OTHER CONTINGENCIES AND COMMITMENTS (Environmental Remediation Contingencies Liability) (Details) - USD ($) $ in Millions	Mar. 31, 2020	Dec. 31, 2019
Disclosure Commitments And Contingencies Environmental Remediation Liability Composed [Abstract]
Topock natural gas compressor station	$ 348	$ 362
Hinkley natural gas compressor station	133	138
Former manufactured gas plant sites owned by the Utility or third parties	667	568
Utility-owned generation facilities (other than fossil fuel-fired), other facilities, and third-party disposal sites	105	101
Fossil fuel-fired generation facilities and sites	104	106
Environmental Remediation Liability	$ 1,357	$ 1,275