Condensed Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Statement of Comprehensive Income [Abstract]
Net income	$ 38	$ 21
Currency translation adjustments
Currency translation gains	19	19
Derivatives
Unrealized gains (losses) on derivatives	1	(5)
Losses (gains) on derivatives recognized during the period	(1)	1
Less income tax (benefit) provision	0	0
Employee benefit plans
Amortization of prior service benefit	(2)	(2)
Amortization of actuarial (loss) benefit	(1)	1
Less income tax benefit	0	1
Other comprehensive income	16	15
Total comprehensive income	54	36
Less comprehensive income attributable to noncontrolling interests:
Net income	1	1
Amounts attributable to noncontrolling interests	1	1
Comprehensive income attributable to NCR	$ 53	$ 35