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DERIVATIVE FINANCIAL INSTRUMENTS - CASH FLOW HEDGES NARRATIVE (Details)
$ in Millions
6 Months Ended
Jun. 30, 2021
USD ($)
Derivative [Line Items]  
Cash flow hedge gain (loss) to be reclassified $ (82)
Term of interest rate cash flow hedge 13 years
Southern California Gas Company [Member]  
Derivative [Line Items]  
Cash flow hedge gain (loss) to be reclassified $ (1)
Equity Method Investee [Member]  
Derivative [Line Items]  
Term of interest rate cash flow hedge 18 years