Earnings Per Share (Details) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Basic EPS
Income from continuing operations	$ 1,560	$ 1,405
Discontinued operations, net	(1)	144
NET INCOME	1,559	1,549
Less: Net income allocated to participating securities	(3)	(3)
Net income, net of participating securities	1,556	1,546
Weighted average number of basic shares	810.5	812.6
Basic EPS (in dollars per share)	$ 1.92	$ 1.90
Diluted EPS
Net income, net of participating securities	$ 1,556	$ 1,546
Weighted average number of basic shares	810.5	812.6
Dilutive effect of potentially dilutive securities (in shares)	0.8	0.8
Total diluted weighted average common shares	811.3	813.4
Diluted EPS (in dollars per share)	$ 1.92	$ 1.90