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Computation of Weighted Average Basic and Diluted Shares Outstanding (Detail) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Numerator:
Net income attributable to Company	$ 612	$ 532	$ 1,823	$ 1,420
Denominator:
Basic-weighted average common shares outstanding	425	422	425	421
Dilutive effect of employee stock options and other unvested stock awards	2	3	1	3
Diluted outstanding shares	427	425	426	424
Net income attributable to Company per share:
Basic	$ 1.44	$ 1.26	$ 4.29	$ 3.37
Diluted	$ 1.43	$ 1.25	$ 4.28	$ 3.35
Cash dividends per share	$ 0.12	$ 0.11	$ 0.36	$ 0.33

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