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Acquisitions (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2021
Mar. 31, 2021
Jun. 30, 2021
Jun. 30, 2020
Business Acquisition [Line Items]        
Business Combination, Step Acquisition, Equity Interest in Acquiree, Remeasurement Gain $ 176 $ 36 $ 212 [1] $ 0
Equity Method Investment, Ownership Percentage 10.00%   10.00%  
Business Acquisition, Goodwill, Expected Tax Deductible Amount $ 46 $ 81 $ 46  
Business Combination, Consideration Transferred, Including Equity Interest in Acquiree Held Prior to Combination     $ 7  
AIMco        
Business Acquisition [Line Items]        
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners 25.00%   25.00%  
Penonome Wind [Member]        
Business Acquisition [Line Items]        
Asset Acquisition, Purchase Price       $ 80
sPower [Member]        
Business Acquisition [Line Items]        
Business Combination, Consideration Transferred     $ 104  
Fluence [Member]        
Business Acquisition [Line Items]        
Equity Method Investment, Ownership Percentage 43.20% 50.00% 43.20%  
Cajuina Wind Cpmplex        
Business Acquisition [Line Items]        
Asset Acquisition, Purchase Price     $ 22  
Cubico Wind Complex        
Business Acquisition [Line Items]        
Asset Acquisition, Purchase Price     $ 109  
Series of Individually Immaterial Business Acquisitions        
Business Acquisition [Line Items]        
Business Acquisition, Percentage of Voting Interests Acquired 75.00%   75.00%  
Business Combination, Step Acquisition, Equity Interest in Acquiree, Including Subsequent Acquisition, Percentage 25.00%   25.00%  
[1] Related to the remeasurement of our existing equity interest in sPower’s development platform as part of the step acquisition to form AES Clean Energy Development. See Note 18—Acquisitions for further information.