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Investments In and Advances To Affiliates (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended 9 Months Ended
Sep. 30, 2021
Mar. 31, 2021
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Jun. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Nov. 01, 2021
Jun. 30, 2021
Investments in and Advances to Affiliates [Line Items]                    
Revenue $ 3,036   $ 2,545       $ 8,371 $ 7,100    
Operating margin (loss) 760   756       2,152 1,787    
Gain (Loss) on Disposition of Business $ 22   (90)       $ 81 (117)    
Equity Method Investment, Ownership Percentage 10.00%           10.00%      
Income (Loss) from Equity Method Investments $ 25   $ (112)       $ (15) (106)    
Contributions and loans to equity affiliates             321 286    
Qatar Investment Authority                    
Investments in and Advances to Affiliates [Line Items]                    
Equity Method Investment, Ownership Percentage Sold                   13.60%
Qatar Investment Authority                    
Investments in and Advances to Affiliates [Line Items]                    
Equity Method Investment, Purchase Price Agreement             125      
Majority Owned Affiliate [Member]                    
Investments in and Advances to Affiliates [Line Items]                    
Revenue             1 1    
Operating margin (loss)             0 (2)    
Net Income (Loss), Including Portion Attributable to Nonredeemable Noncontrolling Interest             (4) (3)    
Minority Owned Affiliates [Member]                    
Investments in and Advances to Affiliates [Line Items]                    
Revenue             866 1,404    
Operating margin (loss)             45 203    
Net Income (Loss), Including Portion Attributable to Nonredeemable Noncontrolling Interest             (108) $ (444)    
OPGC [Member]                    
Investments in and Advances to Affiliates [Line Items]                    
Equity Method Investments, Fair Value Disclosure         $ 152          
Equity Method Investment OTTI       $ 158 $ 43 $ 201        
Equity Method Investment, Ownership Percentage     49.00%         49.00%    
sPower [Member]                    
Investments in and Advances to Affiliates [Line Items]                    
Business Combination, Consideration Transferred             $ 102      
Fluence [Member]                    
Investments in and Advances to Affiliates [Line Items]                    
Equity Method Investment, Ownership Percentage 43.20%           43.20%     50.00%
Equity Method Investment, Realized Gain (Loss) on Disposal (less than)             $ 60      
Guacolda [Member]                    
Investments in and Advances to Affiliates [Line Items]                    
Equity Method Investment, Purchase Price Agreement   $ 34                
Equity Method Investment, Ownership Percentage                   50.00%
Equity Method Investment, Realized Gain (Loss) on Disposal (less than) $ 34                  
Equity Method Investment Long Lived Asset Impairment     $ 127              
Uplight [Member]                    
Investments in and Advances to Affiliates [Line Items]                    
Equity Method Investment, Ownership Percentage 30.60%           30.60%     32.30%
Business Combination, Consideration Transferred, Equity Interests Issued and Issuable             $ 37      
Business Combination, Step Acquisition, Equity Interest in Acquiree, Remeasurement Loss             $ 11      
Grupo Energía Gas Panamá                    
Investments in and Advances to Affiliates [Line Items]                    
Equity Method Investment, Ownership Percentage 49.00%           49.00%      
Payments to Acquire Equity Method Investments             $ 21      
Subsequent Event [Member] | Fluence [Member]                    
Investments in and Advances to Affiliates [Line Items]                    
Equity Method Investment, Ownership Percentage                 34.20%