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Net Income Attributable to Company Per Share - Computation of Weighted Average Basic and Diluted Shares Outstanding (Detail) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
 3 Months Ended 9 Months Ended
May. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Numerator:          
Income from continuing operations   $ 155 $ 699 $ 754 $ 1,855
Income from discontinued operations $ 52       52
Net income attributable to Company   $ 155 $ 699 $ 754 $ 1,907
Denominator:          
Basic-weighted average common shares outstanding   380 429 392 428
Dilutive effect of employee stock options and other unvested stock awards   1 2 1 2
Diluted outstanding shares   381 431 393 430
Basic:          
Income from continuing operations   $ 0.41 $ 1.63 $ 1.92 $ 4.34
Income from discontinued operations         0.12
Net income attributable to Company   0.41 1.63 1.92 4.46
Diluted:          
Income from continuing operations   0.41 1.62 1.92 4.31
Income from discontinued operations         0.12
Net income attributable to Company   0.41 1.62 1.92 4.43
Cash dividends per share   $ 0.46 $ 0.46 $ 1.38 $ 1.18