DERIVATIVES (Outstanding Derivative Balances) (Details) - Commodity Contract - Pacific Gas & Electric Co (Utility) - USD ($) $ in Millions	Mar. 31, 2022	Dec. 31, 2021
Derivatives And Hedging Activities [Line Items]
Netting	$ (33)	$ (42)
Netting	0	0
Cash Collateral	69	170
Total Derivative Balance	36	128
Current assets – other
Derivatives And Hedging Activities [Line Items]
Netting	76	58
Netting	(5)	(9)
Cash Collateral	49	152
Total Derivative Balance	120	201
Other noncurrent assets – other
Derivatives And Hedging Activities [Line Items]
Netting	165	169
Netting	0	0
Cash Collateral	0	0
Total Derivative Balance	165	169
Current liabilities – other
Derivatives And Hedging Activities [Line Items]
Gross Derivative Balance	(61)	(53)
Netting	5	9
Cash Collateral	20	18
Total Derivative Balance	(36)	(26)
Noncurrent liabilities – other
Derivatives And Hedging Activities [Line Items]
Gross Derivative Balance	(213)	(216)
Netting	0	0
Cash Collateral	0	0
Total Derivative Balance	$ (213)	$ (216)