Per Share Data (Basic EPS Calculation Net Income) (Details) (USD $) In Millions, 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
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 basic earnings per share	$ 329	$ 280	$ 675	$ 603
Basic weighted average common shares outstanding (in shares)	545	547	544	545