REVENUES - CONTRACT LIABILITIES (Details) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021
Contract with Customer, Liability [Roll Forward]
Contract liabilities, opening balance	$ (278)	$ (207)
Revenue from performance obligations satisfied during reporting period	86	49
Payments received in advance	(105)	(1)
Contract liabilities, closing balance	(297)	(159)
Other Current Liabilities
Contract with Customer, Liability [Roll Forward]
Contract liabilities, closing balance	(81)
Deferred Credits and Other
Contract with Customer, Liability [Roll Forward]
Contract liabilities, closing balance	(216)
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	2	2
Contract liabilities, closing balance	(81)	$ (85)
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	$ (77)