Per Share Data (Diluted EPS Calculation Net Income) (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
Net income attributable to the Company	$ 329	$ 282	$ 676	$ 607
Basic weighted average common shares outstanding (in shares)	545	547	544	545
Diluted weighted average common shares outstanding (in shares)	553	555	552	554
Stock options outstanding	37.3	41.4	37.3	41.4
Net Income [Member]
Net income attributable to the Company	329	282	676	607
Less: Portion attributable to participating securities	0	2	1	4
Net income attributable to common shares for diluted earnings per share	$ 329	$ 280	$ 675	$ 603
Basic weighted average common shares outstanding (in shares)	545	547	544	545
Dilutive effect of potentially issuable common shares	8	8	8	9
Diluted weighted average common shares outstanding (in shares)	553	555	552	554
Average stock price used to calculate common stock equivalents	$ 32.31	$ 30.03	$ 32.13	$ 29.47