Condensed Consolidated Statements of Operations (Unaudited) - USD ($) shares in Millions, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Total revenue	$ 1,550	$ 1,663	$ 4,604	$ 4,734
Selling, general and administrative expenses	226	220	732	678
Research and development expenses	59	53	190	178
Asset impairment charges	0	0	183	0
Total operating expenses	1,425	1,464	4,476	4,245
Income from operations	125	199	128	489
Interest expense	(43)	(42)	(125)	(122)
Other (expense), net	(10)	(7)	(24)	(16)
Income (loss) from continuing operations before income taxes	72	150	(21)	351
Income tax (benefit) expense	(15)	31	(20)	78
Income (loss) from continuing operations	87	119	(1)	273
(Loss) income from discontinued operations, net of tax	(1)	0	(38)	5
Net income (loss)	86	119	(39)	278
Net income attributable to noncontrolling interests	2	1	2	1
Net (loss) income attributable to NCR	84	118	(41)	277
Amounts attributable to NCR common stockholders:
Income (loss) from continuing operations	85	118	(3)	272
Series A convertible preferred stock dividends	(12)	(12)	(36)	(36)
Deemed dividend on modification of Series A convertible preferred stock	0	0	0	(4)
Deemed dividend on Series A convertible preferred stock related to redemption	0	0	0	(58)
Income (loss) from continuing operations attributable to NCR common stockholders	73	106	(39)	174
(Loss) income from discontinued operations, net of tax	(1)	0	(38)	5
Net income (loss) attributable to NCR common stockholders	$ 72	$ 106	$ (77)	$ 179
Income (loss) per common share from continuing operations
Basic earnings from continuing operations (in dollars per share)	$ 0.62	$ 0.87	$ (0.33)	$ 1.43
Income (Loss) from Continuing Operations, Per Diluted Share	0.57	0.77	(0.33)	1.37
Net income (loss) per common share
Basic (in dollars per share)	0.61	0.87	(0.65)	1.47
Diluted (in dollars per share)	$ 0.56	$ 0.77	$ (0.65)	$ 1.41
Weighted average common shares outstanding
Weighted average outstanding shares of common stock (in shares)	118.0	121.5	118.4	121.9
Diluted (in shares)	149.3	153.1	118.4	126.9
Product
Total revenue	$ 534	$ 657	$ 1,585	$ 1,829
Cost of products	473	528	1,344	1,430
Service
Total revenue	1,016	1,006	3,019	2,905
Cost of products	$ 667	$ 663	$ 2,027	$ 1,959