OTHER CONTINGENCIES AND COMMITMENTS (Enforcement Matters) (Details) - USD ($) $ in Thousands				12 Months Ended
	Sep. 21, 2018	May 17, 2018	Apr. 26, 2018	Dec. 31, 2018
Pacific Gas & Electric Co | Electric
Loss Contingencies [Line Items]
Requested revenue rate	98.85%
Ex Parte Communications
Loss Contingencies [Line Items]
Proposed penalty			$ 97,500
Payment to State General Fund		$ 12,000	12,000
Gas transmission and storage revenue reduction			63,500
2018 GTandS revenue requirement reduction			31,750
2019 GTandS revenue requirement reduction			31,750
Revenue requirement reduction in Next GRC cycle			10,000
Payment to city of San Bruno		6,000	6,000
Payment to city of San Carlos		$ 6,000	$ 6,000
Disallowance of Plant Costs
Loss Contingencies [Line Items]
Accrual for GTandS revenue requirement reduction				$ 32,000