DERIVATIVES (Outstanding Derivative Balances) (Details) - Commodity Contract - Pacific Gas & Electric Co (Utility) - USD ($) $ in Millions	Jun. 30, 2024	Dec. 31, 2023
Derivatives And Hedging Activities [Line Items]
Gross Derivative Balance, Asset	$ 87	$ 82
Netting, Asset	0	0
Cash Collateral	22	96
Total Derivative Balance, Asset	109	178
Current assets – other
Derivatives And Hedging Activities [Line Items]
Gross Derivative Balance, Asset	171	134
Netting, Asset	(8)	(8)
Cash Collateral	21	50
Total Derivative Balance, Asset	184	176
Other noncurrent assets – other
Derivatives And Hedging Activities [Line Items]
Gross Derivative Balance, Asset	225	280
Netting, Asset	0	0
Cash Collateral	0	0
Total Derivative Balance, Asset	225	280
Current liabilities – other
Derivatives And Hedging Activities [Line Items]
Gross Derivative Balance, Liabilities	(143)	(172)
Netting, Liabilities	8	8
Cash Collateral	1	46
Total Derivative Balance, Liabilities	(134)	(118)
Noncurrent liabilities – other
Derivatives And Hedging Activities [Line Items]
Gross Derivative Balance, Liabilities	(166)	(160)
Netting, Liabilities	0	0
Cash Collateral	0	0
Total Derivative Balance, Liabilities	$ (166)	$ (160)