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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, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Numerator:        
Net income attributable to Company $ 531 $ 605 $ 1,033 $ 1,211
Denominator:        
Basic-weighted average common shares outstanding 426 425 426 424
Dilutive effect of employee stock options and other unvested stock awards 2 2 2 2
Diluted outstanding shares 428 427 428 426
Net income attributable to Company per share:        
Basic $ 1.25 $ 1.42 $ 2.42 $ 2.85
Diluted $ 1.24 $ 1.42 $ 2.41 $ 2.84
Cash dividends per share $ 0.26 $ 0.12 $ 0.39 $ 0.24