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Cover Page - USD ($)
 12 Months Ended
Dec. 31, 2019
Jan. 24, 2020
Jun. 30, 2019
Cover page.      
Document Type 10-K    
Document Annual Report true    
Document Transition Report false    
Document Period End Date Dec. 31, 2019    
Document Fiscal Period Focus FY    
Document Fiscal Year Focus 2019    
Current Fiscal Year End --12-31    
Entity File Number 001-38147    
Amendment Flag false    
Entity Registrant Name CONSOL Energy Inc.    
Entity Incorporation, State or Country Code DE    
Entity Tax Identification Number 82-1954058    
Entity Address, Address Line One 1000 CONSOL Energy Drive    
Entity Address, Address Line Two Suite 100    
Entity Address, City or Town Canonsburg    
Entity Address, State or Province PA    
Entity Address, Postal Zip Code 15317-6506    
City Area Code 724    
Local Phone Number 416-8300    
Title of 12(b) Security Common Stock ($0.01 par value)    
Trading Symbol CEIX    
Security Exchange Name NYSE    
Entity Central Index Key 0001710366    
Entity Well-known Seasoned Issuer No    
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     $ 717,967,071
Entity Common Stock, Shares Outstanding   25,932,618  
Documents Incorporated by Reference
Portions of CONSOL Energy Inc.'s Proxy Statement for the Annual Meeting of Shareholders to be held on May 8, 2020 are incorporated by reference in Items 10, 11, 12, 13 and 14 of Part III.