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CONTINGENCIES AND COMMITMENTS (Tax Matters) (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2018 | Dec. 31, 2019 | Dec. 31, 2018
Disaggregation Of Revenue [Line Items] |  |  |
Unrecognized tax benefits, decrease resulting from Settlements with taxing authorities | $ 20 |  |
Pacific Gas & Electric Co | Forecast | Rate Case 2015, 2017, 2019 |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Reduction in revenue requirement |  |  | $ 325
Increase to rate base |  | $ 613 | 271
Pacific Gas & Electric Co | Forecast | Other Rate Cases, Including TO19 |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Reduction in revenue requirement |  |  | 125
Increase to rate base |  | $ 200 | $ 100

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