Debt, Interest Income and Expense (Details) - USD ($) $ in Millions		3 Months Ended		6 Months Ended
		Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Debt Disclosure [Abstract]
Interest expense(1),(2)	[1],[2]	$ 88	$ 96	$ 177	$ 195
Interest income(3)	[3]	$ 89	$ 101	181	203
ITO [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Disposal Group, Including Discontinued Operation, Interest Expense				$ 2	$ 1

[1] (2)The six months ended June 30, 2015 and 2014 exclude $2 and $1, respectively, of interest on capital lease obligations related to our ITO business, which was reported as a discontinued operation up to 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.