Segment Reporting - Revenue and Long-lived Assets by Geography (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014		Dec. 31, 2013		Dec. 31, 2012
Segment Reporting Information [Line Items]
Total Revenues	$ 19,540	[1]	$ 20,006	[1]	$ 20,421	[1]
Long-Lived Assets	2,630	[2],[3]	2,874	[2]	3,012	[2]
United States
Segment Reporting Information [Line Items]
Total Revenues	13,041		13,272		13,323
Long-Lived Assets	1,758	[2],[3]	1,870	[2]	1,966	[2]
Europe
Segment Reporting Information [Line Items]
Total Revenues	4,428		4,414		4,599
Long-Lived Assets	632	[2],[3]	761	[2]	784	[2]
Other areas
Segment Reporting Information [Line Items]
Total Revenues	2,071		2,320		2,499
Long-Lived Assets	240	[2],[3]	243	[2]	262	[2]
ITO [Member]
Segment Reporting Information [Line Items]
Long-lived assets held for sale	$ 241

[1] 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).

[2] Long-lived assets are comprised of (i) land, buildings and equipment, net, (ii) equipment on operating leases, net, (iii) internal use software, net and (iv) product software, net.

[3] Long-lived assets at December 31, 2014 includes $241 related to our ITO business which is held for sale and being reported as a discontinued operation at December 31, 2014. Refer to Note 4 - Divestitures for additional information regarding this pending sale.