Per Share Data (Diluted EPS Calculation Net Income) (Details) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Net income attributable to the Company	$ 241	$ 130	$ 917	$ 737
Basic weighted average common shares outstanding (in shares)	544	540	544	543
Diluted weighted average common shares outstanding (in shares)	552	549	552	552
Stock options outstanding	35.1	40.5	35.1	40.5
Net Income [Member]
Net income attributable to the Company	241	130	917	737
Less: Portion attributable to participating securities	0	1	2	5
Net income attributable to common shares for diluted earnings per share	$ 241	$ 129	$ 915	$ 732
Basic weighted average common shares outstanding (in shares)	544	540	544	543
Dilutive effect of potentially issuable common shares	8	9	8	9
Diluted weighted average common shares outstanding (in shares)	552	549	552	552
Average stock price used to calculate common stock equivalents	$ 33.53	$ 28.87	$ 32.60	$ 29.27