OTHER CONTINGENCIES AND COMMITMENTS (CPUC and FERC Matters) (Details) $ in Thousands	Sep. 30, 2019 USD ($)	Jun. 27, 2019 violation wildfire	Sep. 21, 2018	May 17, 2018 USD ($)	Apr. 26, 2018 USD ($)	Oct. 11, 2019 USD ($)	Jun. 30, 2019 USD ($)	Jun. 28, 2019 USD ($)	Dec. 06, 2018 consultant
Loss Contingencies [Line Items]
Settlement agreement, proposed payment to California General Fund								$ 2,000
2017 Northern California wildfires
Loss Contingencies [Line Items]
Loss contingency liability	$ 7,500,000
Ex Parte Communications
Loss Contingencies [Line Items]
Settlement agreement, proposed penalty								10,000
Proposed penalty					$ 97,500
Payment to State General Fund				$ 12,000	12,000
Gas transmission and storage revenue reduction					63,500
2018 GT&S revenue requirement reduction					31,750
2019 GT&S revenue requirement reduction					31,750
Revenue requirement reduction in next GRC cycle					$ 10,000
Payment to city of San Bruno				6,000
Payment to city of San Carlos				$ 6,000
Settlement agreement, proposed forgone revenue collection, 2019 GT&S rate case								5,000
Settlement agreement, proposed forgone revenue collection, 2020 GRC cycle								1,000
Settlement agreement, proposed compensation payments								2,000
Settlement agreement, proposed compensation payments, San Bruno								$ 1,000
Disallowance of Plant Costs
Loss Contingencies [Line Items]
Accrual for GTandS revenue requirement reduction	$ 24,000
Pacific Gas & Electric Co | 2017 Northern California wildfires
Loss Contingencies [Line Items]
Number of alleged violations (violation) | violation		27
Alleged violations, number of wildfires (wildfire) | wildfire		12
Qualifications of vegetation management personnel, corrective actions, period		30 days
Pacific Gas & Electric Co | Cherokee, La Porte and Tubbs Fires
Loss Contingencies [Line Items]
Number of alleged violations (violation) | violation		0
Pacific Gas & Electric Co | 37 Fire
Loss Contingencies [Line Items]
Number of alleged violations (violation) | violation		0
Pacific Gas & Electric Co | Ex Parte Communications
Loss Contingencies [Line Items]
Loss contingency liability							$ 4,000
Pacific Gas & Electric Co | Pending Litigation | Unfavorable Regulatory Action
Loss Contingencies [Line Items]
Number of consultants retained | consultant									2
Electric | Pacific Gas & Electric Co
Loss Contingencies [Line Items]
Requested revenue rate			98.85%
Subsequent event | Pacific Gas & Electric Co | Unfavorable Regulatory Action
Loss Contingencies [Line Items]
Settlement agreement, proposed penalty						$ 65,000
Settlement agreement, proposed payment to California General Fund						5,000
Settlement agreement, proposed payment to Shareholders' initiative fund						$ 60,000