Condensed Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ 32	$ 89	$ 120	$ 215
Currency translation adjustments
Currency translation gains (losses)	21	(22)	(23)	(11)
Derivatives
Unrealized gains (losses) on derivatives	(5)	4	(5)	5
Losses (gains) on derivatives recognized during the period	3	(2)	2	(5)
Less income tax	1	(1)	1	0
Employee benefit plans
Amortization of prior service benefit	0	(1)	(2)	(5)
Amortization of actuarial losses (gains)	0	0	(2)	(1)
Less income tax	(1)	1	1	1
Other comprehensive income (loss)	19	(21)	(28)	(16)
Total comprehensive income (loss)	51	68	92	199
Less comprehensive income attributable to noncontrolling interests:
Net income (loss)	1	(1)	2	0
Currency translation adjustments	1	(1)	0	(1)
Amounts attributable to noncontrolling interests	2	(2)	2	(1)
Comprehensive income (loss) attributable to NCR	$ 49	$ 70	$ 90	$ 200