Condensed Consolidated Statements of Operations (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Income Statement [Abstract]
Product revenue	$ 721	$ 701	$ 2,077	$ 2,111
Service revenue	926	807	2,746	2,342
Total revenue	1,647	1,508	4,823	4,453
Cost of products	547	524	1,554	1,577
Cost of services	696	569	1,969	1,666
Selling, general and administrative expenses	232	217	724	678
Research and development expenses	59	53	186	163
Restructuring-related charges	72	0	72	0
Total operating expenses	1,606	1,363	4,505	4,084
Income from operations	41	145	318	369
Interest expense	(46)	(23)	(135)	(70)
Other (expense), net	(14)	(3)	(24)	(4)
(Loss) income from continuing operations before income taxes	(19)	119	159	295
Income tax (benefit) expense	(19)	19	14	44
Income from continuing operations	0	100	145	251
Income (loss) from discontinued operations, net of tax	15	0	15	(1)
Net income	15	100	160	250
Net income attributable to noncontrolling interests	0	2	2	5
Net income attributable to NCR	15	98	158	245
Amounts attributable to NCR common stockholders:
Income from continuing operations	0	98	143	246
Income (loss) from discontinued operations, net of tax	15	0	15	(1)
Net income	$ 15	$ 98	$ 158	$ 245
Income per share attributable to NCR common stockholders:
Basic (in dollars per share)	$ 0.00	$ 0.59	$ 0.85	$ 1.49
Diluted (in dollars per share)	$ 0.00	$ 0.58	$ 0.84	$ 1.46
Net income per common share
Basic (in dollars per share)	$ 0.09	$ 0.59	$ 0.94	$ 1.48
Diluted (in dollars per share)	$ 0.09	$ 0.58	$ 0.92	$ 1.45
Weighted average common shares outstanding
Basic (in shares)	168.2	166.2	167.7	165.1
Diluted (in shares)	171.3	170.0	171.1	168.8