Debt Interest Income and Expense (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2014		Mar. 31, 2013
Debt Disclosure [Abstract]
Interest expense	$ 100	[1]	$ 104	[1]
Interest income	$ 102	[2]	$ 120	[2]

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

[2] Includes Finance income, as well as other interest income that is included in Other expenses, net in the Condensed Consolidated Statements of Income.