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Cover Page
 12 Months Ended
Nov. 19, 2020
Dec. 31, 2020
Cover [Abstract]    
Document Type 8-K  
Document Period End Date Nov. 19, 2020  
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  
Current Fiscal Year End Date   --12-31
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  
Security Exchange Name NASDAQ  
Entity Emerging Growth Company false  
Entity Central Index Key 0001486159  
Amendment Flag false  
Title of 12(b) Security Common Stock  
Trading Symbol OAS