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Investments In and Advances To Affiliates - Effective Equity Ownership Interest and Carrying Values (Details) - USD ($)
3 Months Ended 12 Months Ended
Apr. 09, 2018
Dec. 31, 2019
Dec. 31, 2018
Apr. 18, 2019
Mar. 31, 2019
Dec. 31, 2017
Investments in and Advances to Affiliates [Line Items]            
Investments in and advances to affiliates   $ 966,000,000 $ 1,114,000,000     $ 1,197,000,000
sPower [Member]            
Investments in and Advances to Affiliates [Line Items]            
Investments in and advances to affiliates   $ 442,000,000 $ 515,000,000      
Equity Method Investment, Ownership Percentage   50.00% 50.00% 26.00% 50.00%  
Gener Subsidiary [Member]            
Investments in and Advances to Affiliates [Line Items]            
Noncontrolling Interest, Ownership Percentage by Parent   67.00%        
Barry            
Investments in and Advances to Affiliates [Line Items]            
Investments in and advances to affiliates [1]   $ 0 $ 0      
Equity Method Investment, Ownership Percentage [1]   100.00% 100.00%      
Other Long-term Debt   $ 44,000,000 $ 43,000,000      
Simple Energy [Member]            
Investments in and Advances to Affiliates [Line Items]            
Investments in and advances to affiliates [2]   $ 91,000,000 $ 33,000,000      
Equity Method Investment, Ownership Percentage [2]   32.00% 63.00%      
Payments to Acquire Businesses, Net of Cash Acquired $ 35,000,000          
Eolica Mesa La Paz [Member]            
Investments in and Advances to Affiliates [Line Items]            
Investments in and advances to affiliates [3]   $ 66,000,000 $ 8,000,000      
Equity Method Investment, Ownership Percentage [3]   50.00% 50.00%      
Gas Natural del Este [Member]            
Investments in and Advances to Affiliates [Line Items]            
Investments in and advances to affiliates [2]   $ 48,000,000 $ 0      
Equity Method Investment, Ownership Percentage [2]   43.00% 0.00%      
Distributed Energy [Member]            
Investments in and Advances to Affiliates [Line Items]            
Payments to Acquire Businesses, Net of Cash Acquired     $ 23,000,000      
Guacolda Affiliate [Member]            
Investments in and Advances to Affiliates [Line Items]            
Investments in and advances to affiliates [4]   $ 74,000,000 $ 209,000,000      
Equity Method Investment, Ownership Percentage [4]   33.00% 33.00%      
Equity Method Investment, Other than Temporary Impairment     $ 144,000,000      
Guacolda Affiliate [Member] | Gener Subsidiary [Member]            
Investments in and Advances to Affiliates [Line Items]            
Equity Method Investment, Ownership Percentage   50.00%        
OPGC Affiliate [Member]            
Investments in and Advances to Affiliates [Line Items]            
Investments in and advances to affiliates   $ 212,000,000 $ 293,000,000      
Equity Method Investment, Ownership Percentage   49.00% 49.00%      
Equity Method Investment, Other than Temporary Impairment   $ 92,000,000        
Other Affiliates [Member]            
Investments in and Advances to Affiliates [Line Items]            
Investments in and advances to affiliates [5]   $ 33,000,000 $ 56,000,000      
[1]
Represents a VIE in which the Company holds a variable interest, but is not the primary beneficiary.
[2]
Simple Energy merged with Tendril on July 1, 2019 to form Uplight. Prior year information reported relates to Simple Energy.
[3]
The Eólica Mesa La Paz project received funding throughout 2019 and began operations during December 2019.
[4]
The Company's ownership in Guacolda is held through AES Gener, a 67%-owned consolidated subsidiary. AES Gener owns 50% of Guacolda, resulting in an AES effective ownership in Guacolda of 33%.
[5]
Includes Bosforo, Fluence, Distributed Energy equity method investments, and others.