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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 12 Months Ended
Apr. 18, 2019
Sep. 30, 2019
Jul. 31, 2019
Mar. 31, 2021
Dec. 31, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Jul. 01, 2019
Mar. 31, 2019
Investments in and Advances to Affiliates [Line Items]                          
Gain (Loss) on Disposition of Business                 $ (95,000,000) $ 28,000,000 $ 984,000,000    
OPGC Affiliate [Member]                          
Investments in and Advances to Affiliates [Line Items]                          
Equity Method Investment, Ownership Percentage         49.00% 49.00%   49.00% 49.00% 49.00%      
Gain (Loss) on Disposition of Business         $ 23,000,000                
Equity Method Investment, Other than Temporary Impairment           $ 158,000,000 $ 43,000,000 $ 92,000,000 $ 201,000,000        
Equity Method Investment, Net Sales Proceeds         135,000,000                
Fluence [Member] | Subsequent Event [Member]                          
Investments in and Advances to Affiliates [Line Items]                          
Equity Method Investment, Ownership Percentage       44.00%                  
Fluence [Member] | Qatar Investment Authority                          
Investments in and Advances to Affiliates [Line Items]                          
Proceeds from Contributions from Affiliates         $ 125,000,000                
Guacolda Affiliate [Member]                          
Investments in and Advances to Affiliates [Line Items]                          
Equity Method Investment, Ownership Percentage         34.00%     33.00% 34.00% 33.00%      
Impaired Long-Lived Assets Held and Used, Facts and Circumstances Leading to Impairment                 $ 127,000,000 $ 158,000,000      
Equity Method Investment, Other than Temporary Impairment                   $ 92,000,000      
Unrealized Gain (Loss) on Investments                 $ 99,000,000        
Guacolda Affiliate [Member] | Subsequent Event [Member]                          
Investments in and Advances to Affiliates [Line Items]                          
Equity Method Investment, Net Sales Proceeds       $ 34,000,000                  
Gas Natural del Este [Member]                          
Investments in and Advances to Affiliates [Line Items]                          
Noncash or Part Noncash Divestiture, Amount of Consideration Received   $ 55,000,000                      
Gain (Loss) on Disposition of Property Plant Equipment   $ 2,000,000                      
Uplight                          
Investments in and Advances to Affiliates [Line Items]                          
Equity Method Investment, Ownership Percentage         32.00%     32.00% 32.00% 32.00%      
Business Combination, Consideration Transferred     $ 53,000,000                    
Equity Method Investments                       $ 98,000,000  
Equity Method Investment, Realized Gain (Loss) on Disposal     $ 12,000,000                    
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%
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                        
sPower [Member] | Long-term Debt                          
Investments in and Advances to Affiliates [Line Items]                          
Equity Method Investment, Net Sales Proceeds $ 58,000,000                        
Barry                          
Investments in and Advances to Affiliates [Line Items]                          
Equity Method Investment, Ownership Percentage [1]         100.00%     100.00% 100.00% 100.00%      
Other Long-term Debt         $ 46,000,000     $ 44,000,000 $ 46,000,000 $ 44,000,000      
Fair Value, Inputs, Level 3 [Member] | Long Lived Assets Held For Sale [Member] | OPGC Affiliate [Member]                          
Investments in and Advances to Affiliates [Line Items]                          
Assets Carrying Amount Disclosure Nonrecurring             $ 152,000,000 212,000,000   212,000,000      
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               $ 212,000,000   $ 212,000,000      
[1] Represents a VIE in which the Company holds a variable interest, but is not the primary beneficiary.