Postretirement Benefit Plans - Summary of PME Multi-Employer Plan (Detail) - PME Multi-Employer Plan [Member] $ in Millions |
12 Months Ended | ||
|---|---|---|---|
|
Dec. 31, 2018
USD ($)
Employee
|
Dec. 31, 2017
USD ($)
Employee
|
Dec. 31, 2016
USD ($)
Employee
|
|
| Multiemployer Plans [Line Items] | |||
| NXP’s contributions to the plan | $ 34 | $ 35 | $ 36 |
| (including employees’ contributions) | $ 4 | $ 4 | $ 4 |
| Average number of NXP’s active employees participating in the plan | Employee | 2,183 | 2,271 | 2,415 |