Consolidated Statements of Comprehensive Income - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Net income (loss)	$ 564	$ (86)	$ 235
Currency translation adjustments
Currency translation adjustments	(29)	(53)	39
Derivatives
Unrealized gain (loss) on derivatives	6	11	(16)
Gains on derivatives arising during the period	(8)	(7)	(1)
Less income tax benefit (expense)	1	(1)	3
Employee benefit plans
New prior service benefit (cost)	0	(4)	0
Amortization of prior service cost	(6)	(9)	(11)
Net (loss) gain arising during the period	12	12	(13)
Amortization of actuarial (loss) gain	(3)	0	(2)
Less income tax benefit (expense)	1	1	5
Other comprehensive income (loss)	(26)	(50)	4
Total comprehensive income (loss)	538	(136)	239
Less comprehensive income attributable to noncontrolling interests:
Net income	0	2	3
Currency translation adjustments	(3)	(2)	(2)
Amounts attributable to noncontrolling interests	(3)	0	1
Comprehensive income (loss) attributable to NCR common stockholders	$ 541	$ (136)	$ 238