Per Share Data (Basic EPS Calculation Net Income) (Details) (USD $) In Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010
Net income attributable to the Company	$ 130	$ 168	$ 737	$ 652
Basic weighted average common shares outstanding	540	543	543	539
Net Income [Member]
Net income attributable to the Company	130	168	737	652
Less: Portion attributable to participating securities	1	3	5	11
Net income attributable to common shares for basic earnings per share	$ 129	$ 165	$ 732	$ 641
Basic weighted average common shares outstanding	540	543	543	539