v3.10.0.1
Significant Accounting Policies - Exchange Rates for U.S. Dollars into Euros Applicable for Translation of NXP's Financial Statements (Detail) - € / $
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Financial Statement Details [Line Items]      
Exchange rates for U.S. dollars into euros 1.1451 1.1932 1.0474
Average [Member]      
Financial Statement Details [Line Items]      
Exchange rates for U.S. dollars into euros [1] 1.1794 1.1310 1.1065
Maximum [Member]      
Financial Statement Details [Line Items]      
Exchange rates for U.S. dollars into euros 1.1352 1.0474 1.0474
Minimum [Member]      
Financial Statement Details [Line Items]      
Exchange rates for U.S. dollars into euros 1.2431 1.1932 1.1423
[1] The average of the noon-buying rate at the end of each fiscal month during the period presented.