Condensed Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Statement of Comprehensive Income [Abstract]
Net income	$ 21	$ 57
Currency translation adjustments
Currency translation gains	19	24
Derivatives
Unrealized losses on derivatives	(5)	(4)
Losses (gains) on derivatives recognized during the period	1	(2)
Less income tax benefit	0	2
Employee benefit plans
Amortization of prior service benefit	(2)	(2)
Amortization of actuarial benefit	0	(1)
Less income tax benefit	1	1
Tax Cuts and Jobs Act Reclassification from AOCI to Retained Earnings Tax Effect	1	0
Other comprehensive income	15	18
Total comprehensive income	36	75
Less comprehensive income attributable to noncontrolling interests:
Net income	1	0
Amounts attributable to noncontrolling interests	1	0
Comprehensive income attributable to NCR	$ 35	$ 75