Condensed Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ 24	$ 38
Currency translation adjustments
Currency translation gains (losses)	(61)	19
Derivatives
Unrealized gains on derivatives	3	1
Gains on derivatives recognized during the period	(1)	(1)
Less income tax provision	1
Other Comprehensive Income (Loss), Securities, Available-for-Sale, Unrealized Holding Gain (Loss) Arising During Period, Tax		0
Employee benefit plans
Amortization of prior service benefit	(1)	(2)
Amortization of actuarial losses	(1)	(1)
Less income tax benefit	1	0
Other comprehensive income (loss)	(61)	16
Total comprehensive income (loss)	(37)	54
Less comprehensive income attributable to noncontrolling interests:
Net income (loss)	1	1
Currency translation adjustments	(1)	0
Amounts attributable to noncontrolling interests	0	1
Comprehensive income (loss) attributable to NCR	$ (37)	$ 53