Condensed Consolidated Statements of Operations (Unaudited) - USD ($) shares in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Total revenue	$ 1,484,000,000	$ 1,710,000,000	$ 2,987,000,000	$ 3,246,000,000
Selling, general and administrative expenses	234,000,000	252,000,000	489,000,000	504,000,000
Research and development expenses	49,000,000	62,000,000	114,000,000	121,000,000
Total operating expenses	1,395,000,000	1,553,000,000	2,821,000,000	2,989,000,000
Operating Income (Loss)	89,000,000	157,000,000	166,000,000	257,000,000
Interest expense	(57,000,000)	(45,000,000)	(107,000,000)	(90,000,000)
Other expense, net	(2,000,000)	(9,000,000)	(4,000,000)	(17,000,000)
Income (loss) from continuing operations before income taxes	30,000,000	103,000,000	55,000,000	150,000,000
Income tax expense (benefit)	(34,000,000)	15,000,000	(33,000,000)	24,000,000
Income (loss) from continuing operations	64,000,000	88,000,000	88,000,000	126,000,000
Loss from discontinued operations, net of tax	0	0	0	0
Net income (loss)	64,000,000	88,000,000	88,000,000	126,000,000
Net income (loss) attributable to noncontrolling interests	0	0	1,000,000	1,000,000
Net income (loss) attributable to NCR	64,000,000	88,000,000	87,000,000	125,000,000
Amounts attributable to NCR common stockholders:
Income (loss) from continuing operations	64,000,000	88,000,000	87,000,000	125,000,000
Dividends on convertible preferred stock	(7,000,000)	(12,000,000)	(13,000,000)	(25,000,000)
Income (loss) from continuing operations attributable to NCR common stockholders	57,000,000	76,000,000	74,000,000	100,000,000
Loss from discontinued operations, net of tax	0	0	0	0
Net income (loss) attributable to NCR common stockholders	$ 57,000,000	$ 76,000,000	$ 74,000,000	$ 100,000,000
Income (loss) per common share from continuing operations
Basic (in dollars per share)	$ 0.45	$ 0.63	$ 0.58	$ 0.83
Diluted (in dollars per share)	0.44	0.58	0.57	0.81
Net income (loss) per common share
Basic (in dollars per share)	0.45	0.63	0.58	0.83
Diluted (in dollars per share)	$ 0.44	$ 0.58	$ 0.57	$ 0.81
Weighted average common shares outstanding
Basic (in shares)	128.0	120.2	128.0	119.8
Diluted (in shares)	128.9	152.7	129.7	123.0
Product
Total revenue	$ 481,000,000	$ 664,000,000	$ 955,000,000	$ 1,203,000,000
Cost of revenue	411,000,000	539,000,000	802,000,000	992,000,000
Services
Total revenue	1,003,000,000	1,046,000,000	2,032,000,000	2,043,000,000
Cost of revenue	$ 701,000,000	$ 700,000,000	$ 1,416,000,000	$ 1,372,000,000