Condensed Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ 64	$ 88	$ 88	$ 126
Currency translation adjustments
Currency translation gains (losses)	17	(8)	(44)	11
Derivatives
Unrealized gains (losses) on derivatives	(3)	0	0	1
Gains on derivatives recognized during the period	0	(2)	(1)	(3)
Less income tax	1	1	0	1
Employee benefit plans
Amortization of prior service benefit	(1)	(2)	(2)	(4)
Amortization of actuarial losses (gains)	(1)	0	(2)	(1)
Less income tax	1	0	2	0
Other comprehensive income (loss)	14	(11)	(47)	5
Total comprehensive income (loss)	78	77	41	131
Less comprehensive income attributable to noncontrolling interests:
Net income (loss)	0	0	1	1
Currency translation adjustments	0	0	(1)	0
Amounts attributable to noncontrolling interests	0	0	0	1
Comprehensive income (loss) attributable to NCR	$ 78	$ 77	$ 41	$ 130