | $ 1.39 | $ (1.80) | $ 0.41 | $ 0.99 | $ 1.80 | $ 3.45 | $ 1.02 | $ 5.48
Weighted-average number of shares outstanding, basic (in shares) | 274,300 | 273,900 | 265,800 | 257,900 | 251,900 | 251,700 | 251,400 | 251,100 | 268,072 | 251,545 | 250,217
Diluted earnings per common share (in dollars per share) | $ 3.25 | $ 1.21 | $ (1.99) | $ 1.38 | $ (1.80) | $ 0.41 | $ 0.98 | $ 1.79 | $ 3.42 | $ 1.01 | $ 5.46
Weighted-average number of shares outstanding, diluted (in shares) | 296,400 | 275,900 | 265,800 | 259,500 | 251,900 | 253,400 | 252,800 | 252,200 | 269,852 | 252,300 | 251,155
Parent Company [Member] |  |  |  |  |  |  |  |  |  |  |
Condensed Income Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |
Interest income |  |  |  |  |  |  |  |  | $ 14 | $ 0 | $ 0
Interest expense |  |  |  |  |  |  |  |  | (495) | (293) | (277)
Operation and maintenance |  |  |  |  |  |  |  |  | (82) | (80) | (76)
Other (expense) income, net |  |  |  |  |  |  |  |  | (16) | 100 | (7)
Income tax (expense) benefit |  |  |  |  |  |  |  |  | 154 | 33 | 181
Net of income tax |  |  |  |  |  |  |  |  | (425) | (240) | (179)
Equity in earnings of subsidiaries, net of income taxes |  |  |  |  |  |  |  |  | 1,474 | 496 | 1,549
Net income |  |  |  |  |  |  |  |  | 1,049 | 256 | 1,370
Dividends on preferred stock |  |  |  |  |  |  |  |  | (125) | 0 | 0
Earnings attributable to common shares |  |  |  |  |  |  |  |  | $ 924 | $ 256 | $ 1,370
Basic earnings per common share (in dollars per share) |  |  |  |  |  |  |  |  | $ 3.45 | $ 1.02 | $ 5.48
Weighted-average number of shares outstanding, basic (in shares) |  |  |  |  |  |  |  |  | 268,072 | 251,545 | 250,217
Diluted earnings per common share (in dollars per share) |  |  |  |  |  |  |  |  | $ 3.42 | $ 1.01 | $ 5.46
Weighted-average number of shares outstanding, diluted (in shares) |  |  |  |  |  |  |  |  | 269,852 | 252,300 | 251,155
[1] | As adjusted for the retrospective adoption of ASU 2017-07, which we discuss in Note 2, and a reclassification to conform to current year presentation, which we discuss in Note 1.

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