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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 ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2018
USD ($)
Business Acquisition [Line Items]        
Business acquisition, pre-tax gain from interests in projects $ 131   $ 131  
Long-term debt     $ 16,029 $ 18,145
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      
Acquisition-date fair value of ownership interest held 568 $ 437    
Property, plant and equipment acquired 1,454      
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 $ 128