REGULATORY ASSETS, LIABILITIES, AND BALANCING ACCOUNTS (Long-Term Regulatory Assets) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Jun. 30, 2022	Feb. 28, 2022	Dec. 31, 2021
Regulatory Assets [Line Items]
Regulatory assets	$ 16,443			$ 9,207
Utility retained generation asset costs	1,200
Customer Harm Threshold, post-emergence transaction, recovery bonds issued			$ 7,500
Initial shareholder contribution	2,000
Pension benefits
Regulatory Assets [Line Items]
Regulatory assets	120			708
Environmental compliance costs
Regulatory Assets [Line Items]
Regulatory assets	$ 1,193			1,089
Recovery Period	32 years
Utility retained generation
Regulatory Assets [Line Items]
Regulatory assets	$ 86			133
Recovery Period	4 years
Price risk management
Regulatory Assets [Line Items]
Regulatory assets	$ 177			216
Recovery Period	17 years
Catastrophic event memorandum account
Regulatory Assets [Line Items]
Regulatory assets	$ 1,085			1,119
Catastrophic event memorandum account | COVID-19
Regulatory Assets [Line Items]
Regulatory assets	$ 44			49
Catastrophic event memorandum account | Minimum
Regulatory Assets [Line Items]
Recovery Period	1 year
Catastrophic event memorandum account | Maximum
Regulatory Assets [Line Items]
Recovery Period	3 years
Wildfire expense memorandum account
Regulatory Assets [Line Items]
Regulatory assets	$ 439			347
Fire hazard prevention memorandum account
Regulatory Assets [Line Items]
Regulatory assets	$ 79			75
Fire hazard prevention memorandum account | Minimum
Regulatory Assets [Line Items]
Recovery Period	1 year
Fire hazard prevention memorandum account | Maximum
Regulatory Assets [Line Items]
Recovery Period	3 years
Fire risk mitigation memorandum account
Regulatory Assets [Line Items]
Regulatory assets	$ 65			44
Fire risk mitigation memorandum account | Minimum
Regulatory Assets [Line Items]
Recovery Period	1 year
Fire risk mitigation memorandum account | Maximum
Regulatory Assets [Line Items]
Recovery Period	3 years
Wildfire mitigation plan memorandum account
Regulatory Assets [Line Items]
Regulatory assets	$ 756			424
Wildfire mitigation plan memorandum account | Minimum
Regulatory Assets [Line Items]
Recovery Period	1 year
Wildfire mitigation plan memorandum account | Maximum
Regulatory Assets [Line Items]
Recovery Period	3 years
Deferred income taxes
Regulatory Assets [Line Items]
Regulatory assets	$ 2,730			1,849
Recovery Period	51 years
Insurance premium costs
Regulatory Assets [Line Items]
Regulatory assets	$ 99			207
Insurance premium costs | Minimum
Regulatory Assets [Line Items]
Recovery Period	2 years
Insurance premium costs | Maximum
Regulatory Assets [Line Items]
Recovery Period	4 years
Wildfire mitigation balancing account
Regulatory Assets [Line Items]
Regulatory assets	$ 327			273
Wildfire mitigation balancing account | Minimum
Regulatory Assets [Line Items]
Recovery Period	1 year
Cost percentage threshold requiring approval	115.00%
Wildfire mitigation balancing account | Maximum
Regulatory Assets [Line Items]
Recovery Period	3 years
Vegetation management balancing account
Regulatory Assets [Line Items]
Regulatory assets	$ 2,276			1,411
Cost percentage threshold requiring approval	120.00%
Vegetation management balancing account | Minimum
Regulatory Assets [Line Items]
Recovery Period	1 year
Vegetation management balancing account | Maximum
Regulatory Assets [Line Items]
Recovery Period	3 years
COVID-19 Pandemic protection memorandum account
Regulatory Assets [Line Items]
Regulatory assets	$ 26			49
COVID-19 pandemic protection memorandum account, undercollection bad debt
Regulatory Assets [Line Items]
Regulatory assets	4			30
COVID-19 pandemic protection memorandum account, program and accounts receivable financing costs
Regulatory Assets [Line Items]
Regulatory assets	22			19
Microgrid memorandum account
Regulatory Assets [Line Items]
Regulatory assets	$ 213			163
Microgrid memorandum account | Minimum
Regulatory Assets [Line Items]
Recovery Period	1 year
Microgrid memorandum account | Maximum
Regulatory Assets [Line Items]
Recovery Period	3 years
Financing costs
Regulatory Assets [Line Items]
Regulatory assets	$ 211			175
SB 901 Securitization
Regulatory Assets [Line Items]
Regulatory assets	$ 5,378	$ 5,500		0
Recovery Period	30 years
Recoveries in excess of AROs
Regulatory Assets [Line Items]
Regulatory assets	$ 120			0
Other
Regulatory Assets [Line Items]
Regulatory assets	$ 1,063			$ 925