Earnings Per Share - Basic Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Numerator:
Income (loss) from continuing operations	$ (124)	$ 69	$ (95)	$ 71
Series A convertible preferred stock dividends	(4)	(4)	(12)	(12)
Income (loss) from continuing operations attributable to NCR common stockholders	(128)	65	(107)	59
Income (loss) from discontinued operations, net of tax	0	0	(1)	5
Net income (loss) attributable to NCR common stockholders	$ (128)	$ 65	$ (108)	$ 64
Denominator:
Weighted average outstanding shares of common stock (in shares)	140.9	137.0	140.3	136.4
Basic earnings per share:
From continuing operations (in dollars per share)	$ (0.91)	$ 0.47	$ (0.76)	$ 0.43
From discontinued operations (in dollars per share)	0	0	(0.01)	0.04
Total basic earnings (loss) per share (in dollars per share)	$ (0.91)	$ 0.47	$ (0.77)	$ 0.47