v2.4.0.6

Significant Accounting Policies - Additional Information (Detail) | 12 Months Ended
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Dec. 31, 2012
Significant Accounting Policies [Line Items] |
Attributable to hedged risk, range minimum | 80.00%
Attributable to hedged risk, range maximum | 125.00%
Percentage of income tax benefit recognized | 50.00%
Percentage of fair value of plan assets | 10.00%

X
- Definition Defined Benefit Plan Fair Value Of Plan Assets Percentage + References No definition available. + Details
Name: | nxpi_DefinedBenefitPlanFairValueOfPlanAssetsPercentage
Namespace Prefix: | nxpi_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Income Tax Expense Benefit Percentage + References No definition available. + Details
Name: | nxpi_IncomeTaxExpenseBenefitPercentage
Namespace Prefix: | nxpi_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | nxpi_SignificantAccountingPoliciesLineItems
Namespace Prefix: | nxpi_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The upper end of the range of quotients represented as a percentage derived by dividing the change in value of a hedging instrument by the change in the value of the hedged item over the assessment period. + References No definition available. + Details
Name: | us-gaap_GeneralFairValueHedgeInformationDollarOffsetThresholdMaximum
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition The lower end of the range of quotients represented as a percentage derived by dividing the change in value of a hedging instrument by the change in the value of the hedged item over the assessment period. + References No definition available. + Details
Name: | us-gaap_GeneralFairValueHedgeInformationDollarOffsetThresholdMinimum
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant