Per Share Data (Diluted EPS Calculation Continuing Operations) (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 from continuing operations	$ 246	$ 133	$ 939	$ 738
Less: Net income attributable to non-controlling interests	6	5	21	18
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
Continuing Operations [Member]
Net income from continuing operations	246	133	939	738
Less: Net income attributable to non-controlling interests	6	5	21	18
Net income attributable to the Company	240	128	918	720
Less: Portion attributable to participating securities	0	1	2	5
Net income attributable to common shares for diluted earnings per share	$ 240	$ 127	$ 916	$ 715
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