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Cover Page - USD ($)
$ in Billions
 12 Months Ended
Dec. 31, 2019
Feb. 20, 2020
Jun. 30, 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 001-35935    
Entity Registrant Name PORTOLA PHARMACEUTICALS, INC.    
Entity Incorporation, State or Country Code DE    
Entity Tax Identification Number 20-0216859    
Entity Address, Address Line One 270 E. Grand Avenue    
Entity Address, City or Town South San Francisco    
Entity Address, State or Province CA    
Entity Address, Postal Zip Code 94080    
City Area Code 650    
Local Phone Number 246-7000    
Title of 12(b) Security Common Stock, par value $0.001 per share    
Trading Symbol PTLA    
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     $ 1.1
Entity Common Stock, Shares Outstanding   78,080,365  
Documents Incorporated by Reference
Part III incorporates information by reference to the definitive proxy statement for the registrant’s 2019 Annual Meeting of Stockholders to be filed within 120 days of the registrant’s fiscal year ended December 31, 2019.
    
Amendment Flag false    
Document Fiscal Year Focus 2019    
Document Fiscal Period Focus FY    
Entity Central Index Key 0001269021    
Current Fiscal Year End Date --12-31