OTHER CONTINGENCIES AND COMMITMENTS (Environmental Remediation Contingencies Liability) (Details) - USD ($) $ in Millions	Jun. 30, 2021	Dec. 31, 2020
Site Contingency [Line Items]
Former manufactured gas plant sites owned by the Utility or third parties	$ 681	$ 659
Utility-owned generation facilities (other than fossil fuel-fired), other facilities, and third-party disposal sites	112	111
Fossil fuel-fired generation facilities and sites	75	96
Environmental Remediation Liability	1,292	1,301
Topock, Arizona
Site Contingency [Line Items]
Natural gas compressor station	295	303
Hinkley, California
Site Contingency [Line Items]
Natural gas compressor station	$ 129	$ 132