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Subsequent Events (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Mar. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Feb. 23, 2021
Feb. 05, 2021
Dec. 29, 2020
Gener              
Subsequent Event [Line Items]              
Preferred Stock, Shares Subscribed but Unissued             1,980,000,000
Inversiones Cachagua SpA | Subsequent Event [Member]              
Subsequent Event [Line Items]              
Own-share Lending Arrangement, Shares, Issued           1,347,200,571  
Preferred Stock, Value, Issued           $ 205  
Guacolda Affiliate [Member]              
Subsequent Event [Line Items]              
Income (Loss) from Subsidiaries, before Tax   $ (54) $ (88) $ 11      
Guacolda Affiliate [Member] | Subsequent Event [Member]              
Subsequent Event [Line Items]              
Proceeds from the sale of equity method investments $ 34            
Guacolda Affiliate [Member] | Subsequent Event [Member] | AES Gener              
Subsequent Event [Line Items]              
Noncontrolling Interest, Ownership Percentage by Parent         50.00%    
AES Gener | AES Gener              
Subsequent Event [Line Items]              
Noncontrolling Interest, Ownership Percentage by Parent             67.00%
AES Gener | Subsequent Event [Member] | AES Gener              
Subsequent Event [Line Items]              
Noncontrolling Interest, Ownership Percentage by Parent           67.20%