DEBT AND CREDIT FACILITIES - NARRATIVE (Details) $ in Millions	9 Months Ended
	Sep. 30, 2025 USD ($) lineOfCredit
Line of Credit Facility [Line Items]
Total facility	$ 10,200
Primary committed lines of credit | lineOfCredit	8
Ratio of indebtedness to net capital (in percent)	0.65
SDG&E
Line of Credit Facility [Line Items]
Total facility	$ 1,500
Ratio of indebtedness to net capital (in percent)	0.65
SoCalGas
Line of Credit Facility [Line Items]
Total facility	$ 1,200
Ratio of indebtedness to net capital (in percent)	0.65
SI Partners and IEnova
Line of Credit Facility [Line Items]
Number of lines of credit | lineOfCredit	3
SI Partners
Line of Credit Facility [Line Items]
Maximum adjustment EBITDA allowed	5.25
Guarantees, carrying value	$ 300
SI Partners | Letters of credit outstanding
Line of Credit Facility [Line Items]
Total facility	1,500
ECA LNG Phase 1 | Uncommitted line of credit
Line of Credit Facility [Line Items]
Total facility	100
Line of credit, amount outstanding	$ 10
Credit adjustment spread	0.10%
ECA LNG Phase 1 | Interbank Equilibrium Interest Rate | Uncommitted line of credit
Line of Credit Facility [Line Items]
Variable percentage rate (in percent)	1.54%
ECA LNG Phase 1 | Secured Overnight Financing Rate (SOFR) | Uncommitted line of credit
Line of Credit Facility [Line Items]
Variable percentage rate (in percent)	1.64%