Condensed Consolidated Statements of Operations (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Income Statement [Abstract]
Product revenue	$ 604	$ 634
Service revenue	872	884
Total revenue	1,476	1,518
Cost of products	483	476
Cost of services	603	626
Selling, general and administrative expenses	225	245
Research and development expenses	55	63
Restructuring-related charges	15	0
Total operating expenses	1,381	1,410
Income from operations	95	108
Interest expense	(44)	(43)
Other (expense), net	(7)	(7)
(Loss) income from continuing operations before income taxes	44	58
Income tax (benefit) expense	2	4
Income from continuing operations	42	54
Income (loss) from discontinued operations, net of tax	0	0
Net income	42	54
Net income attributable to noncontrolling interests	2	1
Net income attributable to NCR	40	53
Amounts attributable to NCR common stockholders:
Income from continuing operations	40	53
Income (loss) from discontinued operations, net of tax	0	0
Net income	$ 40	$ 53
Income per share attributable to NCR common stockholders:
Basic (in dollars per share)	$ 0.24	$ 0.32
Diluted (in dollars per share)	$ 0.23	$ 0.31
Net income per common share
Basic (in dollars per share)	$ 0.24	$ 0.32
Diluted (in dollars per share)	$ 0.23	$ 0.31
Weighted average common shares outstanding
Basic (in shares)	169.0	167.1
Diluted (in shares)	171.6	171.0