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Earnings (Loss) Per Common Share - Computation of Basic and Diluted Earnings Per Common Share (Detail) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Earnings        
Income from continuing operations, net of tax $ 372 $ 434 $ 1,002 $ 862
Less: Preferred stock dividends 0 0 5 0
Income from discontinued operations, net of tax, available to common stockholders 372 434 997 862
Income from discontinued operations, net of tax, available to common stockholders 0 148 0 317
Net income available to common stockholders $ 372 $ 582 $ 997 $ 1,179
Shares        
Weighted average common shares outstanding, basic 361.4 358.3 360.7 357.9
Dilutive effect of stock-based awards under compensation plans 3.2 4.0 3.3 4.2
Dilutive effect of warrants [1] 0.5 1.9 0.9 2.0
Weighted average common shares outstanding and dilutive potential common shares 365.1 364.2 364.9 364.1
Earnings Per Share, Basic [Abstract]        
Income from continuing operations, net of tax, available to common stockholders $ 1.03 $ 1.21 $ 2.76 $ 2.41
Income from discontinued operations, net of tax, available to common stockholders 0 0.41 0 0.88
Net income available to common stockholders 1.03 1.62 2.76 3.29
Earnings Per Share, Diluted [Abstract]        
Income from continuing operations, net of tax, available to common stockholders 1.02 1.19 2.73 2.37
Income from discontinued operations, net of tax, available to common stockholders 0 0.41 0 0.87
Net income available to common stockholders $ 1.02 $ 1.60 $ 2.73 $ 3.24