DERIVATIVES (Outstanding Derivative Balances) (Details) - Commodity Contract - Pacific Gas & Electric Co (Utility) - USD ($) $ in Millions	Mar. 31, 2023	Dec. 31, 2022
Derivatives And Hedging Activities [Line Items]
Netting	$ 246	$ 715
Netting	0	0
Cash Collateral	74	553
Total Derivative Balance	320	1,268
Current assets – other
Derivatives And Hedging Activities [Line Items]
Netting	151	824
Netting	(7)	(170)
Cash Collateral	58	537
Total Derivative Balance	202	1,191
Other noncurrent assets – other
Derivatives And Hedging Activities [Line Items]
Netting	325	306
Netting		0
Cash Collateral	0	0
Total Derivative Balance	325	306
Current liabilities – other
Derivatives And Hedging Activities [Line Items]
Gross Derivative Balance	(71)	(238)
Netting	7	170
Cash Collateral	16	16
Total Derivative Balance	(48)	(52)
Noncurrent liabilities – other
Derivatives And Hedging Activities [Line Items]
Gross Derivative Balance	(159)	(177)
Netting		0
Cash Collateral	0	0
Total Derivative Balance	$ (159)	$ (177)