Quarterly Information (unaudited) (Tables)

12 Months Ended

Dec. 31, 2018

Quarterly Financial Information Disclosure [Abstract]

Quarterly Financial Information [Table Text Block]

In millions, except per share amounts	First			Second			Third			Fourth
2018
Total revenue	$	1,517		$	1,537		$	1,550		$	1,801
Gross margin	420			403			410			442
Income from operations	109			(106		)	125			63
Income from continuing operations (attributable to NCR)	55			(143		)	85			(33		)
Income (loss) from discontinued operations, net of tax	(35		)	(2		)	(1		)	(14		)
Net (loss) income attributable to NCR common stockholders	8			(157		)	72			(60		)
Income (loss) per share attributable to NCR common stockholders:
Income (loss) per common share from continuing operations
Basic	$	0.36		$	(1.31	)	$	0.62		$	(0.39	)
Diluted	$	0.35		$	(1.31	)	$	0.57		$	(0.39	)
Net (loss) income per common share:
Basic	$	0.07		$	(1.33	)	$	0.61		$	(0.51	)
Diluted	$	0.06		$	(1.33	)	$	0.56		$	(0.51	)
2017
Total revenue	$	1,478		$	1,593		$	1,663		$	1,782
Gross margin	412			461			472			510
Income from operations	115			175			199			202
Income from continuing operations (attributable to NCR)	57			97			118			(35		)
(Loss) from discontinued operations, net of tax	—			5			—			(10		)
Net income attributable to NCR common stockholders	(17		)	90			106			(56		)
Income per share attributable to NCR common stockholders:
Income 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 income per common share:
Basic	$	(0.14	)	$	0.74		$	0.87		$	(0.46	)
Diluted	$	(0.14	)	$	0.67		$	0.77		$	(0.46	)