REGULATORY ASSETS, LIABILITIES, AND BALANCING ACCOUNTS (Long-Term Regulatory Assets) (Details) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2022	Feb. 28, 2022	Dec. 31, 2021
Regulatory Assets [Line Items]
Total long-term regulatory assets	$ 15,215		$ 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]
Total long-term regulatory assets	582		708
Environmental compliance costs
Regulatory Assets [Line Items]
Total long-term regulatory assets	1,042		1,089
Utility retained generation
Regulatory Assets [Line Items]
Total long-term regulatory assets	110		133
Price risk management
Regulatory Assets [Line Items]
Total long-term regulatory assets	177		216
Catastrophic event memorandum account
Regulatory Assets [Line Items]
Total long-term regulatory assets	951		1,119
Catastrophic event memorandum account | COVID-19
Regulatory Assets [Line Items]
Total long-term regulatory assets	52		49
Wildfire expense memorandum account
Regulatory Assets [Line Items]
Total long-term regulatory assets	361		347
Fire hazard prevention memorandum account
Regulatory Assets [Line Items]
Total long-term regulatory assets	75		75
Fire risk mitigation memorandum account
Regulatory Assets [Line Items]
Total long-term regulatory assets	84		44
Wildfire mitigation plan memorandum account
Regulatory Assets [Line Items]
Total long-term regulatory assets	535		424
Deferred income taxes
Regulatory Assets [Line Items]
Total long-term regulatory assets	2,222		1,849
Insurance premium costs
Regulatory Assets [Line Items]
Total long-term regulatory assets	165		207
Wildfire mitigation balancing account
Regulatory Assets [Line Items]
Total long-term regulatory assets	$ 287		273
Wildfire mitigation balancing account | Minimum
Regulatory Assets [Line Items]
Cost percentage threshold requiring approval	115.00%
Vegetation management balancing account
Regulatory Assets [Line Items]
Total long-term regulatory assets	$ 1,557		1,411
Vegetation management balancing account | Minimum
Regulatory Assets [Line Items]
Cost percentage threshold requiring approval	120.00%
COVID-19 Pandemic protection memorandum account
Regulatory Assets [Line Items]
Total long-term regulatory assets	$ 33		49
COVID-19 pandemic protection memorandum account, undercollection bad debt
Regulatory Assets [Line Items]
Total long-term regulatory assets	12		30
COVID-19 pandemic protection memorandum account, program and accounts receivable financing costs
Regulatory Assets [Line Items]
Total long-term regulatory assets	21		19
Microgrid memorandum account
Regulatory Assets [Line Items]
Total long-term regulatory assets	165		163
Financing costs
Regulatory Assets [Line Items]
Total long-term regulatory assets	190		175
SB 901 Securitization
Regulatory Assets [Line Items]
Total long-term regulatory assets	5,492		0
Other
Regulatory Assets [Line Items]
Total long-term regulatory assets	976		925
Recoveries in excess of AROs
Regulatory Assets [Line Items]
Total long-term regulatory assets	$ 211		$ 0