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, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Numerator:
Income (loss) from continuing operations	$ 69	$ 12	$ 71	$ 33
Series A convertible preferred stock dividends	(4)	(4)	(12)	(12)
Income (loss) from continuing operations attributable to NCR common stockholders	65	8	59	21
Income from discontinued operations, net of tax	0	0	5	0
Net income (loss) attributable to NCR common stockholders	$ 65	$ 8	$ 64	$ 21
Denominator:
Weighted average outstanding shares of common stock (in shares)	137.0	131.5	136.4	130.8
Basic earnings per share:
From continuing operations (in dollars per share)	$ 0.47	$ 0.06	$ 0.43	$ 0.16
From discontinued operations (in dollars per share)	0	0	0.04	0
Total basic earnings (loss) per share (in dollars per share)	$ 0.47	$ 0.06	$ 0.47	$ 0.16