Quarterly Information (unaudited) (Tables)

12 Months Ended

Dec. 31, 2016

Quarterly Financial Information Disclosure [Abstract]

Schedule of Quarterly Financial Information [Table Text Block]

In millions, except per share amounts	First		Second			Third			Fourth
2016
Total revenue	$	1,444	$	1,620		$	1,677		$	1,802
Gross margin	380		446			477			479
Operating income	101		163			189			146
Income from continuing operations (attributable to NCR)	32		76			107			68
Income (loss) from discontinued operations, net of tax	—		—			(2		)	(11		)
Net income attributable to NCR	$	21	$	63		$	92		$	45
Income per share attributable to NCR common stockholders:
Income per common share from continuing operations
Basic	$	0.16	$	0.51		$	0.76		$	0.45
Diluted	$	0.16	$	0.49		$	0.69		$	0.43
Net income per common share:
Basic	$	0.16	$	0.51		$	0.74		$	0.36
Diluted	$	0.16	$	0.49		$	0.68		$	0.35
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
Income (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 (loss) per common share:
Basic	$	0.24	$	(2.03	)	$	0.58		$	0.15
Diluted	$	0.23	$	(2.03	)	$	0.57		$	0.15