Per Share Data (Diluted EPS Calculation Net Income) (Details) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Net income attributable to the Company	$ 347	$ 325
Basic weighted average common shares outstanding (in shares)	542	544
Diluted weighted average common shares outstanding (in shares)	551	552
Stock options outstanding	38.2	42.4
Net Income [Member]
Net income attributable to the Company	347	325
Less: Portion attributable to participating securities	1	3
Net income attributable to common shares for diluted earnings per share	$ 346	$ 322
Basic weighted average common shares outstanding (in shares)	542	544
Dilutive effect of potentially issuable common shares	9	8
Diluted weighted average common shares outstanding (in shares)	551	552
Average stock price used to calculate common stock equivalents	$ 31.95	$ 28.90