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Earnings Per Share Of Common Stock (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
 3 Months Ended
Jan. 31, 2018
Mar. 31, 2018
Mar. 31, 2017
Earnings Per Share [Abstract]      
Amount of beneficial conversion $ 296 $ 296 $ 0
Earnings Per Share of Common Stock      
Income from continuing operations   177 257
Less: Preferred dividends   (43) 0
Less: Amortization of beneficial conversion feature   (113) 0
Less: Undistributed earnings allocated to preferred shareholders   0 0
Income from continuing operations available to common stockholders   21 257
Discontinued operations, net of tax   1,192 (52)
Less: Undistributed earnings allocated to preferred shareholders   0 0
Income (loss) from discontinued operations available to common stockholders   1,192 (52)
NET INCOME ATTRIBUTABLE TO COMMON STOCKHOLDERS   $ 1,213 $ 205
Share Count information:      
Weighted average number of basic shares outstanding (in shares)   476 443
Assumed exercise of dilutive stock options and awards (in shares)   2 1
Assumed conversion of preferred stock (in shares)   0 0
Weighted average number of diluted shares outstanding   478 444
Income available to common stockholders, per common share:      
Income from continuing operations, basic (in dollars per share)   $ 0.04 $ 0.58
Discontinued operations, basic (in dollars per share)   2.51 (0.12)
Basic - Net Income Attributable to Common Stockholders (in dollars per share)   2.55 0.46
Income from continuing operations, diluted (in dollars per share)   0.04 0.58
Discontinued operations, diluted (in dollars per share)   2.50 (0.12)
Diluted - Net Income Attributable to Common Stockholders (in dollars per share)   $ 2.54 $ 0.46
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
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