SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Revenues Disaggregated by Type of Customer) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Disaggregation of Revenue [Abstract]
Total operating revenues	$ 5,986	$ 5,290	$ 11,847	$ 11,499
Electric
Disaggregation of Revenue [Abstract]
Total operating revenues	4,458	3,852	8,510	7,971
Natural gas
Disaggregation of Revenue [Abstract]
Total operating revenues	1,528	1,438	3,337	3,528
Pacific Gas & Electric Co (Utility)
Disaggregation of Revenue [Abstract]
Total operating revenues	5,986	5,290	11,847	11,499
Pacific Gas & Electric Co (Utility) | Electric
Disaggregation of Revenue [Abstract]
Total revenue from contracts with customers	4,876	3,275	8,919	6,278
Regulatory balancing accounts	(418)	577	(409)	1,693
Total operating revenues	4,458	3,852	8,510	7,971
Pacific Gas & Electric Co (Utility) | Electric | Residential
Disaggregation of Revenue [Abstract]
Total revenue from contracts with customers	1,516	1,404	3,315	2,693
Pacific Gas & Electric Co (Utility) | Electric | Commercial
Disaggregation of Revenue [Abstract]
Total revenue from contracts with customers	1,655	1,283	3,160	2,427
Pacific Gas & Electric Co (Utility) | Electric | Industrial
Disaggregation of Revenue [Abstract]
Total revenue from contracts with customers	441	375	854	728
Pacific Gas & Electric Co (Utility) | Electric | Agricultural
Disaggregation of Revenue [Abstract]
Total revenue from contracts with customers	439	314	619	469
Pacific Gas & Electric Co (Utility) | Electric | Public street and highway lighting
Disaggregation of Revenue [Abstract]
Total revenue from contracts with customers	27	20	52	39
Pacific Gas & Electric Co (Utility) | Electric | Other, net
Disaggregation of Revenue [Abstract]
Total revenue from contracts with customers	798	(121)	919	(78)
Pacific Gas & Electric Co (Utility) | Natural gas
Disaggregation of Revenue [Abstract]
Total revenue from contracts with customers	686	1,021	2,987	3,708
Regulatory balancing accounts	842	417	350	(180)
Total operating revenues	1,528	1,438	3,337	3,528
Pacific Gas & Electric Co (Utility) | Natural gas | Residential
Disaggregation of Revenue [Abstract]
Total revenue from contracts with customers	213	691	1,730	2,574
Pacific Gas & Electric Co (Utility) | Natural gas | Commercial
Disaggregation of Revenue [Abstract]
Total revenue from contracts with customers	187	189	560	702
Pacific Gas & Electric Co (Utility) | Natural gas | Transportation service only
Disaggregation of Revenue [Abstract]
Total revenue from contracts with customers	424	398	899	842
Pacific Gas & Electric Co (Utility) | Natural gas | Other, net
Disaggregation of Revenue [Abstract]
Total revenue from contracts with customers	$ (138)	$ (257)	$ (202)	$ (410)