REGULATORY ASSETS, LIABILITIES, AND BALANCING ACCOUNTS (Long-Term Regulatory Assets) (Details) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2023	Dec. 31, 2022	Jun. 30, 2022	Feb. 28, 2022
Regulatory Assets [Line Items]
Current regulatory assets	$ 309	$ 296
Regulatory assets	15,963	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]
Current regulatory assets	309	296
Deferred depreciation, interest and tax expense	100
Regulatory assets	15,963	16,443
Pension benefits
Regulatory Assets [Line Items]
Regulatory assets	109	120
Environmental compliance costs
Regulatory Assets [Line Items]
Regulatory assets	1,204	1,193
Utility retained generation
Regulatory Assets [Line Items]
Regulatory assets	63	86
Price risk management
Regulatory Assets [Line Items]
Regulatory assets	164	177
Catastrophic event memorandum account
Regulatory Assets [Line Items]
Regulatory assets	1,272	1,085
Catastrophic event memorandum account | COVID-19
Regulatory Assets [Line Items]
Regulatory assets	45	44
Wildfire expense memorandum account
Regulatory Assets [Line Items]
Regulatory assets	468	439
Fire hazard prevention memorandum account
Regulatory Assets [Line Items]
Regulatory assets	86	79
Fire risk mitigation memorandum account
Regulatory Assets [Line Items]
Regulatory assets	23	65
Wildfire mitigation plan memorandum account
Regulatory Assets [Line Items]
Regulatory assets	654	756
Deferred income taxes
Regulatory Assets [Line Items]
Regulatory assets	3,100	2,730
Insurance premium costs
Regulatory Assets [Line Items]
Regulatory assets	11	99
Wildfire mitigation balancing account
Regulatory Assets [Line Items]
Regulatory assets	$ 252	327
Wildfire mitigation balancing account | Minimum
Regulatory Assets [Line Items]
Cost percentage threshold requiring approval	115.00%
Vegetation management balancing account
Regulatory Assets [Line Items]
Regulatory assets	$ 1,652	2,276
Cost percentage threshold requiring approval	120.00%
COVID-19 Pandemic protection memorandum account
Regulatory Assets [Line Items]
Regulatory assets	$ 18	26
COVID-19 pandemic protection memorandum account, undercollection bad debt
Regulatory Assets [Line Items]
Regulatory assets	4	4
COVID-19 pandemic protection memorandum account, program and accounts receivable financing costs
Regulatory Assets [Line Items]
Regulatory assets	14	22
Microgrid memorandum account
Regulatory Assets [Line Items]
Regulatory assets	141	213
Financing costs
Regulatory Assets [Line Items]
Regulatory assets	203	211
SB 901 Securitization
Regulatory Assets [Line Items]
Regulatory assets	5,296	5,378	$ 5,500
Recoveries in excess of AROs
Regulatory Assets [Line Items]
Regulatory assets	0	120
Other
Regulatory Assets [Line Items]
Regulatory assets	$ 1,247	$ 1,063