DERIVATIVES (Outstanding Derivative Balances) (Details) - Commodity Contract - Pacific Gas & Electric Co (Utility) - USD ($) $ in Millions	Sep. 30, 2023	Dec. 31, 2022
Derivatives And Hedging Activities [Line Items]
Netting	$ 124	$ 715
Netting	0	0
Cash Collateral	17	553
Total Derivative Balance	141	1,268
Current assets – other
Derivatives And Hedging Activities [Line Items]
Netting	121	824
Netting	(5)	(170)
Cash Collateral	15	537
Total Derivative Balance	131	1,191
Other noncurrent assets – other
Derivatives And Hedging Activities [Line Items]
Netting	238	306
Netting	0	0
Cash Collateral	0	0
Total Derivative Balance	238	306
Current liabilities – other
Derivatives And Hedging Activities [Line Items]
Gross Derivative Balance	(85)	(238)
Netting	5	170
Cash Collateral	2	16
Total Derivative Balance	(78)	(52)
Noncurrent liabilities – other
Derivatives And Hedging Activities [Line Items]
Gross Derivative Balance	(150)	(177)
Netting	0	0
Cash Collateral	0	0
Total Derivative Balance	$ (150)	$ (177)