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Acquisitions (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Business Acquisition [Line Items]    
Business Acquisition, Percentage of Voting Interests Acquired 75.00%  
Business Combination, Step Acquisition, Equity Interest in Acquiree, Remeasurement Gain $ 36 [1] $ 0
Equity Method Investment, Ownership Percentage 10.00%  
Business Combination, Step Acquisition, Equity Interest in Acquiree, Including Subsequent Acquisition, Percentage 25.00%  
Business Acquisition, Goodwill, Expected Tax Deductible Amount $ 81  
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%  
sPower [Member]    
Business Acquisition [Line Items]    
Business Combination, Consideration Transferred $ 77  
[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.