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]
Net Income	$ 801	$ 685	$ 1,014	$ 692
Basic weighted average shares outstanding	841	850	843	849
Dilutive effect of share-based awards	9	9	9	7
Diluted weighted average shares outstanding	850	859	852	856
Basic Earnings Per Share	$ 0.95	$ 0.81	$ 1.20	$ 0.81
Diluted Earnings Per Share	$ 0.94	$ 0.80	$ 1.19	$ 0.81