REGULATORY ASSETS, LIABILITIES, AND BALANCING ACCOUNTS (Long-Term Regulatory Liabilities) (Details) - USD ($) $ in Millions	Mar. 31, 2024	Dec. 31, 2023	Jun. 30, 2022
Regulatory Liabilities [Line Items]
Total noncurrent regulatory liabilities	$ 19,667	$ 19,444
Cost of removal obligations
Regulatory Liabilities [Line Items]
Total noncurrent regulatory liabilities	8,355	8,191
Public purpose programs
Regulatory Liabilities [Line Items]
Total noncurrent regulatory liabilities	1,300	1,238
Employee benefit plans
Regulatory Liabilities [Line Items]
Total noncurrent regulatory liabilities	1,037	1,032
Transmission tower wireless licenses
Regulatory Liabilities [Line Items]
Total noncurrent regulatory liabilities	342	384
SFGO sale
Regulatory Liabilities [Line Items]
Total noncurrent regulatory liabilities	138	185
SB 901 Securitization
Regulatory Liabilities [Line Items]
Total noncurrent regulatory liabilities	6,550	6,628	$ 5,540
Wildfire self-insurance
Regulatory Liabilities [Line Items]
Total noncurrent regulatory liabilities	498	407
Other
Regulatory Liabilities [Line Items]
Total noncurrent regulatory liabilities	$ 1,447	$ 1,379