REGULATORY MATTERS - FERC Rate Matters (Details) - SDG&E - FERC - USD ($) $ in Millions	1 Months Ended
	Dec. 31, 2024	Dec. 31, 2025	Oct. 31, 2024	Sep. 30, 2024
TO5 Settlement
Public Utilities, General Disclosures [Line Items]
Minimum common equity ratio (as a percent)		10.60%
FERC requirement to maintain common equity ratio at or above, base (as a percent)		10.10%
Settlement charges	$ 120
Settlement charges, net	89
TO5 Settlement | Electric Revenues
Public Utilities, General Disclosures [Line Items]
Settlement charges	94
TO5 Settlement | Other Income, Net
Public Utilities, General Disclosures [Line Items]
Settlement charges	$ 26
TO6 Filing
Public Utilities, General Disclosures [Line Items]
Minimum common equity ratio (as a percent)			12.25%
FERC requirement to maintain common equity ratio at or above, base (as a percent)			11.75%	10.10%