DERIVATIVES (Outstanding Derivative Balances) (Details) - Commodity Contract - Pacific Gas & Electric Co (Utility) - USD ($) $ in Millions	Sep. 30, 2024	Dec. 31, 2023
Derivatives And Hedging Activities [Line Items]
Gross Derivative Balance, Asset	$ 64	$ 82
Netting, Asset	0	0
Cash Collateral	9	96
Total Derivative Balance, Asset	73	178
Current assets – other
Derivatives And Hedging Activities [Line Items]
Gross Derivative Balance, Asset	143	134
Netting, Asset	(16)	(8)
Cash Collateral	8	50
Total Derivative Balance, Asset	135	176
Other noncurrent assets – other
Derivatives And Hedging Activities [Line Items]
Gross Derivative Balance, Asset	213	280
Netting, Asset	0	0
Cash Collateral	0	0
Total Derivative Balance, Asset	213	280
Current liabilities – other
Derivatives And Hedging Activities [Line Items]
Gross Derivative Balance, Liabilities	(125)	(172)
Netting, Liabilities	16	8
Cash Collateral	1	46
Total Derivative Balance, Liabilities	(108)	(118)
Noncurrent liabilities – other
Derivatives And Hedging Activities [Line Items]
Gross Derivative Balance, Liabilities	(167)	(160)
Netting, Liabilities	0	0
Cash Collateral	0	0
Total Derivative Balance, Liabilities	$ (167)	$ (160)