Debt, Interest Income and Expense (Details) - USD ($) $ in Millions		3 Months Ended		9 Months Ended
		Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Debt Disclosure [Abstract]
Interest expense	[1],[2]	$ 88	$ 91	$ 265	$ 286
Interest income	[3]	$ 87	$ 98	268	301
ITO
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Disposal Group, Including Discontinued Operation, Interest Expense				$ 2	$ 2

[1] (2)The nine months ended September 30, 2015 and 2014 exclude $2 and $2, respectively, of interest on capital lease obligations related to our ITO business, which was reported as a discontinued operation through its sale on June 30, 2015. These obligations were assumed by the purchaser of the ITO business. Refer to Note 5 - Divestitures for additional information regarding this sale.

[2] 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.

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