DERIVATIVES (Outstanding Derivative Balances) (Details) - Commodity Contract - Pacific Gas & Electric Co (Utility) - USD ($) $ in Millions	Mar. 31, 2024	Dec. 31, 2023
Derivatives And Hedging Activities [Line Items]
Netting	$ 118	$ 82
Netting	0	0
Cash Collateral	7	96
Total Derivative Balance	125	178
Current assets – other
Derivatives And Hedging Activities [Line Items]
Netting	156	134
Netting	(6)	(8)
Cash Collateral	5	50
Total Derivative Balance	155	176
Other noncurrent assets – other
Derivatives And Hedging Activities [Line Items]
Netting	254	280
Netting	0	0
Cash Collateral	0	0
Total Derivative Balance	254	280
Current liabilities – other
Derivatives And Hedging Activities [Line Items]
Gross Derivative Balance	(126)	(172)
Netting	6	8
Cash Collateral	2	46
Total Derivative Balance	(118)	(118)
Noncurrent liabilities – other
Derivatives And Hedging Activities [Line Items]
Gross Derivative Balance	(166)	(160)
Netting	0	0
Cash Collateral	0	0
Total Derivative Balance	$ (166)	$ (160)