Condensed Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Statement of Comprehensive Income [Abstract]
Net income	$ 102	$ 74	$ 159	$ 106
Currency translation adjustments
Currency translation gains (losses)	5	(18)	29	(26)
Derivatives
Unrealized (losses) gains on derivatives	(6)	2	(10)	0
(Gains) losses on derivatives recognized during the period	(1)	1	(3)	2
Less income tax benefit (expense)	1	(1)	3	0
Employee benefit plans
Amortization of prior service benefit	(3)	(5)	(5)	(10)
Amortization of actuarial benefit	0	(1)	(1)	(1)
Less income tax benefit	1	2	2	3
Other comprehensive (loss) income	(3)	(20)	15	(32)
Total comprehensive income	99	54	174	74
Less comprehensive income attributable to noncontrolling interests:
Net Income (Loss) Attributable to Noncontrolling Interest	0	(2)	0	(2)
Currency translation losses	0	(2)	0	(6)
Amounts attributable to noncontrolling interests	0	(4)	0	(8)
Comprehensive income attributable to NCR	$ 99	$ 58	$ 174	$ 82