Condensed Consolidated Statements of Comprehensive Income - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ 99	$ 15	$ (202)	$ 160
Currency translation adjustments
Currency translation adjustments	(39)	(47)	(41)	(17)
Derivatives
Unrealized gain (loss) on derivatives	2	1	9	(1)
(Gains) losses on derivatives arising during the period	(1)	1	(3)	4
Less income tax benefit expense	(1)	0	(2)	(1)
Employee benefit plans
Amortization of prior service benefit	(5)	(4)	(16)	(15)
Amortization of actuarial loss	1	0	2	1
Less income tax benefit	1	1	5	5
Other comprehensive loss	(42)	(48)	(46)	(24)
Total comprehensive income (loss)	57	(33)	(248)	136
Less comprehensive income attributable to noncontrolling interests:
Net income	1	0	4	2
Currency translation adjustments	(4)	(2)	(7)	(2)
Amounts attributable to noncontrolling interests	(3)	(2)	(3)	0
Comprehensive (loss) income attributable to NCR common stockholders	$ 60	$ (31)	$ (245)	$ 136