REVENUES - CONTRACT LIABILITIES (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Contract with Customer, Liability [Roll Forward]
Contract liabilities, opening balance	$ (278)	$ (207)
Revenue from performance obligations satisfied during reporting period	39	25
Contract liabilities, closing balance	(239)	(182)
Other Current Liabilities
Contract with Customer, Liability [Roll Forward]
Contract liabilities, closing balance	(78)
Deferred Credits and Other
Contract with Customer, Liability [Roll Forward]
Contract liabilities, closing balance	(161)
San Diego Gas and Electric Company
Contract with Customer, Liability [Roll Forward]
Contract liabilities, opening balance	(83)	(87)
Revenue from performance obligations satisfied during reporting period	1	1
Contract liabilities, closing balance	(82)	$ (86)
San Diego Gas and Electric Company | Other Current Liabilities
Contract with Customer, Liability [Roll Forward]
Contract liabilities, closing balance	(4)
San Diego Gas and Electric Company | Deferred Credits and Other
Contract with Customer, Liability [Roll Forward]
Contract liabilities, closing balance	$ (78)