OTHER CONTINGENCIES AND COMMITMENTS (Schedule of Environmental Remediation Liability Composed) (Details) - USD ($) $ in Millions	Mar. 31, 2019	Dec. 31, 2018
Disclosure Commitments And Contingencies Environmental Remediation Liability Composed [Abstract]
Topock natural gas compressor station	$ 358	$ 369
Hinkley natural gas compressor station	145	146
Former manufactured gas plant sites owned by the Utility or third parties	525	520
Utility-owned generation facilities (other than fossil fuel-fired), other facilities, and third-party disposal sites	107	111
Fossil fuel-fired generation facilities and sites	131	137
Total environmental remediation liability	$ 1,266	$ 1,283