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
Earnings Per Share [Abstract]
Antidilutive securities excluded from computation of earnings per share	4.1	8.4	2.2	4.5
Numerator for earnings per share calculations:
Income from continuing operations	$ 1,246	$ 1,125	$ 2,375	$ 2,079
Loss from discontinued operations, net of tax	0	(1)	0	(1)
Net income	$ 1,246	$ 1,124	$ 2,375	$ 2,078
Denominators for earnings per share calculations:
Weighted averages shares outstanding, basic (in shares)	1,165	1,227	1,172	1,230
Effect of dilutive securities:
Stock options (in shares)	8	8	8	7
Restricted stock units (in shares)	1	1	2	1
Weighted averages shares outstanding, diluted (in shares)	1,174	1,236	1,182	1,238
Earnings Per Share, Basic [Abstract]
Income (Loss) from Continuing Operations, Per Basic Share	$ 1.07	$ 0.92	$ 2.03	$ 1.69
Income (Loss) from Discontinued Operations and Disposal of Discontinued Operations, Net of Tax, Per Basic Share	$ 0.00	$ 0.00	$ 0.00	$ 0.00
Earnings Per Share, Basic	$ 1.07	$ 0.92	$ 2.03	$ 1.69
Diluted earnings per share:
Income (Loss) from Continuing Operations, Per Diluted Share	$ 1.06	$ 0.91	$ 2.01	$ 1.68
Income (Loss) from Discontinued Operations and Disposal of Discontinued Operations, Net of Tax, Per Diluted Share	$ 0.00	$ 0.00	$ 0.00	$ 0.00
Earnings Per Share, Diluted	$ 1.06	$ 0.91	$ 2.01	$ 1.68