Debt - Interest Income/Expense (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014		Dec. 31, 2013		Dec. 31, 2012
Debt Disclosure [Abstract]
Interest Expense, Debt	$ 400		$ 435		$ 464
Interest Expense	377	[1],[2],[3]	403	[1],[2],[3]	427	[1],[2],[3]
Interest Income	$ 397	[2],[4]	$ 494	[2],[4]	$ 610	[2],[4]

[1] (3)Excludes interest on capital lease obligations related to our ITO business which is held for sale and being reported as a discontinued operation at December 31, 2014. These obligations are expected to be assumed by the purchaser of the ITO business. Refer to Note 4 - Divestitures for additional information regarding this pending sale.

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

[3] 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).

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