Condensed Consolidated Statements of Comprehensive Income (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Net income	$ 58	$ 15	$ 168	$ 64
Other comprehensive income (loss):
Currency translation adjustments	18	(20)	5	(11)
Unrealized (loss) gain on derivatives	(6)	2	(10)	(10)
Reclassification of realized (gains) losses arising during the period	(2)	2	(4)	4
Less income tax benefit (expense)	2	(1)	4	1
Unrealized loss on securities	0	0	0	(1)
Employee benefit plans
Prior service benefit during year	0	(2)	0	(2)
Amortization of prior service benefit	(2)	(4)	(12)	(10)
Net (loss) income arising during the year	(98)	20	(98)	20
Actuarial loss included in benefits expense	35	61	98	162
Less income tax benefit (expense)	14	(27)	2	(49)
Total comprehensive income	19	50	153	172
Less comprehensive income attributable to noncontrolling interests:
Net income (loss)	1	(1)	2	2
Currency translation adjustments	0	2	0	3
Amounts attributable to noncontrolling interests	1	1	2	5
Comprehensive income attributable to NCR common stockholders	$ 18	$ 49	$ 151	$ 167