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Net Income Attributable to Company Per Share (Details) (USD $) In Millions, except Per Share data	3 Months Ended		9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010
Numerator:
Net income attributable to Company	$ 532	$ 404	$ 1,420	$ 1,227
Denominator:
Basic-weighted average common shares outstanding	422	417	421	417
Dilutive effect of employee stock options and other unvested stock awards	3	2	3	2
Diluted outstanding shares	425	419	424	419
Net income attributable to Company per share:
Basic	$ 1.26	$ 0.97	$ 3.37	$ 2.94
Diluted	$ 1.25	$ 0.96	$ 3.35	$ 2.93
Cash dividends per share	$ 0.11	$ 0.10	$ 0.33	$ 0.30
Net Income Attributable to Company Per Share (Textuals) [Abstract]
Anti-dilutive stock options outstanding	2	6	3	6

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Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic net Income or Loss per outstanding limited partnership unit in the future and that were not included in the computation of diluted net income per limited partnership unit, because to do so would increase net income per unit amounts or decrease loss per unit amounts for the period presented.

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