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FAIR VALUE MEASUREMENTS - RECON OF LEVEL 3 ASSETS (Details) - USD ($)
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2018
Dec. 31, 2017
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]            
Balance at April 1 $ (40,000,000) $ (96,000,000) $ (28,000,000) $ (74,000,000) $ (28,000,000) $ (74,000,000)
Realized and unrealized gains (losses) 11,000,000 (3,000,000) 15,000,000 (16,000,000)    
Allocated transmission instruments     3,000,000 0    
Settlements (2,000,000) 9,000,000 (21,000,000) 0    
Balance at June 30 (31,000,000) (90,000,000) (31,000,000) (90,000,000)   (28,000,000)
Change in unrealized gains relating to instruments still held at the end of the period 3,000,000 2,000,000 (4,000,000) (14,000,000)    
Minimum [Member]            
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]            
Market electricity forward price inputs ( in dollars per MWH) 19.75 21.35 19.75 21.35    
Maximum [Member]            
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]            
Market electricity forward price inputs ( in dollars per MWH) $ 54.25 $ 46.35 $ 54.25 $ 46.35    
San Diego Gas and Electric Company [Member] | Minimum [Member]            
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]            
Congestion revenue rights (in dollars per MWH)           (11.88)
San Diego Gas and Electric Company [Member] | Maximum [Member]            
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]            
Congestion revenue rights (in dollars per MWH)           $ 6.93
San Diego Gas and Electric Company [Member] | Forecast [Member] | Minimum [Member]            
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]            
Congestion revenue rights (in dollars per MWH)         (7.25)  
San Diego Gas and Electric Company [Member] | Forecast [Member] | Maximum [Member]            
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]            
Congestion revenue rights (in dollars per MWH)         $ 11.99