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ACQUISTION AND DIVESTITURE ACTIVITY - ACQUISITION ACTIVITY (Details)
$ in Millions
1 Months Ended 3 Months Ended 6 Months Ended
Jul. 13, 2018
shares
Jun. 29, 2018
USD ($)
kv
Mar. 09, 2018
USD ($)
Mar. 08, 2018
USD ($)
shares
Feb. 28, 2018
USD ($)
MW
Jan. 12, 2018
USD ($)
Jan. 09, 2018
shares
Jul. 10, 2017
USD ($)
ppa
MW
Jan. 31, 2018
USD ($)
Jun. 30, 2018
USD ($)
shares
Jun. 30, 2018
USD ($)
shares
Jun. 30, 2017
USD ($)
[1]
Business Acquisition [Line Items]                        
Cash paid, net of cash and cash equivalents acquired                     $ (9,566) $ 0
Repayments of debt           $ 800     $ 800      
Issuances of common stock, net of $38 in offering costs in 2018                     $ 2,090 $ 28
Oncor Electric Delivery Company LLC. [Member]                        
Business Acquisition [Line Items]                        
Acquired percentage interest     80.25%                  
Oncor Holdings [Member]                        
Business Acquisition [Line Items]                        
Consideration     $ 9,566                  
Fisterra Midstream Mexico [Member] | Sempra Mexico [Member]                        
Business Acquisition [Line Items]                        
Cash consideration         $ 5              
Commitment to Invest         $ 130              
Generating capacity | MW         125              
Term of power purchase agreement         15 years              
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%                  
Ownership percentage in consolidated entity     0.22%                  
Consideration     $ 26                  
Sempra Texas Holdings Corp [Member]                        
Business Acquisition [Line Items]                        
Proceeds from Issuance of Debt and Equity                 $ 7,000      
Proceeds from issuance of debt           $ 4,900            
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] | Texas Transmission Investment LLC [Member] | Oncor Electric Delivery Company LLC. [Member]                        
Business Acquisition [Line Items]                        
Ownership percentage held by noncontrolling owners     19.75%                  
Sempra Texas Holdings Corp [Member] | Oncor Holdings [Member]                        
Business Acquisition [Line Items]                        
Cash consideration     $ 9,450                  
Adjustment for dividends     31                  
Transaction costs incurred     $ 59                  
Sempra Texas Holdings Corp [Member] | Oncor Holdings [Member] | Oncor Electric Delivery Company LLC. [Member]                        
Business Acquisition [Line Items]                        
Ownership percentage in consolidated entity     80.25%                  
Great Valley Solar [Member] | Sempra Renewables [Member]                        
Business Acquisition [Line Items]                        
Cash consideration               $ 124        
Generating capacity | MW               200        
Number of PPAs | ppa               4        
Term of power purchase agreement               18 years        
Companía Transmisora del Norte Grande S.A. [Member] | Sempra South American Utilities [Member]                        
Business Acquisition [Line Items]                        
Acquired percentage interest   100.00%                    
Consideration   $ 220                    
Common Stock [Member]                        
Business Acquisition [Line Items]                        
Shares issued | shares       8,556,630     26,869,158     7,651,671 16,208,301  
Common Stock [Member] | Subsequent Event [Member]                        
Business Acquisition [Line Items]                        
Shares issued | shares 11,212,500                      
Common Stock [Member] | Settlement of Forward Sale Contracts [Member]                        
Business Acquisition [Line Items]                        
Issuances of common stock, net of $38 in offering costs in 2018       $ 900           $ 800 $ 1,700  
Underwriting discount       16                
Commercial Paper [Member] | Sempra Texas Holdings Corp [Member] | Oncor Holdings [Member]                        
Business Acquisition [Line Items]                        
Proceeds from issuance of debt       $ 2,600                
Weighted average maturity       47 days                
Weighted average interest rate       2.20%                
Single-circuit Transmission Line [Member] | Companía Transmisora del Norte Grande S.A. [Member] | Sempra South American Utilities [Member]                        
Business Acquisition [Line Items]                        
Energy Transmission Voltage | kv   110                    
Double-circuit Transmission Line [Member] | Companía Transmisora del Norte Grande S.A. [Member] | Sempra South American Utilities [Member]                        
Business Acquisition [Line Items]                        
Energy Transmission Voltage | kv   220                    
[1] As adjusted for the retrospective adoption of ASU 2016-18, which we discuss in Note 2.