Segment Information - Revenue and Operating Income By Segments (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2015 segment		Mar. 31, 2014
Segment Reporting Information [Line Items]
Number of Reportable Segments	4
Revenue by segment	$ 1,476		$ 1,518
Operating income by segment	146		155
Pension expense	0		(1)
Other adjustments	51	[1]	48	[1]
Income from operations	95		108
Restructuring and other asset-related charges	16		0
Acquisition Related Amortization Costs Included in Other Adjustments	32		30
Acquisiton Related Costs Included In Other Adjustments	2		14
Acquisition Related Purchase Price Adjustments	0		3
Legal Costs for OFAC and FCPA Investigations	1		1
Financial Services [Member]
Segment Reporting Information [Line Items]
Revenue by segment	798	[2]	794	[2]
Operating income by segment	105	[2]	103	[2]
Retail Solutions [Member]
Segment Reporting Information [Line Items]
Revenue by segment	445		490
Operating income by segment	16		36
Hospitality [Member]
Segment Reporting Information [Line Items]
Revenue by segment	148		149
Operating income by segment	18		12
Emerging Industries [Member]
Segment Reporting Information [Line Items]
Revenue by segment	85		85
Operating income by segment	$ 7		$ 4

[1] The following table presents the other adjustments for NCR:In millionsThree months ended March 312015 2014Restructuring plan$16 $—Acquisition-related amortization of intangible assets32 30Acquisition-related costs2 14Acquisition-related purchase price adjustments— 3OFAC and FCPA investigations1 1Total other adjustments$51 $48

[2] {F|ahBzfndlYmZpbGluZ3MtaHJkcmoLEgZYTUxEb2MiXlhCUkxEb2NHZW5JbmZvOmYyZWE5ZjE5MWViMDQ3YjY5NDc5NmY0M2YwNzcyN2JmfFRleHRTZWxlY3Rpb246MzIzRURFNThEMEI5QUY4QkYyMEMxNEREMUE5MTBGRTkM}