Stockholders' Equity Stockholders' Equity (Schedule of Components of Other Comprehensive Income / (Loss)) (Narrative) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Accumulated Other Comprehensive Income (Loss) [Line Items]
Tax (expense) benefit recorded in Stockholders' Equity	$ (1,617)	$ (70)	$ 1,365
Tax benefits associated with stock compensation programs	$ 48	$ 51	$ 43