REGULATORY ASSETS, LIABILITIES, AND BALANCING ACCOUNTS (Long-Term Regulatory Assets) (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2023	Dec. 31, 2022	Jun. 30, 2022	Feb. 28, 2022
Regulatory Assets [Line Items]
Current regulatory assets	$ 355	$ 296
Regulatory assets	16,444	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	355	296
Deferred depreciation, interest and tax expense	150
Regulatory assets	16,444	16,443
Pension benefits
Regulatory Assets [Line Items]
Regulatory assets	103	120
Environmental compliance costs
Regulatory Assets [Line Items]
Regulatory assets	1,216	1,193
Utility retained generation
Regulatory Assets [Line Items]
Regulatory assets	51	86
Price risk management
Regulatory Assets [Line Items]
Regulatory assets	150	177
Catastrophic event memorandum account
Regulatory Assets [Line Items]
Regulatory assets	1,072	1,085
Catastrophic event memorandum account | COVID-19
Regulatory Assets [Line Items]
Regulatory assets	44	44
Wildfire expense memorandum account
Regulatory Assets [Line Items]
Regulatory assets	517	439
Fire hazard prevention memorandum account
Regulatory Assets [Line Items]
Regulatory assets	54	79
Fire risk mitigation memorandum account
Regulatory Assets [Line Items]
Regulatory assets	24	65
Wildfire mitigation plan memorandum account
Regulatory Assets [Line Items]
Regulatory assets	778	756
Deferred income taxes
Regulatory Assets [Line Items]
Regulatory assets	3,275	2,730
Insurance premium costs
Regulatory Assets [Line Items]
Regulatory assets	0	99
Wildfire mitigation balancing account
Regulatory Assets [Line Items]
Regulatory assets	$ 225	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	$ 1,930	2,276
Cost percentage threshold requiring approval	120.00%
COVID-19 Pandemic protection memorandum account
Regulatory Assets [Line Items]
Regulatory assets	$ 16	26
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	11	22
Microgrid memorandum account
Regulatory Assets [Line Items]
Regulatory assets	82	213
Financing costs
Regulatory Assets [Line Items]
Regulatory assets	199	211
SB 901 Securitization
Regulatory Assets [Line Items]
Regulatory assets	5,252	5,378	$ 5,500
Recoveries in excess of AROs
Regulatory Assets [Line Items]
Regulatory assets	173	120
Other
Regulatory Assets [Line Items]
Regulatory assets	$ 1,327	$ 1,063