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Basis of Presentation and Summary of Significant Accounting Policies Related Party Transactions (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Dec. 31, 2014
Banco Bradesco SA [Member]      
Related Party Transaction [Line Items]      
Revenue from Related Parties $ 18us-gaap_RevenueFromRelatedParties
/ us-gaap_RelatedPartyTransactionAxis
= ncr_BancoBradescoSaMember
$ 18us-gaap_RevenueFromRelatedParties
/ us-gaap_RelatedPartyTransactionAxis
= ncr_BancoBradescoSaMember
 
Banco Bradesco SA [Member]      
Related Party Transaction [Line Items]      
Due from Related Parties $ 10us-gaap_DueFromRelatedParties
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= ncr_BancoBradescoSaMember
  $ 15us-gaap_DueFromRelatedParties
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= ncr_BancoBradescoSaMember