Consolidated Statements of Operations (USD $) In Millions, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Product revenue	$ 2,854	$ 2,592	$ 2,301
Service revenue	2,876	2,699	2,410
Total revenue	5,730	5,291	4,711
Cost of products	2,177	2,011	1,799
Cost of services	2,208	2,098	1,922
Selling, general and administrative expenses	894	794	685
Research and development expenses	219	176	156
Total operating expenses	5,498	5,079	4,562
Income from operations	232	212	149
Interest expense	(42)	(13)	(2)
Other (expense) income, net	(8)	(3)	(11)
Income from continuing operations before income taxes	182	196	136
Income tax expense (benefit)	42	51	(11)
Income from continuing operations	140	145	147
Income (loss) from discontinued operations, net of tax	6	(93)	(10)
Net income	146	52	137
Net (loss) income attributable to noncontrolling interests	0	(1)	3
Net income attributable to NCR	146	53	134
Amounts attributable to NCR common stockholders:
Income from continuing operations	140	146	144
Income (loss) from discontinued operations, net of tax	6	(93)	(10)
Net income (loss) attributable to NCR common stockholders	$ 146	$ 53	$ 134
Net income per common share from continuing operations
Basic (in dollars per share)	$ 0.88	$ 0.92	$ 0.90
Diluted (in dollars per share)	$ 0.85	$ 0.91	$ 0.89
Net income (loss) per common share
Basic (in dollars per share)	$ 0.92	$ 0.34	$ 0.84
Diluted (in dollars per share)	$ 0.89	$ 0.33	$ 0.83
Weighted average common shares outstanding
Basic (in shares)	159.3	158.0	159.8
Diluted (in shares)	163.8	161.0	161.2