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ACQUISTION AND DIVESTITURE ACTIVITY - Sempra Energy (Details) - USD ($)
$ / shares in Units, $ in Millions
Oct. 18, 2018
Dec. 18, 2018
Sharyland Holdings, LP [Member]    
Business Acquisition [Line Items]    
Commitment to invest $ 1,025  
Sempra Texas Utility [Member] | InfraREIT Acquisition [Member]    
Business Acquisition [Line Items]    
Consideration transferred $ 1,275  
Share price (USD per share) $ 21  
Management agreement termination fee $ 40  
Debt assumed $ 945  
Sempra Texas Utility [Member] | Sharyland Holdings, LP [Member]    
Business Acquisition [Line Items]    
Acquired percentage interest 50.00%  
Consideration transferred $ 98  
Sempra Texas Utility [Member] | InfraREIT [Member] | InfraREIT Acquisition [Member]    
Business Acquisition [Line Items]    
Acquired percentage interest 100.00%  
Sempra Texas Utility [Member] | InfraREIT Partners [Member] | InfraREIT Acquisition [Member]    
Business Acquisition [Line Items]    
Acquired percentage interest 100.00%  
Sempra Texas Utility [Member] | Sharyland Utilities [Member] | Sharyland Holdings, LP [Member]    
Business Acquisition [Line Items]    
Acquired percentage interest 100.00%  
Ownership percentage in consolidated entity 50.00%  
Disposal Group Held-for-sale [Member] | Solar Assets and One Wind Generation Facility [Member] | Sempra Renewables [Member]    
Business Acquisition [Line Items]    
Proceeds from sale   $ 1,600