OTHER CONTINGENCIES AND COMMITMENTS (Schedule Environmental Remediation Liability Composed) (Details) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Disclosure Commitments And Contingencies Environmental Remediation Liability Composed [Abstract]
Topock natural gas compressor station	$ 303	$ 362
Hinkley natural gas compressor station	132	138
Former manufactured gas plant sites owned by the Utility or third parties	659	568
Utility-owned generation facilities (other than fossil fuel-fired), other facilities, and third-party disposal sites	111	101
Fossil fuel-fired generation facilities and sites	96	106
Total environmental remediation liability	$ 1,301	$ 1,275