WILDFIRE-RELATED CONTINGENCIES (Summary of Estimated Liabilities) (Details) - USD ($) $ in Millions	Mar. 31, 2019	Dec. 31, 2018
Loss Contingencies [Line Items]
Total wildfire-related claims	$ 0	$ 14,226
Pacific Gas & Electric Co
Loss Contingencies [Line Items]
Total wildfire-related claims	14,212	14,226
Pacific Gas & Electric Co \| 2015 Butte fire
Loss Contingencies [Line Items]
Total wildfire-related claims	212	226
Pacific Gas & Electric Co \| 2017 Northern California wildfires
Loss Contingencies [Line Items]
Total wildfire-related claims	3,500	3,500
Pacific Gas & Electric Co \| 2018 Camp fire
Loss Contingencies [Line Items]
Total wildfire-related claims	$ 10,500	$ 10,500

Carrying value of the obligation (known or estimated) arising from requirements to perform activities to remediate one or more sites, payable in twelve months or in the next operating cycle if longer.

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