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Subsequent Events (Notes)	12 Months Ended
Subsequent Events (Notes)	Dec. 31, 2017
Subsequent Events [Abstract]
Subsequent Events [Text Block]	18. SUBSEQUENT EVENTS On February 8, 2018, NCR announced that, to accelerate its transformation journey, it would evaluate programs to prioritize driving sustainable margin improvement, higher productivity and process efficiencies focusing on investing in software products that accelerate growth, driving growth in services through structural improvements and optimizing its hardware production, sourcing and supply chain strategy.