Condensed Consolidated Statements of Operations (Unaudited) - USD ($) shares in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Total revenue	$ 1,710,000,000	$ 1,537,000,000	$ 3,246,000,000	$ 3,054,000,000
Selling, general and administrative expenses	252,000,000	261,000,000	504,000,000	506,000,000
Research and development expenses	62,000,000	65,000,000	121,000,000	131,000,000
Asset Impairment Charges	0	183,000,000	0	183,000,000
Total operating expenses	1,553,000,000	1,643,000,000	2,989,000,000	3,051,000,000
Income (loss) from operations	157,000,000	(106,000,000)	257,000,000	3,000,000
Interest expense	(45,000,000)	(41,000,000)	(90,000,000)	(82,000,000)
Other expense, net	(9,000,000)	(9,000,000)	(17,000,000)	(14,000,000)
Income (loss) from continuing operations before income taxes	103,000,000	(156,000,000)	150,000,000	(93,000,000)
Income tax expense (benefit)	15,000,000	(12,000,000)	24,000,000	(5,000,000)
Income (loss) from continuing operations	88,000,000	(144,000,000)	126,000,000	(88,000,000)
Loss from discontinued operations, net of tax	0	(2,000,000)	0	(37,000,000)
Net income (loss)	88,000,000	(146,000,000)	126,000,000	(125,000,000)
Net income (loss) attributable to noncontrolling interests	0	(1,000,000)	1,000,000	0
Net income (loss) attributable to NCR	88,000,000	(145,000,000)	125,000,000	(125,000,000)
Amounts attributable to NCR common stockholders:
Income (loss) from continuing operations	88,000,000	(143,000,000)	125,000,000	(88,000,000)
Dividends on convertible preferred stock	(12,000,000)	(12,000,000)	(25,000,000)	(24,000,000)
Income (loss) from continuing operations attributable to NCR common stockholders	76,000,000	(155,000,000)	100,000,000	(112,000,000)
Loss from discontinued operations, net of tax	0	(2,000,000)	0	(37,000,000)
Net income (loss) attributable to NCR common stockholders	$ 76,000,000	$ (157,000,000)	$ 100,000,000	$ (149,000,000)
Income (loss) per common share from continuing operations
Basic (in dollars per share)	$ 0.63	$ (1.31)	$ 0.83	$ (0.94)
Diluted (in dollars per share)	0.58	(1.31)	0.81	(0.94)
Net income (loss) per common share
Basic (in dollars per share)	0.63	(1.33)	0.83	(1.26)
Diluted (in dollars per share)	$ 0.58	$ (1.33)	$ 0.81	$ (1.26)
Weighted average common shares outstanding
Basic (in shares)	120.2	117.9	119.8	118.6
Diluted (in shares)	152.7	117.9	123.0	118.6
Product
Total revenue	$ 664,000,000	$ 525,000,000	$ 1,203,000,000	$ 1,051,000,000
Cost of revenue	539,000,000	451,000,000	992,000,000	871,000,000
Services
Total revenue	1,046,000,000	1,012,000,000	2,043,000,000	2,003,000,000
Cost of revenue	$ 700,000,000	$ 683,000,000	$ 1,372,000,000	$ 1,360,000,000