SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Revenues Disaggregated by Type of Customer) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Disaggregation of Revenue [Abstract]
Total operating revenues	$ 5,941	$ 5,888	$ 17,788	$ 17,387
Electric
Disaggregation of Revenue [Abstract]
Total operating revenues	4,538	4,507	13,048	12,478
Natural gas
Disaggregation of Revenue [Abstract]
Total operating revenues	1,403	1,381	4,740	4,909
Pacific Gas & Electric Co (Utility)
Disaggregation of Revenue [Abstract]
Total operating revenues	5,941	5,888	17,788	17,387
Pacific Gas & Electric Co (Utility) | Electric
Disaggregation of Revenue [Abstract]
Total revenue from contracts with customers	5,851	5,558	14,770	11,836
Regulatory balancing accounts	(1,313)	(1,051)	(1,722)	642
Total operating revenues	4,538	4,507	13,048	12,478
Pacific Gas & Electric Co (Utility) | Electric | Residential
Disaggregation of Revenue [Abstract]
Total revenue from contracts with customers	2,572	2,052	5,887	4,745
Pacific Gas & Electric Co (Utility) | Electric | Commercial
Disaggregation of Revenue [Abstract]
Total revenue from contracts with customers	2,301	1,818	5,461	4,245
Pacific Gas & Electric Co (Utility) | Electric | Industrial
Disaggregation of Revenue [Abstract]
Total revenue from contracts with customers	707	579	1,561	1,307
Pacific Gas & Electric Co (Utility) | Electric | Agricultural
Disaggregation of Revenue [Abstract]
Total revenue from contracts with customers	802	628	1,421	1,097
Pacific Gas & Electric Co (Utility) | Electric | Public street and highway lighting
Disaggregation of Revenue [Abstract]
Total revenue from contracts with customers	26	22	78	61
Pacific Gas & Electric Co (Utility) | Electric | Other, net
Disaggregation of Revenue [Abstract]
Total revenue from contracts with customers	(557)	459	362	381
Pacific Gas & Electric Co (Utility) | Natural gas
Disaggregation of Revenue [Abstract]
Total revenue from contracts with customers	1,027	831	4,014	4,539
Regulatory balancing accounts	376	550	726	370
Total operating revenues	1,403	1,381	4,740	4,909
Pacific Gas & Electric Co (Utility) | Natural gas | Residential
Disaggregation of Revenue [Abstract]
Total revenue from contracts with customers	412	326	2,142	2,900
Pacific Gas & Electric Co (Utility) | Natural gas | Commercial
Disaggregation of Revenue [Abstract]
Total revenue from contracts with customers	163	120	723	822
Pacific Gas & Electric Co (Utility) | Natural gas | Transportation service only
Disaggregation of Revenue [Abstract]
Total revenue from contracts with customers	408	364	1,307	1,206
Pacific Gas & Electric Co (Utility) | Natural gas | Other, net
Disaggregation of Revenue [Abstract]
Total revenue from contracts with customers	$ 44	$ 21	$ (158)	$ (389)