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Supplemental Financial Information Supplemental Financial Information - Other (Expense) Income (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Other (Expense) Income [Abstract]      
Interest and Other Income $ 6us-gaap_InterestAndOtherIncome $ 6us-gaap_InterestAndOtherIncome $ 6us-gaap_InterestAndOtherIncome
Foreign Currency Exchange Rate Changes And Gain Loss on Foreign Currency Contracts (32)ncr_ForeignCurrencyExchangeRateChangesAndGainLossonForeignCurrencyContracts (13)ncr_ForeignCurrencyExchangeRateChangesAndGainLossonForeignCurrencyContracts (2)ncr_ForeignCurrencyExchangeRateChangesAndGainLossonForeignCurrencyContracts
Other than Temporary Impairment Losses, Investments, Portion Recognized in Earnings, Net 3us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsPortionRecognizedInEarningsNet 0us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsPortionRecognizedInEarningsNet 7us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsPortionRecognizedInEarningsNet
Gain (Loss) on Investments 4us-gaap_GainLossOnInvestments 0us-gaap_GainLossOnInvestments 0us-gaap_GainLossOnInvestments
Other Nonoperating Expense 10us-gaap_OtherNonoperatingExpense 2us-gaap_OtherNonoperatingExpense 5us-gaap_OtherNonoperatingExpense
Other Nonoperating Income (Expense) $ (35)us-gaap_OtherNonoperatingIncomeExpense $ (9)us-gaap_OtherNonoperatingIncomeExpense $ (8)us-gaap_OtherNonoperatingIncomeExpense