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DERIVATIVE INSTRUMENTS WITH CONTINGENT FEATURES (Details) - USD ($)
$ in Millions
Jun. 30, 2016
Dec. 31, 2015
Derivative Instruments, Gain (Loss) [Line Items]    
Derivative, Net Liability Position, Aggregate Fair Value $ 6 $ 6
Additional Collateral Aggregate Fair Value 8  
San Diego Gas and Electric Company [Member]    
Derivative Instruments, Gain (Loss) [Line Items]    
Derivative, Net Liability Position, Aggregate Fair Value 2 $ 5
Additional Collateral Aggregate Fair Value $ 4