Earnings Per Share (Details) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Basic EPS
Income from continuing operations	$ 1,332	$ 1,819	$ 2,892	$ 3,224
Discontinued operations, net	(4)	(2)	(5)	142
NET INCOME	1,328	1,817	2,887	3,366
Less: Net income allocated to participating securities	(2)	(3)	(4)	(6)
Net income, net of participating securities	1,326	1,814	2,883	3,360
Weighted average number of basic shares	810.3	812.5	810.4	812.5
Basic EPS (in dollars per share)	$ 1.64	$ 2.23	$ 3.55	$ 4.14
Diluted EPS
Net income, net of participating securities	$ 1,326	$ 1,814	$ 2,883	$ 3,360
Weighted average number of basic shares	810.3	812.5	810.4	812.5
Dilutive effect of potentially dilutive securities (in shares)	0.7	0.8	0.8	0.8
Total diluted weighted average common shares	811.0	813.3	811.2	813.3
Diluted EPS (in dollars per share)	$ 1.64	$ 2.23	$ 3.55	$ 4.13