The total cost of the acquired entity including the cash paid to shareholders of acquired entities, fair value of debt and equity securities issued to shareholders of acquired entities, the fair value of the liabilities assumed, and direct costs of the acquisition.

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Amount of goodwill arising from a business combination, which is the excess of the cost of the acquired entity over the amounts assigned to assets acquired and liabilities assumed.

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The pro forma net Income or Loss for the period as if the business combination or combinations had been completed at the beginning of a period.

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Acquisitions and Divestitures - Acquisitions (Details) (USD $) In Millions, unless otherwise specified				3 Months Ended	6 Months Ended
	Jun. 30, 2012	May 31, 2012 Wyse Sistemas De Informatica [Member]	Jun. 14, 2012 Retail Automation Products [Member]	Jun. 30, 2011 Radiant [Member]	Jun. 30, 2011 Radiant [Member]	Feb. 07, 2012 Hospitality [Member] POS and RDS
Business Acquisition [Line Items]
Business Acquisition, Cost of Acquired Entity, Purchase Price		$ 13	$ 10			$ 1
Business Acquisition, Purchase Price Allocation, Goodwill Amount	24
Business Acquisition, Purchase Price Allocation, Goodwill, Expected Tax Deductible Amount	9
Business Acquisition, Pro Forma Information [Abstract]
Revenue				1,372	2,517
Net income attributable to NCR				$ 34	$ 44