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Cover - USD ($)
12 Months Ended
Dec. 31, 2021
Jan. 31, 2022
Jun. 30, 2021
Class of Stock      
Document Type 10-K    
Document Annual Report true    
Document Period End Date Dec. 31, 2021    
Current Fiscal Year End Date --12-31    
Document Transition Report false    
Entity File Number 001-36002    
Entity Registrant Name Clearway Energy, Inc.    
Entity Incorporation, State or Country Code DE    
Entity Tax Identification Number 46-1777204    
Entity Address, Address Line One 300 Carnegie Center, Suite 300    
Entity Address, City or Town Princeton    
Entity Address, State or Province NJ    
Entity Address, Postal Zip Code 08540    
City Area Code 609    
Local Phone Number 608-1525    
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    
Entity Shell Company false    
ICFR Auditor Attestation Flag true    
Entity Public Float     $ 3,029,269,190
Documents Incorporated by Reference
Documents Incorporated by Reference:
Portions of the Registrant's Definitive Proxy Statement relating to its 2022 Annual Meeting of Stockholders
are incorporated by reference into Part III of this Annual Report on Form 10-K
   
Entity Central Index Key 0001567683    
Amendment Flag false    
Document Fiscal Year Focus 2021    
Document Fiscal Period Focus FY    
Common Class A      
Class of Stock      
Title of 12(b) Security Class A Common Stock, par value $0.01    
Trading Symbol CWEN.A    
Security Exchange Name NYSE    
Entity Common Stock, Shares Outstanding   34,599,645  
Common Class B      
Class of Stock      
Entity Common Stock, Shares Outstanding   42,738,750  
Common Class C      
Class of Stock      
Title of 12(b) Security Class C Common Stock, par value $0.01    
Trading Symbol CWEN    
Security Exchange Name NYSE    
Entity Common Stock, Shares Outstanding   81,869,907  
Common Class D      
Class of Stock      
Entity Common Stock, Shares Outstanding   42,738,750