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Cover - USD ($)
$ in Billions
 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 0-19731    
Entity Registrant Name GILEAD SCIENCES, INC.    
Entity Central Index Key 0000882095    
Current Fiscal Year End Date --12-31    
Document Fiscal Year Focus 2019    
Document Fiscal Period Focus FY    
Amendment Flag false    
Entity Incorporation, State or Country Code DE    
Entity Tax Identification Number 94-3047598    
Entity Address, Address Line One 333 Lakeside Drive    
Entity Address, City or Town Foster City    
Entity Address, State or Province CA    
Entity Address, Postal Zip Code 94404    
City Area Code 650    
Local Phone Number 574-3000    
Title of 12(b) Security Common Stock, par value, $0.001 per share    
Trading Symbol GILD    
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     $ 66.4
Entity Common Stock, Shares Outstanding   1,263,636,656  
Documents Incorporated by Reference
Specified portions of the registrant’s proxy statement, which will be filed with the Commission pursuant to Regulation 14A in connection with the registrant’s 2020 Annual Meeting of Stockholders, to be held on May 6, 2020, are incorporated by reference into Part III of this Report.