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Investments In and Advances To Affiliates - Effective Equity Ownership Interest and Carrying Values (Details) - USD ($)
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Investments in and Advances to Affiliates [Line Items]      
Investments in and advances to affiliates $ 1,114,000,000 $ 1,197,000,000 $ 621,000,000
Equity Method Investment, Other than Temporary Impairment 144,000,000    
sPower [Member]      
Investments in and Advances to Affiliates [Line Items]      
Investments in and advances to affiliates $ 515,000,000 $ 508,000,000  
Equity Method Investment, Ownership Percentage 50.00% 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]      
Equity Method Investment, Ownership Percentage 100.00%    
Other Long-term Debt $ 43,000,000 $ 45,000,000  
Guacolda Affiliate [Member]      
Investments in and Advances to Affiliates [Line Items]      
Investments in and advances to affiliates [1] $ 209,000,000 $ 357,000,000  
Equity Method Investment, Ownership Percentage [1] 33.00% 33.00%  
OPGC      
Investments in and Advances to Affiliates [Line Items]      
Investments in and advances to affiliates [2] $ 293,000,000 $ 269,000,000  
Equity Method Investment, Ownership Percentage [2] 49.00% 49.00%  
Other Affiliates [Member]      
Investments in and Advances to Affiliates [Line Items]      
Investments in and advances to affiliates $ 97,000,000 $ 63,000,000  
Gener Subsidiary [Member] | Guacolda Affiliate [Member]      
Investments in and Advances to Affiliates [Line Items]      
Equity Method Investment, Ownership Percentage 50.00%    
[1] 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%.
[2] OPGC has one coal-fired project under development which is an expansion of our existing OPGC business. The project started construction in April 2014 and is expected to begin operations in 2019.