Earnings Per Share (Details) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Basic EPS
Income from continuing operations	$ 1,435	$ 1,327	$ 2,824	$ 2,686
Less: Income from continuing operations attributable to noncontrolling interest	(3)		(5)
Income from continuing operations attributable to common stock	1,432	1,327	2,819	2,686
Discontinued operations, net	(1)	(5)	2	(9)
NET INCOME ATTRIBUTABLE TO COMMON STOCK	1,431	1,322	2,821	2,677
Less: Net income allocated to participating securities	(3)	(3)	(4)	(5)
Net income attributable to common stock, net of participating securities	1,428	1,319	2,817	2,672
Weighted average number of basic shares	782.6	804.9	786.9	804.8
Basic EPS (in dollars per share)	$ 1.83	$ 1.64	$ 3.58	$ 3.32
Diluted EPS
Net income attributable to common stock, net of participating securities	$ 1,428	$ 1,319	$ 2,817	$ 2,672
Weighted average number of basic shares	782.6	804.9	786.9	804.8
Dilutive effect of potentially dilutive securities (in shares)	0.3	0.5	0.3	0.5
Total diluted weighted average common shares	782.9	805.4	787.2	805.3
Diluted EPS (in dollars per share)	$ 1.82	$ 1.64	$ 3.58	$ 3.32