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ACQUISITIONS, DIVESTITURES AND DISCONTINUED OPERATIONS - ACQUISITION ACTIVITY (Details) - USD ($)
$ / shares in Units, $ in Millions
May 17, 2019
May 16, 2019
Dec. 18, 2018
Mar. 09, 2018
Oncor Holdings [Member]        
Business Acquisition [Line Items]        
Capital contributions   $ 1,330    
Oncor Electric Delivery Company LLC. [Member]        
Business Acquisition [Line Items]        
Acquired percentage interest       80.25%
Compania Transmisora del Norte Grande S.A. [Member]        
Business Acquisition [Line Items]        
Cash consideration     $ 208  
Consideration     226  
Cash acquired     $ 18  
Sempra Texas Holdings Corp [Member] | Oncor Electric Delivery Company LLC. [Member]        
Business Acquisition [Line Items]        
Acquired percentage interest       80.03%
Sempra Texas Holdings Corp [Member] | Sempra Texas Intermediate Holding Company LLC [Member] | Oncor Holdings [Member]        
Business Acquisition [Line Items]        
Ownership percentage in consolidated entity       100.00%
Sempra Texas Holdings Corp [Member] | Oncor Holdings [Member]        
Business Acquisition [Line Items]        
Cash consideration       $ 9,450
Adjustment for dividends       $ 31
Sempra Texas Holdings Corp [Member] | Texas Transmission Investment LLC [Member] | Oncor Electric Delivery Company LLC. [Member]        
Business Acquisition [Line Items]        
Ownership percentage held by noncontrolling owners       19.75%
Oncor Electric Delivery Company LLC Additional Acquisition [Member] | Sempra Texas Intermediate Holding Company LLC [Member] | Oncor Holdings [Member]        
Business Acquisition [Line Items]        
Cash consideration       $ 26
Oncor Electric Delivery Company LLC Additional Acquisition [Member] | Oncor Electric Delivery Company LLC. [Member] | Oncor Holdings [Member]        
Business Acquisition [Line Items]        
Acquired percentage interest       0.22%
InfraREIT Acquisition [Member] | Oncor Holdings [Member]        
Business Acquisition [Line Items]        
Acquired percentage interest   100.00%    
Consideration   $ 1,275    
Acquisition price per share acquired   $ 21    
Management agreement termination fee paid   $ 40    
Debt assumed $ 953      
Repayments of assumed debt 602      
Repayments of secured debt $ 351      
InfraREIT Partners [Member] | Oncor Holdings [Member]        
Business Acquisition [Line Items]        
Acquired percentage interest   100.00%    
Sharyland Holdings, LP [Member]        
Business Acquisition [Line Items]        
Acquired percentage interest   50.00%    
Consideration   $ 102    
Sharyland Holdings, LP [Member] | Sharyland Holdings, LP [Member] | Sharyland Utilities [Member]        
Business Acquisition [Line Items]        
Acquired percentage interest   100.00%    
Compania Transmisora del Norte Grande S.A. [Member] | Sempra South American Utilities [Member] | Compania Transmisora del Norte Grande S.A. [Member]        
Business Acquisition [Line Items]        
Acquired percentage interest     100.00%