REVENUES - CONTRACT LIABILITIES (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Contract with Customer, Liability [Roll Forward]
Beginning balance	$ (207)	$ (163)	$ (70)
Revenue from performance obligations satisfied during reporting period	52	4	2
Payments received in advance	(123)	(48)	(95)
Ending balance	(278)	(207)	(163)
Other Current Liabilities
Contract with Customer, Liability [Roll Forward]
Beginning balance	(52)	(4)
Ending balance	(116)	(52)	(4)
Deferred Credits and Other
Contract with Customer, Liability [Roll Forward]
Beginning balance	(155)	(159)
Ending balance	(162)	(155)	(159)
San Diego Gas and Electric Company [Member]
Contract with Customer, Liability [Roll Forward]
Beginning balance	(87)	(91)	0
Revenue from performance obligations satisfied during reporting period	4	4	1
Payments received in advance	0	0	(92)
Ending balance	(83)	(87)	(91)
San Diego Gas and Electric Company [Member] | Other Current Liabilities
Contract with Customer, Liability [Roll Forward]
Beginning balance	(4)	(4)
Ending balance	(4)	(4)	(4)
San Diego Gas and Electric Company [Member] | Deferred Credits and Other
Contract with Customer, Liability [Roll Forward]
Beginning balance	(83)	(87)
Ending balance	$ (79)	$ (83)	$ (87)