Earnings Per Share (Details) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Basic EPS
Income from continuing operations	$ 1,588	$ 1,379	$ 4,274	$ 4,271
Discontinued operations, net	(5)	(4)	(14)	(9)
NET INCOME	1,583	1,375	4,260	4,262
Less: Net income allocated to participating securities	(4)	(3)	(9)	(8)
Net income, net of participating securities	1,579	1,372	4,251	4,254
Weighted average number of basic shares	805.1	809.7	804.8	810.1
Basic EPS (in dollars per share)	$ 1.96	$ 1.69	$ 5.28	$ 5.25
Diluted EPS
Net income, net of participating securities	$ 1,579	$ 1,372	$ 4,251	$ 4,254
Weighted average number of basic shares	805.1	809.7	804.8	810.1
Dilutive effect of potentially dilutive securities (in shares)	0.6	0.7	0.6	0.7
Total diluted weighted average common shares	805.7	810.4	805.4	810.8
Diluted EPS (in dollars per share)	$ 1.96	$ 1.69	$ 5.28	$ 5.25