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Acquisitions and Divestitures - Acquisitions (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2012
Feb. 07, 2012
POS and RDS
May 31, 2012
Wyse Sistemas De Informatica [Member]
Jun. 14, 2012
Retail Automation Products [Member]
Sep. 30, 2011
Radiant [Member]
Sep. 30, 2011
Radiant [Member]
Sep. 07, 2012
Transoft International [Member]
Business Acquisition [Line Items]              
Business Acquisition, Cost of Acquired Entity, Purchase Price   $ 1 $ 13 $ 10     $ 40
Business Combination, Acquisition Related Costs             7
Business Acquisition, Purchase Price Allocation, Goodwill Amount 46            
Business Acquisition, Purchase Price Allocation, Goodwill, Expected Tax Deductible Amount 16            
Business Acquisition, Pro Forma Information [Abstract]              
Revenue         1,463 4,057  
Net income attributable to NCR         $ 35 $ 78