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Business Combination (Details) (USD $)
In Millions, except Per Share data
3 Months Ended9 Months Ended
Sep. 30, 2011
Sep. 30, 2010
Sep. 30, 2011
Sep. 30, 2010
Aug. 24, 2011
Hospitality and Special Retail [Member]
Radiant [Member]
Aug. 24, 2011
Financial Services [Member]
Radiant [Member]
Aug. 24, 2011
Retail Solutions [Member]
Radiant [Member]
Aug. 24, 2011
Radiant [Member]
Jul. 11, 2011
Radiant [Member]
Business Acquisition [Line Items]         
Business Acquisition, Cost of Acquired Entity, Purchase Price Per Share        $ 28
Business Combination, Acquisition Related Costs$ 24 $ 25      
Business Acquisition, Cost of Acquired Entity, Purchase Price       1,206 
Business Acquisition, Purchase Price Allocation, Goodwill, Expected Tax Deductible Amount       73 
Business Acquisition, Purchase Price Allocation, Net Tangible Assets       84 
Business Acquisition, Purchase Price Allocation, Goodwill Amount    6188699803 
Business Acquisition, Purchase Price Allocation, Amortizable Intangible Assets       319 
Business Acquisition, Pro Forma Information [Abstract]         
Revenue1,4631,2964,0573,668     
Net Income attributable to NCR$ 35$ 83$ 78$ 84