Quarterly Information (unaudited) (Tables)

12 Months Ended

Dec. 31, 2017

Quarterly Financial Information Disclosure [Abstract]

Quarterly Financial Information [Table Text Block]

In millions, except per share amounts	First			Second		Third			Fourth
2017
Total revenue	$	1,478		$	1,593	$	1,663		$	1,782
Gross margin	413			463		473			515
Operating income	117			178		200			181
Income (loss) from continuing operations (attributable to NCR)	57			97		118			(35		)
Income (loss) from discontinued operations, net of tax	—			5		—			(10		)
Net (loss) income attributable to NCR common stockholders	(17		)	90		106			(56		)
Income (loss) per share attributable to NCR common stockholders:
Income (loss) per common share from continuing operations
Basic	$	(0.14	)	$	0.70	$	0.87		$	(0.38	)
Diluted	$	(0.14	)	$	0.64	$	0.77		$	(0.38	)
Net (loss) income per common share:
Basic	$	(0.14	)	$	0.74	$	0.87		$	(0.46	)
Diluted	$	(0.14	)	$	0.67	$	0.77		$	(0.46	)
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
(Loss) from discontinued operations, net of tax	—			—		(2		)	(11		)
Net income attributable to NCR common stockholders	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