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Acquisitions, Investments and Dispositions - Sempra Solar (Details)
$ / shares in Units, $ in Millions
11 Months Ended 12 Months Ended
Dec. 13, 2018
USD ($)
$ / shares
MW
Dec. 12, 2018
USD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2020
USD ($)
Business Acquisition [Line Items]          
Business acquisition, pre-tax gain from interests in projects $ 131     $ 131  
Long-term debt     $ 19,973   $ 22,349
Sempra Solar          
Business Acquisition [Line Items]          
Ownership percentage 50.00%        
Renewable Electric Production Projects | Sempra Solar          
Business Acquisition [Line Items]          
Project generating capacity (MW AC) | MW 379        
Sempra Solar          
Business Acquisition [Line Items]          
Business acquisition, pre-tax gain from interests in projects $ 131        
Business acquisition, after-tax gain from interests in projects $ 89        
Business acquisition, after-tax gain from interests in projects, per share (in dollars per share) | $ / shares $ 0.28        
Con Edison Development | Sempra Solar          
Business Acquisition [Line Items]          
Purchase price $ 1,609        
Working capital and other closing adjustments 69        
Reclassification adjustment to property, plant and equipment and asset retirement obligations     $ 100    
Period available to finalize purchase price allocation     1 year    
Acquisition-date fair value of ownership interest held 568 $ 437      
Property, plant and equipment acquired 1,354        
Intangible assets acquired 878        
Noncurrent assets $ 4        
Weighted average amortization period for intangible assets 16 years        
Fair value of noncontrolling interest attributable to tax equity investors $ 100        
Sempra Solar | Renewable Electric Production Projects          
Business Acquisition [Line Items]          
Project generating capacity (MW AC) | MW 981        
Long-term debt $ 568        
Asset retirement obligation $ 28