Earnings Per Share (Details) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Basic EPS
Income from continuing operations	$ 1,379	$ 1,775	$ 4,271	$ 4,999
Discontinued operations, net	(4)	(4)	(9)	138
NET INCOME	1,375	1,771	4,262	5,137
Less: Net income allocated to participating securities	(3)	(4)	(8)	(8)
Net income, net of participating securities	1,372	1,767	4,254	5,129
Weighted average number of basic shares	809.7	812.5	810.1	812.6
Basic EPS (in dollars per share)	$ 1.69	$ 2.17	$ 5.25	$ 6.31
Diluted EPS
Net income, net of participating securities	$ 1,372	$ 1,767	$ 4,254	$ 5,129
Weighted average number of basic shares	809.7	812.5	810.1	812.6
Dilutive effect of potentially dilutive securities (in shares)	0.7	0.7	0.7	0.7
Total diluted weighted average common shares	810.4	813.2	810.8	813.3
Diluted EPS (in dollars per share)	$ 1.69	$ 2.17	$ 5.25	$ 6.31