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Organization and Basis of Presentation (Details 3) - USD ($) $ / shares in Units, shares in Millions, $ in Millions |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jan. 31, 2018 | Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Accounting Policies [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Amount of beneficial conversion |  | $ 296 |  |  |  |  |  |  |  |  | $ 0 | $ 296 | $ 0
EPS of Common Stock |  |  |  |  |  |  |  |  |  |  |  |  |
Income (loss) from continuing operations |  |  | $ (181) | $ 389 | $ 341 | $ 355 | $ 134 | $ 399 | $ 308 | $ 181 | 904 | 1,022 | (289)
Less: Preferred dividends |  |  |  |  |  |  |  |  |  |  | (3) | (71) | 0
Less: Amortization of beneficial conversion feature |  |  |  |  |  |  |  |  |  |  | 0 | (296) | 0
Less: Undistributed earnings allocated to preferred shareholders |  |  |  |  |  |  |  |  |  |  | (1) | 0 | 0
Income from continuing operations available to common stockholders |  |  |  |  |  |  |  |  |  |  | 900 | 655 | (289)
Discontinued operations, net of tax | [1] |  |  |  |  |  |  |  |  |  | 8 | 326 | (1,435)
Less: Undistributed earnings allocated to preferred shareholders |  |  |  |  |  |  |  |  |  |  | 0 | 0 | 0
Income (loss) from discontinued operations available to common stockholders |  |  |  |  |  |  |  |  |  |  | 8 | 326 | (1,435)
NET INCOME (LOSS) ATTRIBUTABLE TO COMMON STOCKHOLDERS |  |  | $ (111) | $ 391 | $ 308 | $ 315 | $ 128 | $ (512) | $ 134 | $ 1,213 | 908 | 981 | (1,724)
Income allocated to preferred shareholders, preferred dilutive |  |  |  |  |  |  |  |  |  |  | 4 |  |
Income (loss) attributable to common stockholders, dilutive |  |  |  |  |  |  |  |  |  |  | $ 912 | $ 981 | $ (1,724)
Share Count information: |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted average number of basic shares outstanding (in shares) |  |  |  |  |  |  |  |  |  |  | 535 | 492 | 444
Assumed exercise of dilutive stock options and awards (in shares) |  |  |  |  |  |  |  |  |  |  | 3 | 2 | 0
Assumed conversion of preferred stock (in shares) |  |  |  |  |  |  |  |  |  |  | 4 | 0 | 0
Weighted average number of diluted shares outstanding (in shares) |  |  |  |  |  |  |  |  |  |  | 542 | 494 | 444
Income (loss) available to common stockholders, per common share: |  |  |  |  |  |  |  |  |  |  |  |  |
Income from continuing operations, basic (in dollars per share) |  |  | $ (0.33) | $ 0.72 | $ 0.63 | $ 0.66 | $ 0.24 | $ 0.68 | $ 0.30 | $ 0.05 | $ 1.69 | $ 1.33 | $ (0.65)
Discontinued operations, basic (in dollars per share) |  |  | 0.13 | 0.01 | (0.05) | (0.07) | 0.01 | (1.70) | (0.02) | 2.50 | 0.01 | 0.66 | (3.23)
Basic - Net Income (Loss) Attributable to Common Stockholders (in dollars per share) |  |  | (0.20) | 0.73 | 0.58 | 0.59 | 0.25 | (1.02) | 0.28 | 2.55 | 1.70 | 1.99 | (3.88)
Income from continuing operations, diluted (in dollars per share) |  |  | (0.33) | 0.72 | 0.63 | 0.66 | 0.24 | 0.68 | 0.30 | 0.05 | 1.67 | 1.33 | (0.65)
Discontinued operations, diluted (in dollars per share) |  |  | 0.13 | 0 | (0.05) | (0.07) | 0.01 | (1.70) | (0.02) | 2.49 | 0.01 | 0.66 | (3.23)
Diluted - Net Income (Loss) Attributable to Common Stockholders (in dollars per share) |  |  | $ (0.20) | $ 0.72 | $ 0.58 | $ 0.59 | $ 0.25 | $ (1.02) | $ 0.28 | $ 2.54 | $ 1.68 | $ 1.99 | $ (3.88)
Stock Options |  |  |  |  |  |  |  |  |  |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Antidilutive securities excluded from computation of EPS (in shares) |  |  |  |  |  |  |  |  |  |  | 0 | 1 | 3
Preferred Stock |  |  |  |  |  |  |  |  |  |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Antidilutive securities excluded from computation of EPS (in shares) |  |  |  |  |  |  |  |  |  |  | 26 |  |
[1] | Net of income tax benefit of $5 million, $1,251 million, and $820 million in 2019, 2018 and 2017, respectively.

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