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Cover Page
 12 Months Ended
Dec. 15, 2020
Nov. 10, 2020
Dec. 31, 2020
Cover [Abstract]      
Document Type 8-K    
Document Period End Date Jan. 18, 2021    
Entity Registrant Name   OASIS PETROLEUM INC.  
Entity Incorporation, State or Country Code DE    
Entity File Number 001-34776    
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    
Written Communications false    
Soliciting Material false    
Pre-commencement Tender Offer false    
Pre-commencement Issuer Tender Offer false    
Title of 12(b) Security Common Stock    
Trading Symbol OAS    
Security Exchange Name NASDAQ    
Entity Emerging Growth Company false    
Entity Central Index Key 0001486159    
Amendment Flag false    
Current Fiscal Year End Date