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Net Income Attributable to Company Per Share - Computation of Weighted Average Basic and Diluted Shares Outstanding (Detail) (USD $)
In Millions, except Per Share data, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Numerator:        
Income from continuing operations $ 608 $ 494 $ 1,156 $ 955
Income from discontinued operations 11 37 52 78
Net income attributable to Company $ 619 $ 531 $ 1,208 $ 1,033
Denominator:        
Basic-weighted average common shares outstanding 428 426 428 426
Dilutive effect of employee stock options and other unvested stock awards 2 2 2 2
Diluted outstanding shares 430 428 430 428
Basic:        
Income from continuing operations $ 1.42 $ 1.16 $ 2.70 $ 2.24
Income from discontinued operations $ 0.03 $ 0.09 $ 0.12 $ 0.18
Net income attributable to Company $ 1.45 $ 1.25 $ 2.82 $ 2.42
Diluted:        
Income from continuing operations $ 1.42 $ 1.15 $ 2.69 $ 2.23
Income from discontinued operations $ 0.02 $ 0.09 $ 0.12 $ 0.18
Net income attributable to Company $ 1.44 $ 1.24 $ 2.81 $ 2.41
Cash dividends per share $ 0.46 $ 0.26 $ 0.72 $ 0.39