Condensed Consolidated Statements of Comprehensive Income - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ 74	$ (343)	$ 106	$ (301)
Currency translation adjustments
Currency translation adjustments	(18)	26	(26)	(2)
Derivatives
Unrealized gain (loss) on derivatives	2	(2)	0	7
(Gains) losses on derivatives arising during the period	1	(1)	2	(2)
Less income tax benefit expense	(1)	1	0	(1)
Employee benefit plans
Amortization of prior service benefit	(5)	(5)	(10)	(11)
Amortization of actuarial loss	(1)	0	(1)	1
Less income tax benefit	2	2	3	4
Other comprehensive loss	(20)	21	(32)	(4)
Total comprehensive income (loss)	54	(322)	74	(305)
Less comprehensive income attributable to noncontrolling interests:
Net income	(2)	1	(2)	3
Currency translation adjustments	(2)	0	(6)	(3)
Amounts attributable to noncontrolling interests	(4)	1	(8)	0
Comprehensive (loss) income attributable to NCR common stockholders	$ 58	$ (323)	$ 82	$ (305)