Consolidated Statements of Operations - USD ($) shares in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Total revenue	$ 7,156,000,000	$ 6,207,000,000	$ 6,915,000,000
Selling, general and administrative expenses	(1,151,000,000)	(1,069,000,000)	(1,051,000,000)
Research and development expenses	(268,000,000)	(234,000,000)	(259,000,000)
Total operating expenses	6,682,000,000	5,986,000,000	6,304,000,000
Income from operations	474,000,000	221,000,000	611,000,000
Gain (Loss) on Extinguishment of Debt	(42,000,000)	(20,000,000)	0
Interest expense	(238,000,000)	(218,000,000)	(197,000,000)
Other income (expense), net	90,000,000	(42,000,000)	(73,000,000)
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest	284,000,000	(59,000,000)	341,000,000
Income tax expense (benefit)	186,000,000	(53,000,000)	(273,000,000)
Income (loss) from continuing operations	98,000,000	(6,000,000)	614,000,000
Loss (income) from discontinued operations	0	(72,000,000)	(50,000,000)
Net income (loss)	98,000,000	(78,000,000)	564,000,000
Net income attributable to noncontrolling interests	(1,000,000)	(1,000,000)	0
Net income (loss) attributable to NCR	97,000,000	(79,000,000)	564,000,000
Amounts attributable to NCR common stockholders:
Income (loss) from continuing operations	97,000,000	(7,000,000)	614,000,000
Series A convertible preferred stock dividends	(16,000,000)	(31,000,000)	(110,000,000)
Income (loss) from continuing operations attributable to common stockholders	81,000,000	(38,000,000)	504,000,000
Loss (income) from discontinued operations	0	(72,000,000)	(50,000,000)
Net income (loss) attributable to NCR common stockholders	$ 81,000,000	$ (110,000,000)	$ 454,000,000
Income (loss) per share attributable to NCR common stockholders:
Basic (in dollars per share)	$ 0.62	$ (0.30)	$ 4.13
Diluted (in dollars per share)	0.58	(0.30)	3.71
Net income (loss) per common share
Basic (in dollars per share)	0.62	(0.86)	3.72
Diluted (in dollars per share)	$ 0.58	$ (0.86)	$ 3.36
Weighted average common shares outstanding
Basic (in shares)	131.2	128.4	122.1
Diluted (net income)	139.0	128.4	145.2
Product [Member]
Total revenue	$ 2,193,000,000	$ 2,005,000,000	$ 2,681,000,000
Cost of products	1,850,000,000	1,733,000,000	2,146,000,000
Service [Member]
Total revenue	4,963,000,000	4,202,000,000	4,234,000,000
Cost of products	$ 3,413,000,000	$ 2,950,000,000	$ 2,848,000,000