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Cover - USD ($)
$ in Billions
 12 Months Ended
Dec. 31, 2020
Feb. 12, 2021
Jun. 30, 2020
Cover [Abstract]      
Document Type 10-K    
Document Annual Report true    
Document Period End Date Dec. 31, 2020    
Current Fiscal Year End Date --12-31    
Document Transition Report false    
Entity File Number 1-06732    
Entity Registrant Name COVANTA HOLDING CORPORATION    
Entity Incorporation, State or Country Code DE    
Entity Tax Identification Number 95-6021257    
Entity Address, Street Address 445 South Street    
Entity Address, City Morristown    
Entity Address, State NJ    
Entity Address, Postal Zip Code 07960    
City Area Code 862    
Local Phone Number 345-5000    
Title of each class Class A common stock    
Trading Symbol(s) CVA    
Name of each exchange on which registered NYSE    
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    
ICFR Auditor Attestation Flag true    
Entity Shell Company false    
Entity Public Float     $ 1.1
Entity Common Stock, Shares Outstanding   131,981,775  
Documents Incorporated by Reference
Part of Form 10-K of Covanta Holding Corporation Documents Incorporated by Reference
Part III Portions of the Proxy Statement to be filed with the Securities and Exchange Commission in connection with the 2021 Annual Meeting of Stockholders.
    
Amendment Flag false    
Document Fiscal Year Focus 2020    
Document Fiscal Period Focus FY    
Entity Central Index Key 0000225648