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Net Income Attributable to Company Per Share (Details) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Numerator:
Net income attributable to Company	$ 605	$ 481	$ 1,211	$ 888
Denominator:
Basic-weighted average common shares outstanding	425	422	424	421
Dilutive effect of employee stock options and other unvested stock awards	2	3	2	3
Diluted outstanding shares	427	425	426	424
Net income attributable to Company per share:
Basic	$ 1.42	$ 1.14	$ 2.85	$ 2.11
Diluted	$ 1.42	$ 1.13	$ 2.84	$ 2.10
Cash dividends per share	$ 0.12	$ 0.11	$ 0.24	$ 0.22
Net Income Attributable to Company Per Share (Textual) [Abstract]
Anti-dilutive stock options outstanding	5	2	5	3

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Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

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