SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Revenues Disaggregated by Type of Customer) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Disaggregation of Revenue [Abstract]
Total operating revenues	$ 5,888	$ 5,394	$ 17,387	$ 16,310
Electric
Disaggregation of Revenue [Abstract]
Total operating revenues	4,507	3,895	12,478	11,743
Natural gas
Disaggregation of Revenue [Abstract]
Total operating revenues	1,381	1,499	4,909	4,567
Pacific Gas & Electric Co (Utility)
Disaggregation of Revenue [Abstract]
Total operating revenues	5,888	5,394	17,387	16,310
Pacific Gas & Electric Co (Utility) | Electric
Disaggregation of Revenue [Abstract]
Total operating revenues	5,558	5,285	11,836	11,735
Regulatory balancing accounts	(1,051)	(1,390)	642	8
Total operating revenues	4,507	3,895	12,478	11,743
Pacific Gas & Electric Co (Utility) | Electric | Residential
Disaggregation of Revenue [Abstract]
Total operating revenues	2,052	2,128	4,745	4,834
Pacific Gas & Electric Co (Utility) | Electric | Commercial
Disaggregation of Revenue [Abstract]
Total operating revenues	1,818	1,711	4,245	4,135
Pacific Gas & Electric Co (Utility) | Electric | Industrial
Disaggregation of Revenue [Abstract]
Total operating revenues	579	534	1,307	1,206
Pacific Gas & Electric Co (Utility) | Electric | Agricultural
Disaggregation of Revenue [Abstract]
Total operating revenues	628	777	1,097	1,477
Pacific Gas & Electric Co (Utility) | Electric | Public street and highway lighting
Disaggregation of Revenue [Abstract]
Total operating revenues	22	20	61	57
Pacific Gas & Electric Co (Utility) | Electric | Other, net
Disaggregation of Revenue [Abstract]
Total operating revenues	459	115	381	26
Pacific Gas & Electric Co (Utility) | Natural gas
Disaggregation of Revenue [Abstract]
Total operating revenues	831	926	4,539	3,806
Regulatory balancing accounts	550	573	370	761
Total operating revenues	1,381	1,499	4,909	4,567
Pacific Gas & Electric Co (Utility) | Natural gas | Residential
Disaggregation of Revenue [Abstract]
Total operating revenues	326	392	2,900	2,243
Pacific Gas & Electric Co (Utility) | Natural gas | Commercial
Disaggregation of Revenue [Abstract]
Total operating revenues	120	162	822	703
Pacific Gas & Electric Co (Utility) | Natural gas | Transportation service only
Disaggregation of Revenue [Abstract]
Total operating revenues	364	356	1,206	1,111
Pacific Gas & Electric Co (Utility) | Natural gas | Other, net
Disaggregation of Revenue [Abstract]
Total operating revenues	$ 21	$ 16	$ (389)	$ (251)