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Organization and Basis of Presentation (Details 2) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
 3 Months Ended 12 Months Ended
Jan. 31, 2018
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
Dec. 31, 2016
Accounting Policies [Abstract]                        
Amount of beneficial conversion $ 296                 $ 296 $ 0 $ 0
EPS of Common Stock                        
Income (loss) from continuing operations   $ 182 $ 387 $ 288 $ 165 $ (1,061) $ 301 $ 220 $ 251 1,022 (289) 551
Less: Preferred dividends                   (71) 0 0
Less: Amortization of beneficial conversion feature                   (296) 0 0
Less: Undistributed earnings allocated to preferred shareholders                   0 0 0
Income from continuing operations available to common stockholders                   655 (289) 551
Discontinued operations, net of tax                   326 (1,435) (6,728)
Less: Undistributed earnings allocated to preferred shareholders                   0 0 0
Income (loss) from discontinued operations available to common stockholders                   326 (1,435) (6,728)
NET INCOME (LOSS) ATTRIBUTABLE TO COMMON STOCKHOLDERS   $ 128 $ (512) $ 134 $ 1,213 $ (2,499) $ 396 $ 174 $ 205 $ 981 $ (1,724) $ (6,177)
Share Count information:                        
Weighted average number of basic shares outstanding (in shares)                   492 444 426
Assumed exercise of dilutive stock options and awards (in shares)                   2 0 0
Weighted average number of diluted shares outstanding                   494 444 426
Income (loss) available to common stockholders, per common share:                        
Income from continuing operations, basic (in dollars per share)   $ 0.34 $ 0.66 $ 0.27 $ 0.01 $ (2.39) $ 0.68 $ 0.49 $ 0.57 $ 1.33 $ (0.65) $ 1.29
Discontinued operations, basic (in dollars per share)   (0.09) (1.68) 0.01 2.54 (3.23) 0.21 (0.10) (0.11) 0.66 (3.23) (15.78)
Basic - Net Income (Loss) Attributable to Common Stockholders, in dollars per share   0.25 (1.02) 0.28 2.55 (5.62) 0.89 0.39 0.46 1.99 (3.88) (14.49)
Income from continuing operations, diluted (in dollars per share)   0.34 0.66 0.27 0.01 (2.39) 0.68 0.49 0.57 1.33 (0.65) 1.29
Discontinued operations, diluted (in dollars per share)   (0.09) (1.68) 0.01 2.53 (3.23) 0.21 (0.10) (0.11) 0.66 (3.23) (15.78)
Diluted - Net Income (Loss) Attributable to Common Stockholders, in dollars per share   $ 0.25 $ (1.02) $ 0.28 $ 2.54 $ (5.62) $ 0.89 $ 0.39 $ 0.46 $ 1.99 $ (3.88) $ (14.49)
Stock Options                        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]                        
Shares excluded from the calculation of diluted shares outstanding, in shares                   1 3 3
Preferred Stock                        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]                        
Shares excluded from the calculation of diluted shares outstanding, in shares                   26