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Business Combinations - Additional Information (Detail)
$ in Millions
 3 Months Ended 12 Months Ended
Dec. 02, 2019
USD ($)
Feb. 06, 2019
USD ($)
Dec. 31, 2020
USD ($)
Acquisition
Sep. 30, 2020
Acquisition
Jun. 30, 2020
Acquisition
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Business Acquisition [Line Items]                
Business acquisitions, deferred consideration     $ 20     $ 20    
Payment for business acquisitions, net of cash and cash equivalents acquired           113 $ 127  
Deferred and contingent consideration recognized     143     143    
Goodwill     $ 330     330 162 $ 121
2020 Acquisitions [Member]                
Business Acquisition [Line Items]                
Name of acquired entity     minor acquisition in the Microcontrollers and Digital ICs Group entire share capital of Ultra Wide Band specialist BeSpoon, of the cellular IoT connectivity assets of Riot Micro and of the radio-frequency assets of SOMOS French Gallium Nitride (GaN) innovator Exagan      
Number of Acquisitions | Acquisition     1 3 1      
Payment for business acquisitions, before cash acquired           104    
Cash acquired           1    
Business acquisitions, deferred consideration     $ 18     18    
Business acquisitions, contingent consideration     117     117    
Payment for business acquisitions, net of cash and cash equivalents acquired           103    
Deferred and contingent consideration recognized     143     143    
Fair value of business acquired     239     239    
Deferred tax assets     5     5    
Deferred tax liabilities     18     18    
Goodwill     $ 135     $ 135    
2020 Acquisitions [Member] | Discount Rate [Member] | Minimum [Member]                
Business Acquisition [Line Items]                
Discount rate     1.55     1.55    
2020 Acquisitions [Member] | Discount Rate [Member] | Maximum [Member]                
Business Acquisition [Line Items]                
Discount rate     4.07     4.07    
Norstel AB [Member]                
Business Acquisition [Line Items]                
Cash acquired             1  
Percentage of business acquired 45.00% 55.00%            
Fair value of business acquired     $ 138     $ 138 138  
Consideration paid $ 51 $ 77            
Deferred tax assets     4     4    
Deferred tax liabilities     18     18    
Increase in goodwill           14    
Goodwill     $ 57     $ 57 43  
Norstel AB [Member] | Restricted Cash Current [Member]                
Business Acquisition [Line Items]                
Escrow account             $ 10