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Cover Page - USD ($)
 12 Months Ended
Dec. 31, 2019
Feb. 18, 2020
Jun. 28, 2019
Cover page.      
Document Type 10-K    
Document Annual Report true    
Document Period End Date Dec. 31, 2019    
Document Transition Report false    
Entity File Number 1-33579    
Entity Registrant Name INTERDIGITAL, INC.    
Entity Incorporation, State or Country Code PA    
Entity Tax Identification Number 82-4936666    
Entity Address, Address Line One 200 Bellevue Parkway    
Entity Address, Address Line Two Suite 300    
Entity Address, City or Town Wilmington    
Entity Address, State or Province DE    
Entity Address, Postal Zip Code 19809-3727    
City Area Code 302    
Local Phone Number 281-3600    
Title of 12(b) Security Common Stock (par value $0.01 per share)    
Trading Symbol  IDCC    
Security Exchange Name NASDAQ    
Entity Well-known Seasoned Issuer Yes    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Interactive Data Current Yes    
Entity Filer Category Large Accelerated Filer    
Entity Small Business false    
Entity Emerging Growth Company false    
Entity Shell Company false    
Entity Public Float     $ 1,989,033,542
Entity Common Stock, Shares Outstanding   30,722,894  
Documents Incorporated by Reference
Portions of the registrant's definitive proxy statement to be filed pursuant to Regulation 14A in connection with the registrant's 2020 annual meeting of shareholders are incorporated by reference into Items 10, 11, 12, 13 and 14 of Part III of this Form 10-K.
    
Entity Central Index Key 0001405495    
Current Fiscal Year End Date --12-31    
Document Fiscal Year Focus 2019    
Document Fiscal Period Focus FY    
Amendment Flag false