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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 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Earnings        
Income from continuing operations, net of tax $ 427 $ 145 $ 1,289 $ 296
Income from discontinued operations, net of tax 5 89 322 276
Net income $ 432 $ 234 $ 1,611 $ 572
Shares        
Weighted average common shares outstanding, basic 358.6 360.2 358.1 365.9
Dilutive effect of stock compensation plans 3.6 4.5 4.0 4.1
Dilutive effect of warrants 1.9 2.3 2.0 2.6
Weighted average common shares outstanding and dilutive potential common shares 364.1 367.0 364.1 372.6
Earnings Per Share, Basic [Abstract]        
Income from continuing operations, net of tax $ 1.19 $ 0.40 $ 3.60 $ 0.81
Income from discontinued operations, net of tax 0.01 0.25 0.90 0.75
Net income per common share 1.20 0.65 4.50 1.56
Earnings Per Share, Diluted [Abstract]        
Income from continuing operations, net of tax 1.17 0.40 3.54 0.79
Income from discontinued operations, net of tax 0.02 0.24 0.88 0.75
Net income per common share $ 1.19 $ 0.64 $ 4.42 $ 1.54