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Investments In and Advances To Affiliates - Summary of Financial Information of Affiliates & Subsidiaries (Details) - USD ($)
1 Months Ended 3 Months Ended 9 Months Ended 12 Months Ended
Apr. 18, 2019
Apr. 09, 2018
Jan. 01, 2018
Sep. 30, 2019
Jul. 31, 2019
Dec. 31, 2019
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Sep. 30, 2019
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Jul. 01, 2019
Mar. 31, 2019
Investments in and Advances to Affiliates [Line Items]                                
Accumulated Other Comprehensive Income (Loss), Net of Tax     $ (1,857,000,000)     $ (2,229,000,000) $ (2,071,000,000)         $ (2,229,000,000) $ (2,071,000,000) $ (1,876,000,000)    
Investments in and advances to affiliates           966,000,000 1,114,000,000         966,000,000 1,114,000,000 1,197,000,000    
Gain (Loss) on Disposition of Business             $ 128,000,000 $ (21,000,000) $ 89,000,000 $ 788,000,000   28,000,000 984,000,000 (52,000,000)    
Gain (Loss) on Disposition of Property Plant Equipment       $ 2,000,000                        
Payments to Acquire Businesses and Interest in Affiliates                       192,000,000 66,000,000 609,000,000    
Proceeds from the sale of business interests, net of cash and restricted cash sold                       178,000,000 2,020,000,000 108,000,000    
Equity Method Investments                             $ 98,000,000  
Net equity in earnings (losses) of affiliates           $ (175,000,000)           $ (172,000,000) $ 39,000,000 71,000,000    
Guacolda Affiliate [Member]                                
Investments in and Advances to Affiliates [Line Items]                                
Equity Method Investment, Ownership Percentage [1]           33.00% 33.00%         33.00% 33.00%      
Investments in and advances to affiliates [1]           $ 74,000,000 $ 209,000,000         $ 74,000,000 $ 209,000,000      
Impaired Long-Lived Assets Held and Used, Facts and Circumstances Leading to Impairment                       $ 158,000,000        
Equity Method Investment, Other than Temporary Impairment                         $ 144,000,000      
Gas Natural del Este [Member]                                
Investments in and Advances to Affiliates [Line Items]                                
Equity Method Investment, Ownership Percentage [2]           43.00% 0.00%         43.00% 0.00%      
Investments in and advances to affiliates [2]           $ 48,000,000 $ 0         $ 48,000,000 $ 0      
Noncash or Part Noncash Divestiture, Amount of Consideration Received       $ 55,000,000                        
Distributed Energy [Member]                                
Investments in and Advances to Affiliates [Line Items]                                
Payments to Acquire Businesses, Net of Cash Acquired                         23,000,000      
Business Combination, Equity Interest in Acquiree, Remeasurement Gain (Loss)             $ (5,000,000)           $ 5,000,000      
Simple Energy [Member]                                
Investments in and Advances to Affiliates [Line Items]                                
Equity Method Investment, Ownership Percentage [2]           32.00% 63.00%         32.00% 63.00%      
Payments to Acquire Businesses, Net of Cash Acquired   $ 35,000,000                            
Investments in and advances to affiliates [2]           $ 91,000,000 $ 33,000,000         $ 91,000,000 $ 33,000,000      
Business Combination, Consideration Transferred         $ 53,000,000                      
Equity Method Investment, Realized Gain (Loss) on Disposal         $ 12,000,000                      
Fluence [Member]                                
Investments in and Advances to Affiliates [Line Items]                                
Business Acquisition, Percentage of Voting Interests Acquired     50.00%                          
Payments to Acquire Interest in Joint Venture     $ 7,000,000                          
Business Combination, Consideration Transferred     50,000,000                          
sPower [Member]                                
Investments in and Advances to Affiliates [Line Items]                                
Equity Method Investment, Ownership Percentage 26.00%         50.00% 50.00%         50.00% 50.00%     50.00%
Investments in and advances to affiliates           $ 442,000,000 $ 515,000,000         $ 442,000,000 $ 515,000,000      
Gain (Loss) on Disposition of Business $ 28,000,000                              
Equity Method Investment, Ownership Percentage Sold 48.00%                              
Equity Method Investment, Net Sales Proceeds $ 173,000,000                              
Reinvestment of Proceeds from Sale of Equity Method Investments                     $ 58,000,000 $ 58,000,000 $ 0 0    
Barry                                
Investments in and Advances to Affiliates [Line Items]                                
Equity Method Investment, Ownership Percentage [3]           100.00% 100.00%         100.00% 100.00%      
Other Long-term Debt           $ 44,000,000 $ 43,000,000         $ 44,000,000 $ 43,000,000      
Investments in and advances to affiliates [3]           $ 0 0         0 0      
Non-cash [Member] | Fluence [Member]                                
Investments in and Advances to Affiliates [Line Items]                                
Contribution of Property     $ 20,000,000                 $ 61,000,000 20,000,000 $ 0    
Fair Value, Inputs, Level 3 [Member] | Long Lived Assets Held For Sale [Member] | Guacolda Affiliate [Member]                                
Investments in and Advances to Affiliates [Line Items]                                
Assets Carrying Amount Disclosure Nonrecurring             $ 209,000,000           $ 209,000,000      
[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]
Simple Energy merged with Tendril on July 1, 2019 to form Uplight. Prior year information reported relates to Simple Energy.
[3]
Represents a VIE in which the Company holds a variable interest, but is not the primary beneficiary.