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Business Combinations and Investments (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Apr. 21, 2009
Mar. 18, 2010
Vivotech Inc [Member]
Aug. 05, 2010
Document Capture Technologies Inc. [Member]
Aug. 20, 2010
Mod Systems Inc [Member]
Aug. 24, 2011
Radiant [Member]
Dec. 31, 2011
Radiant [Member]
Hospitality and Special Retail [Member]
Dec. 31, 2011
Radiant [Member]
Financial Services [Member]
Dec. 31, 2011
Radiant [Member]
Retail Solutions [Member]
Business Acquisition [Line Items]                      
Business Acquisition, Cost Method Investment, Percent Minority Interest, Additional Investment         1.00%            
Business Acquisition, Cost Method Investment, Percent Minority Interest         6.00%   3.00%        
Equity Method Investment, Ownership Percentage           17.00% 5.00%        
Investment, Percent Minority Interest, Additional Investment             8.00%        
Investment, Percent Minority Investment Owned             16.00%        
Business Acquisition, Percentage of Additional Voting Interests Acquired       80.40%              
Purchase Consideration               $ 1,206      
Net Tangible Assets Acquired/(Liabilities Assumed)               78      
Purchased Intangible Assets               319      
Goodwill   14 15         809 624 86 99
Business Acquisition, Purchase Price Allocation, Goodwill, Expected Tax Deductible Amount   0 11         73      
Business Combination, Acquisition Related Costs 30                    
Business Acquisition, Pro Forma Information [Abstract]                      
Revenue 5,538 5,057                  
Net Income attributable to NCR $ 64 $ 102