v2.4.0.6

Postretirement Benefit Plans - Summary of Actual Pension Plan Asset Allocation (Detail) | 12 Months Ended
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Dec. 31, 2012 | Dec. 31, 2011
Plan Asset Allocation [Line Items] |  |
Actual benefit plan asset allocation | 100.00% | 100.00%
Equity securities [Member] |  |
Plan Asset Allocation [Line Items] |  |
Actual benefit plan asset allocation | 26.00% | 21.00%
Debt securities [Member] |  |
Plan Asset Allocation [Line Items] |  |
Actual benefit plan asset allocation | 58.00% | 64.00%
Insurance contracts [Member] |  |
Plan Asset Allocation [Line Items] |  |
Actual benefit plan asset allocation | 3.00% | 4.00%
Other [Member] |  |
Plan Asset Allocation [Line Items] |  |
Actual benefit plan asset allocation | 13.00% | 11.00%

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- Definition Defined Benefit Plan Actual Plan Asset Allocation + References No definition available. + Details
Name: | nxpi_DefinedBenefitPlanActualPlanAssetAllocation
Namespace Prefix: | nxpi_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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