REGULATORY ASSETS, LIABILITIES, AND BALANCING ACCOUNTS (Long-Term Regulatory Assets) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Jun. 30, 2022	Feb. 28, 2022
Regulatory Assets [Line Items]
Regulatory assets	$ 17,189	$ 16,443
Utility retained generation asset costs	1,200
Customer Harm Threshold, post-emergence transaction, recovery bonds issued				$ 7,500
Initial shareholder contribution	2,000
Pacific Gas & Electric Co (Utility)
Regulatory Assets [Line Items]
Regulatory assets	17,189	16,443
Pension benefits
Regulatory Assets [Line Items]
Regulatory assets	348	120
Environmental compliance costs
Regulatory Assets [Line Items]
Regulatory assets	$ 1,218	1,193
Recovery Period	32 years
Utility retained generation
Regulatory Assets [Line Items]
Regulatory assets	$ 39	86
Recovery Period	4 years
Price risk management
Regulatory Assets [Line Items]
Regulatory assets	$ 160	177
Recovery Period	16 years 6 months
Catastrophic event memorandum account
Regulatory Assets [Line Items]
Regulatory assets	$ 1,074	1,085
Catastrophic event memorandum account | COVID-19
Regulatory Assets [Line Items]
Regulatory assets	$ 43	44
Catastrophic event memorandum account | Minimum
Regulatory Assets [Line Items]
Recovery Period	1 year
Catastrophic event memorandum account | Maximum
Regulatory Assets [Line Items]
Recovery Period	3 years
Wildfire expense memorandum account
Regulatory Assets [Line Items]
Regulatory assets	$ 540	439
Fire hazard prevention memorandum account
Regulatory Assets [Line Items]
Regulatory assets	$ 7	79
Fire hazard prevention memorandum account | Minimum
Regulatory Assets [Line Items]
Recovery Period	1 year
Fire hazard prevention memorandum account | Maximum
Regulatory Assets [Line Items]
Recovery Period	2 years
Fire risk mitigation memorandum account
Regulatory Assets [Line Items]
Regulatory assets	$ 110	65
Fire risk mitigation memorandum account | Minimum
Regulatory Assets [Line Items]
Recovery Period	1 year
Fire risk mitigation memorandum account | Maximum
Regulatory Assets [Line Items]
Recovery Period	3 years
Wildfire mitigation plan memorandum account
Regulatory Assets [Line Items]
Regulatory assets	$ 541	756
Wildfire mitigation plan memorandum account | Minimum
Regulatory Assets [Line Items]
Recovery Period	1 year
Wildfire mitigation plan memorandum account | Maximum
Regulatory Assets [Line Items]
Recovery Period	3 years
Deferred income taxes
Regulatory Assets [Line Items]
Regulatory assets	$ 3,543	2,730
Recovery Period	51 years
Insurance premium costs
Regulatory Assets [Line Items]
Regulatory assets	$ 1	99
Insurance premium costs | Minimum
Regulatory Assets [Line Items]
Recovery Period	2 years
Insurance premium costs | Maximum
Regulatory Assets [Line Items]
Recovery Period	4 years
Wildfire mitigation balancing account
Regulatory Assets [Line Items]
Regulatory assets	$ 120	327
Wildfire mitigation balancing account | Minimum
Regulatory Assets [Line Items]
Recovery Period	1 year
Cost percentage threshold requiring approval	115.00%
Wildfire mitigation balancing account | Maximum
Regulatory Assets [Line Items]
Recovery Period	4 years
Vegetation management balancing account
Regulatory Assets [Line Items]
Regulatory assets	$ 1,538	2,276
Cost percentage threshold requiring approval	120.00%
Vegetation management balancing account | Minimum
Regulatory Assets [Line Items]
Recovery Period	1 year
Vegetation management balancing account | Maximum
Regulatory Assets [Line Items]
Recovery Period	3 years
COVID-19 Pandemic protection memorandum account
Regulatory Assets [Line Items]
Regulatory assets	$ 17	26
COVID-19 Pandemic protection memorandum account | Minimum
Regulatory Assets [Line Items]
Recovery Period	1 year
COVID-19 Pandemic protection memorandum account | Maximum
Regulatory Assets [Line Items]
Recovery Period	3 years
COVID-19 pandemic protection memorandum account, undercollection bad debt
Regulatory Assets [Line Items]
Regulatory assets	$ 5	4
COVID-19 pandemic protection memorandum account, program and accounts receivable financing costs
Regulatory Assets [Line Items]
Regulatory assets	12	22
Microgrid memorandum account
Regulatory Assets [Line Items]
Regulatory assets	$ 59	213
Microgrid memorandum account | Minimum
Regulatory Assets [Line Items]
Recovery Period	1 year
Microgrid memorandum account | Maximum
Regulatory Assets [Line Items]
Recovery Period	3 years
Financing costs
Regulatory Assets [Line Items]
Regulatory assets	$ 196	211
SB 901 Securitization
Regulatory Assets [Line Items]
Regulatory assets	$ 5,249	5,378	$ 5,500
Recovery Period	30 years
Recoveries in excess of AROs
Regulatory Assets [Line Items]
Regulatory assets	$ 73	120
General rate case memorandum accounts
Regulatory Assets [Line Items]
Regulatory assets	$ 1,291	0
General rate case memorandum accounts | Minimum
Regulatory Assets [Line Items]
Recovery Period	1 year
General rate case memorandum accounts | Maximum
Regulatory Assets [Line Items]
Recovery Period	2 years
Other
Regulatory Assets [Line Items]
Regulatory assets	$ 1,065	$ 1,063