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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
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.