REGULATORY ASSETS, LIABILITIES, AND BALANCING ACCOUNTS (Long-Term Regulatory Liabilities) (Details) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2022	Dec. 31, 2021
Regulatory Liabilities [Line Items]
Total long-term regulatory liabilities	$ 16,946	$ 11,999
Proceeds received from sale of transmission tower wireless licenses, to be refunded to customers	438
Authorized amount of shareholder tax benefits to be returned	7,590
Federal Energy Regulatory Commission
Regulatory Liabilities [Line Items]
Proceeds received from sale of transmission tower wireless licenses, to be refunded to customers	305
California Public Utilities Commission
Regulatory Liabilities [Line Items]
Proceeds received from sale of transmission tower wireless licenses, to be refunded to customers	133
Cost of removal obligations
Regulatory Liabilities [Line Items]
Total long-term regulatory liabilities	7,537	7,306
Recoveries in excess of AROs
Regulatory Liabilities [Line Items]
Total long-term regulatory liabilities	0	388
Public purpose programs
Regulatory Liabilities [Line Items]
Total long-term regulatory liabilities	1,066	946
Employee benefit plans
Regulatory Liabilities [Line Items]
Total long-term regulatory liabilities	1,240	1,229
Transmission tower wireless licenses
Regulatory Liabilities [Line Items]
Total long-term regulatory liabilities	438	446
SFGO sale
Regulatory Liabilities [Line Items]
Total long-term regulatory liabilities	304	343
SB 901 Securitization
Regulatory Liabilities [Line Items]
Total long-term regulatory liabilities	5,510	0
Other
Regulatory Liabilities [Line Items]
Total long-term regulatory liabilities	$ 851	$ 1,341