REGULATORY ASSETS, LIABILITIES, AND BALANCING ACCOUNTS (Long-Term Regulatory Assets) (Details) - USD ($) $ in Millions	Mar. 31, 2024	Dec. 31, 2023	Jun. 30, 2022
Regulatory Assets [Line Items]
Regulatory assets	$ 16,333	$ 17,189
Pension benefits
Regulatory Assets [Line Items]
Regulatory assets	339	348
Environmental compliance costs
Regulatory Assets [Line Items]
Regulatory assets	1,122	1,218
Price risk management
Regulatory Assets [Line Items]
Regulatory assets	166	160
Catastrophic event memorandum account
Regulatory Assets [Line Items]
Regulatory assets	1,031	1,074
Wildfire expense memorandum account
Regulatory Assets [Line Items]
Regulatory assets	2,455	2,915
Deferred income taxes
Regulatory Assets [Line Items]
Regulatory assets	3,748	3,543
Financing costs
Regulatory Assets [Line Items]
Regulatory assets	192	196
SB 901 Securitization
Regulatory Assets [Line Items]
Regulatory assets	5,247	5,249	$ 5,500
General rate case memorandum accounts
Regulatory Assets [Line Items]
Regulatory assets	992	1,291
Other
Regulatory Assets [Line Items]
Regulatory assets	$ 1,041	$ 1,195