REVENUES - CONTRACT LIABILITIES (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2026	Sep. 30, 2025
Contract with Customer, Liability [Roll Forward]
Contract liabilities, opening balance	$ (68)	$ (196)
Revenue from performance obligations satisfied during reporting period	4	83
Payments received in advance	(1)	(1)
Reclassification to liabilities held for sale	0	45
Contract liabilities, closing balance	(65)	(69)
Balance Sheet Location [Axis]: us-gaap:DeferredCreditsAndOtherLiabilities
Contract with Customer, Liability [Roll Forward]
Contract liabilities, closing balance	(61)
Balance Sheet Location [Axis]: us-gaap:OtherLiabilitiesCurrent
Contract with Customer, Liability [Roll Forward]
Contract liabilities, closing balance	(4)
San Diego Gas and Electric Company
Contract with Customer, Liability [Roll Forward]
Contract liabilities, opening balance	(68)	(72)
Revenue from performance obligations satisfied during reporting period	3	3
Contract liabilities, closing balance	(65)	$ (69)
San Diego Gas and Electric Company \| Balance Sheet Location [Axis]: us-gaap:DeferredCreditsAndOtherLiabilities
Contract with Customer, Liability [Roll Forward]
Contract liabilities, closing balance	(61)
San Diego Gas and Electric Company \| Balance Sheet Location [Axis]: us-gaap:OtherLiabilitiesCurrent
Contract with Customer, Liability [Roll Forward]
Contract liabilities, closing balance	$ (4)