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Summary of Significant Accounting Policies (Details 4) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2010	Sep. 30, 2010	Jun. 30, 2010	Mar. 31, 2010	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Numerator:
Net income attributable to Company	$ 574	$ 532	$ 481	$ 407	$ 440	$ 404	$ 401	$ 422	$ 1,994	$ 1,667	$ 1,469
Denominator:
Basic-weighted average common shares outstanding									422	417	416
Dilutive effect of employee stock options and other unvested stock awards									2	2	1
Diluted outstanding shares									424	419	417
Net income attributable to Company per share:
Basic	$ 1.36	$ 1.26	$ 1.14	$ 0.97	$ 1.05	$ 0.97	$ 0.96	$ 1.01	$ 4.73	$ 3.99	$ 3.53
Diluted	$ 1.35	$ 1.25	$ 1.13	$ 0.96	$ 1.05	$ 0.96	$ 0.96	$ 1.01	$ 4.70	$ 3.98	$ 3.52
Cash dividends per share	$ 0.12	$ 0.11	$ 0.11	$ 0.11	$ 0.11	$ 0.10	$ 0.10	$ 0.10	$ 0.45	$ 0.41	$ 1.10

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