OTHER CONTINGENCIES AND COMMITMENTS (Schedule Environmental Remediation Liability Composed) (Details) - USD ($) $ in Millions	Dec. 31, 2018	Dec. 31, 2017
Disclosure Commitments And Contingencies Environmental Remediation Liability Composed [Abstract]
Topock natural gas compressor station	$ 369	$ 334
Hinkley natural gas compressor station	146	147
Former manufactured gas plant sites owned by the Utility or third parties	520	320
Utility-owned generation facilities (other than fossil fuel-fired), other facilities, and third-party disposal sites	111	115
Fossil fuel-fired generation facilities and sites	137	123
Total environmental remediation liability	$ 1,283	$ 1,039