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Cover Page - shares
 9 Months Ended
Sep. 30, 2019
Oct. 31, 2019
Cover page.    
Document Type 10-Q  
Document Quarterly Report true  
Document Period End Date Sep. 30, 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, 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 NYSE  
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 Common Stock, Shares Outstanding   321,311,099
Document Fiscal Year Focus 2019  
Amendment Flag false  
Document Fiscal Period Focus Q3  
Entity Central Index Key 0001486159  
Current Fiscal Year End Date --12-31