Quarterly Information (unaudited) (Tables)

12 Months Ended

Dec. 31, 2015

Quarterly Financial Information Disclosure [Abstract]

Schedule of Quarterly Financial Information [Table Text Block]

In millions, except per share amounts	First		Second			Third			Fourth
2015
Total revenue	$	1,476	$	1,604		$	1,613		$	1,680
Gross margin	390		146			457			476
Operating income (loss)	95		(266		)	168			138
Income (loss) from continuing operations (attributable to NCR)	40		(344		)	102			44
(Loss) from discontinued operations, net of tax	—		—			(4		)	(20		)
Net income (loss) attributable to NCR	$	40	$	(344	)	$	98		$	24
Income (loss) per share attributable to NCR common stockholders:
Income (loss) per common share from continuing operations
Basic	$	0.24	$	(2.03	)	$	0.60		$	0.27
Diluted	$	0.23	$	(2.03	)	$	0.59		$	0.27
Net income per common share:
Basic	$	0.24	$	(2.03	)	$	0.58		$	0.15
Diluted	$	0.23	$	(2.03	)	$	0.57		$	0.15
2014
Total revenue	$	1,518	$	1,658		$	1,647		$	1,768
Gross margin	416		480			404			432
Operating income	108		169			41			35
Income from continuing operations (attributable to NCR)	53		90			—			38
Income (loss) from discontinued operations, net of tax	—		—			15			(5		)
Net income attributable to NCR	$	53	$	90		$	15		$	33
Income per share attributable to NCR common stockholders:
Income per common share from continuing operations
Basic	$	0.32	$	0.54		$	—		$	0.23
Diluted	$	0.31	$	0.53		$	—		$	0.22
Net income per common share:
Basic	$	0.32	$	0.54		$	0.09		$	0.20
Diluted	$	0.31	$	0.53		$	0.09		$	0.19