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Acquisitions (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Dec. 31, 2021
Jun. 30, 2021
Business Acquisition [Line Items]        
Business Combination, Step Acquisition, Equity Interest in Acquiree, Remeasurement Gain     $ 36  
Equity Method Investment, Ownership Percentage 10.00%      
Business Acquisition, Goodwill, Expected Tax Deductible Amount   $ 81   $ 45
Business Combination, Consideration Transferred, Including Equity Interest in Acquiree Held Prior to Combination   7    
Other Income [Member]        
Business Acquisition [Line Items]        
Business Combination, Step Acquisition, Equity Interest in Acquiree, Remeasurement Gain $ 0 [1] $ 36    
AIMco        
Business Acquisition [Line Items]        
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners   25.00%    
sPower [Member]        
Business Acquisition [Line Items]        
Business Combination, Consideration Transferred   $ 77    
Great Cove Solar I        
Business Acquisition [Line Items]        
Asset Acquisition, Purchase Price   13    
Asset Acquisition, Contingent Consideration, Liability   $ 6    
Series of Individually Immaterial Business Acquisitions        
Business Acquisition [Line Items]        
Business Acquisition, Percentage of Voting Interests Acquired   75.00%    
Business Combination, Step Acquisition, Equity Interest in Acquiree, Including Subsequent Acquisition, Percentage   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 17—Acquisitions for further information.