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Significant Accounting Policies - Exchange Rates for Euros into U.S. Dollars Applicable for Translation of NXP's Financial Statements (Detail)
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Dec. 31, 2012
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Dec. 31, 2011
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Dec. 31, 2010
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Period End [Member]
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| Financial Statement Details [Line Items] | ||||||||
| Exchange rates for euros into U.S. dollars | 1.3190 | 1.2938 | 1.3370 | |||||
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Average [Member]
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| Financial Statement Details [Line Items] | ||||||||
| Exchange rates for euros into U.S. dollars | 1.2887 | [1] | 1.3908 | [1] | 1.3326 | [1] | ||
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High [Member]
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| Financial Statement Details [Line Items] | ||||||||
| Exchange rates for euros into U.S. dollars | 1.2238 | 1.2938 | 1.2183 | |||||
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Low [Member]
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| Financial Statement Details [Line Items] | ||||||||
| Exchange rates for euros into U.S. dollars | 1.3347 | 1.4531 | 1.4402 | |||||
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