Earnings Per Share - Basic Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Numerator:
Income (loss) from continuing operations	$ 35	$ (9)	$ 2	$ 21
Series A convertible preferred stock dividends	(4)	(4)	(8)	(8)
Income (loss) from continuing operations attributable to NCR common stockholders	31	(13)	(6)	13
Income from discontinued operations, net of tax	6	0	5	0
Net income (loss) attributable to NCR common stockholders	$ 37	$ (13)	$ (1)	$ 13
Denominator:
Weighted average outstanding shares of common stock (in shares)	136.6	131.0	136.2	130.5
Basic earnings per share:
From continuing operations (in dollars per share)	$ 0.23	$ (0.10)	$ (0.04)	$ 0.10
From discontinued operations (in dollars per share)	0.04	0	0.03	0
Total basic earnings (loss) per share (in dollars per share)	$ 0.27	$ (0.10)	$ (0.01)	$ 0.10