Debt - Interest Income/Expense (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013		Dec. 31, 2012		Dec. 31, 2011
Debt Disclosure [Abstract]
Interest Expense, Debt	$ 435		$ 464		$ 538
Interest Expense	406	[1],[2]	430	[1],[2]	478	[1],[2]
Interest Income	$ 494	[1]	$ 610	[1]	$ 653	[1]

[1] (1)Includes Equipment financing interest expense, as well as non-financing interest expense included in Other expenses, net in the Consolidated Statements of Income.

[2] Asset information on a segment basis is not disclosed as this information is not separately identified and internally reported to our Chief Operating Decision Maker (CODM).