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Cover Page - USD ($)
 12 Months Ended
Dec. 31, 2019
Feb. 19, 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 1-34776    
Entity Registrant Name Oasis Petroleum Inc.    
Entity Incorporation, State or Country Code DE    
Entity Tax Identification Number 80-0554627    
Entity Address, Address Line One 1001 Fannin Street    
Entity Address, Address Line Two Suite 1500    
Entity Address, City or Town Houston    
Entity Address, State or Province TX    
Entity Address, Postal Zip Code 77002    
City Area Code 281    
Local Phone Number 404-9500    
Title of 12(b) Security Common Stock    
Trading Symbol OAS    
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     $ 1,791,664,921
Entity Common Stock, Shares Outstanding   323,926,171  
Documents Incorporated by Reference Portions of the registrant’s definitive proxy statement for its 2020 Annual Meeting of Stockholders, which will be filed with the Securities and Exchange Commission within 120 days of December 31, 2019, are incorporated by reference into Part III of this report for the year ended December 31, 2019.    
Entity Central Index Key 0001486159    
Current Fiscal Year End Date --12-31    
Document Fiscal Period Focus FY    
Document Fiscal Year Focus 2019    
Amendment Flag false