Quarterly Information (unaudited) (Tables)

12 Months Ended

Dec. 31, 2012

Quarterly Financial Information Disclosure [Abstract]

Schedule of Quarterly Financial Information [Table Text Block]

In millions, except per share amounts	First			Second			Third			Fourth
2012
Total revenues	$	1,244		$	1,409		$	1,435		$	1,642
Gross margin	298			357			358			332
Operating income (loss)	49			101			89			(7		)
Income (loss) from continuing operations (attributable to NCR)	38			67			58			(23		)
Income (loss) from discontinued operations, net of tax	(9		)	13			(1		)	3
Net income (loss) attributable to NCR	$	29		$	80		$	57		$	(20	)
Income (loss) per share attributable to NCR common stockholders:
Income (loss) per common share from continuing operations
Basic	$	0.24		$	0.42		$	0.36		$	(0.14	)
Diluted	$	0.23		$	0.41		$	0.35		$	(0.14	)
Net income (loss) per common share:
Basic	$	0.18		$	0.50		$	0.36		$	(0.12	)
Diluted	$	0.18		$	0.49		$	0.35		$	(0.12	)
2011
Total revenues	$	1,058		$	1,272		$	1,360		$	1,601
Gross margin	219			279			299			385
Operating income (loss)	20			62			28			102
Income (loss) from continuing operations (attributable to NCR)	19			45			23			59
Income (loss) from discontinued operations, net of tax	(6		)	(12		)	(7		)	(68		)
Net income (loss) attributable to NCR	$	13		$	33		$	16		$	(9	)
Income (loss) per share attributable to NCR common stockholders:
Income (loss) per common share from continuing operations
Basic	$	0.12		$	0.29		$	0.15		$	0.37
Diluted	$	0.12		$	0.28		$	0.14		$	0.37
Net income (loss) per common share:
Basic	$	0.08		$	0.21		$	0.10		$	(0.06	)
Diluted	$	0.08		$	0.21		$	0.10		$	(0.06	)