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Investments Accounted for by the Equity Method and Variable Interest Entities - Consolidated Entities (Details) - USD ($)
$ in Millions
Sep. 30, 2020
May 29, 2020
Dec. 31, 2019
Schedule of Equity Method Investments [Line Items]      
Other current and non-current assets $ 2,787   $ 3,029
Property, plant and equipment 6,165   6,063
Intangible assets 1,371   1,428
Total Assets 9,725   9,700
Total Liabilities 7,488   $ 7,437
Oahu Solar Partnership      
Schedule of Equity Method Investments [Line Items]      
Other current and non-current assets 25    
Property, plant and equipment 182    
Intangible assets 0    
Total Assets 207    
Total Liabilities 125    
Noncontrolling interest 25    
Net assets less noncontrolling interests 57    
Kawailoa Partnership      
Schedule of Equity Method Investments [Line Items]      
Other current and non-current assets 24    
Property, plant and equipment 142    
Intangible assets 0    
Total Assets 166    
Total Liabilities 116    
Noncontrolling interest 35    
Net assets less noncontrolling interests 15    
Elbow Creek TE Holdco      
Schedule of Equity Method Investments [Line Items]      
Other current and non-current assets 10    
Property, plant and equipment 102    
Intangible assets 1    
Total Assets 113    
Total Liabilities 27    
Noncontrolling interest 74    
Net assets less noncontrolling interests 12    
Wildorado TE Holdco      
Schedule of Equity Method Investments [Line Items]      
Other current and non-current assets 16    
Property, plant and equipment 244    
Intangible assets 0    
Total Assets 260    
Total Liabilities 12    
Noncontrolling interest 107    
Net assets less noncontrolling interests 141    
DGPV Holdco 3      
Schedule of Equity Method Investments [Line Items]      
Other current and non-current assets 61    
Property, plant and equipment 329 $ 331  
Intangible assets 1 1  
Total Assets 391 401  
Total Liabilities 276 290  
Noncontrolling interest 3 6  
Net assets less noncontrolling interests 112 $ 105  
Alta TE Holdco      
Schedule of Equity Method Investments [Line Items]      
Other current and non-current assets 58    
Property, plant and equipment 363    
Intangible assets 228    
Total Assets 649    
Total Liabilities 44    
Noncontrolling interest 38    
Net assets less noncontrolling interests 567    
Spring Canyon      
Schedule of Equity Method Investments [Line Items]      
Other current and non-current assets 3    
Property, plant and equipment 82    
Intangible assets 0    
Total Assets 85    
Total Liabilities 5    
Noncontrolling interest 29    
Net assets less noncontrolling interests 51    
Buckthorn Renewables LLC      
Schedule of Equity Method Investments [Line Items]      
Other current and non-current assets 3    
Property, plant and equipment 209    
Intangible assets 0    
Total Assets 212    
Total Liabilities 7    
Noncontrolling interest 62    
Net assets less noncontrolling interests 143    
Other      
Schedule of Equity Method Investments [Line Items]      
Other current and non-current assets 5    
Property, plant and equipment 8    
Intangible assets 0    
Total Assets 13    
Total Liabilities 3    
Noncontrolling interest 0    
Net assets less noncontrolling interests $ 10