Per Share Data (Basic EPS Calculation Net Income) (Details) (USD $) In Millions, 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
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 basic earnings per share	$ 241	$ 129	$ 915	$ 732
Basic weighted average common shares outstanding (in shares)	544	540	544	543