Per Share Data (Basic EPS Calculation Continuing Operations) (Details) (USD $) In Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010
Net income from continuing operations	$ 133	$ 128	$ 738	$ 373
Less: Net income attributable to non-controlling interests	5	3	18	13
Basic weighted average common shares outstanding	540	543	543	539
Continuing Operations [Member]
Net income from continuing operations	133	128	738	373
Less: Net income attributable to non-controlling interests	5	3	18	13
Net income from continuing operations attributable to the Company	128	125	720	360
Less: Portion attributable to participating securities	1	3	5	7
Net income attributable to common shares for basic earnings per share	$ 127	$ 122	$ 715	$ 353
Basic weighted average common shares outstanding	540	543	543	539