Condensed Consolidated Statements of Operations (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Income Statement [Abstract]
Product revenue	$ 722	$ 743	$ 1,356	$ 1,410
Service revenue	936	792	1,820	1,535
Total revenue	1,658	1,535	3,176	2,945
Cost of products	531	550	1,007	1,053
Cost of services	647	559	1,273	1,097
Selling, general and administrative expenses	247	232	492	461
Research and development expenses	64	55	127	110
Total operating expenses	1,489	1,396	2,899	2,721
Income from operations	169	139	277	224
Interest expense	(46)	(26)	(89)	(47)
Other (expense) income, net	(3)	(3)	(10)	(1)
Income from continuing operations before income taxes	120	110	178	176
Income tax expense	29	23	33	25
Income from continuing operations	91	87	145	151
Loss from discontinued operations, net of tax	0	0	0	(1)
Net income	91	87	145	150
Net income attributable to noncontrolling interests	1	1	2	3
Net income attributable to NCR	90	86	143	147
Amounts attributable to NCR common stockholders:
Income from continuing operations	90	86	143	148
Loss from discontinued operations, net of tax	0	0	0	(1)
Net income	$ 90	$ 86	$ 143	$ 147
Income per share attributable to NCR common stockholders:
Basic (in dollars per share)	$ 0.54	$ 0.52	$ 0.85	$ 0.90
Diluted (in dollars per share)	$ 0.53	$ 0.51	$ 0.84	$ 0.88
Net income per common share
Basic (in dollars per share)	$ 0.54	$ 0.52	$ 0.85	$ 0.89
Diluted (in dollars per share)	$ 0.53	$ 0.51	$ 0.84	$ 0.87
Weighted average common shares outstanding
Basic (in shares)	167.9	165.2	167.5	164.5
Diluted (in shares)	170.9	168.8	171.0	168.1