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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 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Numerator:        
Income from continuing operations $ 289 $ 608 $ 599 $ 1,156
Income from discontinued operations   11   52
Net income attributable to Company $ 289 $ 619 $ 599 $ 1,208
Denominator:        
Basic-weighted average common shares outstanding 387 428 397 428
Dilutive effect of employee stock options and other unvested stock awards 1 2 1 2
Diluted outstanding shares 388 430 398 430
Basic:        
Income from continuing operations $ 0.75 $ 1.42 $ 1.51 $ 2.70
Income from discontinued operations   0.03   0.12
Net income attributable to Company 0.75 1.45 1.51 2.82
Diluted:        
Income from continuing operations 0.74 1.42 1.51 2.69
Income from discontinued operations   0.02   0.12
Net income attributable to Company 0.74 1.44 1.51 2.81
Cash dividends per share $ 0.46 $ 0.46 $ 0.92 $ 0.72