REGULATORY ASSETS, LIABILITIES, AND BALANCING ACCOUNTS (Long-Term Regulatory Liabilities) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Jun. 30, 2022
Regulatory Liabilities [Line Items]
Total noncurrent regulatory liabilities	$ 19,444	$ 17,630
Proceeds received from sale of transmission tower wireless licenses, to be refunded to customers	384
Authorized amount of shareholder tax benefits to be returned	7,590
Pacific Gas & Electric Co (Utility)
Regulatory Liabilities [Line Items]
Current regulatory liabilities	1,200	1,100
Total noncurrent regulatory liabilities	19,444	17,630
Federal Energy Regulatory Commission
Regulatory Liabilities [Line Items]
Proceeds received from sale of transmission tower wireless licenses, to be refunded to customers	288
California Public Utilities Commission
Regulatory Liabilities [Line Items]
Proceeds received from sale of transmission tower wireless licenses, to be refunded to customers	96
Cost of removal obligations
Regulatory Liabilities [Line Items]
Total noncurrent regulatory liabilities	8,191	7,773
Public purpose programs
Regulatory Liabilities [Line Items]
Total noncurrent regulatory liabilities	1,238	1,062
Employee benefit plans
Regulatory Liabilities [Line Items]
Total noncurrent regulatory liabilities	1,032	904
Transmission tower wireless licenses
Regulatory Liabilities [Line Items]
Total noncurrent regulatory liabilities	384	430
SFGO sale
Regulatory Liabilities [Line Items]
Total noncurrent regulatory liabilities	185	264
SB 901 Securitization
Regulatory Liabilities [Line Items]
Total noncurrent regulatory liabilities	6,628	5,800	$ 5,540
Wildfire self-insurance
Regulatory Liabilities [Line Items]
Total noncurrent regulatory liabilities	407	0
Other
Regulatory Liabilities [Line Items]
Total noncurrent regulatory liabilities	$ 1,379	$ 1,397