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Earnings Per Share Of Common Stock (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
 3 Months Ended 6 Months Ended
Jan. 31, 2018
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Earnings Per Share [Abstract]          
Amount of beneficial conversion $ 296     $ 296 $ 0
EPS of Common Stock          
Income from continuing operations   $ 267 $ 219 444 476
Less: Preferred dividends   0 0 (43) 0
Less: Amortization of beneficial conversion feature   (148) 0 (261) 0
Less: Undistributed earnings allocated to preferred shareholders   (13) 0 0 0
Income from continuing operations available to common stockholders   106 219 140 476
Discontinued operations, net of tax [1]   32 (45) 1,224 (97)
Less: Undistributed earnings allocated to preferred shareholders   (4) 0 0 0
Income (loss) from discontinued operations available to common stockholders   28 (45) 1,224 (97)
NET INCOME ATTRIBUTABLE TO COMMON STOCKHOLDERS   $ 134 $ 174 $ 1,364 $ 379
Share Count information:          
Weighted average number of basic shares outstanding (in shares)   477 444 477 443
Assumed exercise of dilutive stock options and awards (in shares)   2 1 1 1
Weighted average number of diluted shares outstanding   479 445 478 444
Income available to common stockholders, per common share:          
Income from continuing operations, basic (in dollars per share)   $ 0.22 $ 0.49 $ 0.29 $ 1.07
Discontinued operations, basic (in dollars per share)   0.06 (0.10) 2.57 (0.21)
Basic - Net Income Attributable to Common Stockholders (in dollars per share)   0.28 0.39 2.86 0.86
Income from continuing operations, diluted (in dollars per share)   0.22 0.49 0.29 1.07
Discontinued operations, diluted (in dollars per share)   0.06 (0.10) 2.56 (0.22)
Diluted - Net Income Attributable to Common Stockholders (in dollars per share)   $ 0.28 $ 0.39 $ 2.85 $ 0.85
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 1 1 1
Preferred Stock          
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]          
Shares excluded from the calculation of diluted shares outstanding, in shares   59   59  
[1] Net of income tax benefits of $30 million and $15 million for the three months ended June 30, 2018 and 2017, respectively, and income tax benefits of $920 million and $41 million for the six months ended June 30, 2018 and 2017, respectively.