Condensed Consolidated Statements of Operations (USD $) In Millions, except Per Share data	3 Months Ended		9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010
Condensed Consolidated Statements of Operations
Product revenue	$ 719	$ 600	$ 1,863	$ 1,655
Service revenue	684	607	1,947	1,757
Total revenue	1,403	1,207	3,810	3,412
Cost of products	581	475	1,511	1,321
Cost of services	529	486	1,526	1,413
Selling, general and administrative expenses	231	173	576	514
Research and development expenses	44	39	126	117
Total operating expenses	1,385	1,173	3,739	3,365
Income from operations	18	34	71	47
Interest expense	(3)	0	(4)	(1)
Other (expense) income, net	(1)	1	4	2
Income from continuing operations before income taxes	14	35	71	48
Income tax expense (benefit) expense	(1)	(45)	8	(35)
Income from continuing operations	15	80	63	83
Income from discontinued operations, net of tax	0	5	1	16
Net income	15	85	64	99
Net income attributable to noncontrolling interests	(1)	2	2	4
Net income attributable to NCR	16	83	62	95
Amounts attributable to NCR common stockholders:
Income from continuing operations	16	78	61	79
Income from discontinued operations, net of tax	0	5	1	16
Net income	$ 16	$ 83	$ 62	$ 95
Income per share attributable to NCR common stockholders:
Basic	$ 0.1	$ 0.49	$ 0.38	$ 0.49
Diluted	$ 0.1	$ 0.48	$ 0.38	$ 0.49
Net income per common share
Basic	$ 0.1	$ 0.52	$ 0.39	$ 0.59
Diluted	$ 0.1	$ 0.51	$ 0.39	$ 0.59
Weighted average common shares outstanding
Basic	157.4	160.1	158.1	160.1
Diluted	160.2	161.5	160.9	161.4