DEBT AND CREDIT FACILITIES - LINES OF CREDIT (Details) $ in Millions	Sep. 30, 2025 USD ($)
Line of Credit Facility [Line Items]
Total facility	$ 10,200
Available unused credit	8,542
Commercial paper outstanding
Line of Credit Facility [Line Items]
Line of credit outstanding	(584)
Line of Credit
Line of Credit Facility [Line Items]
Line of credit outstanding	(887)
Letters of credit outstanding
Line of Credit Facility [Line Items]
Line of credit outstanding	(187)
Other Sempra
Line of Credit Facility [Line Items]
Total facility	4,000
Available unused credit	3,854
Other Sempra | Commercial paper outstanding
Line of Credit Facility [Line Items]
Line of credit outstanding	(146)
Other Sempra | Line of Credit
Line of Credit Facility [Line Items]
Line of credit outstanding	0
Other Sempra | Letters of credit outstanding
Line of Credit Facility [Line Items]
Line of credit outstanding	0
SDG&E
Line of Credit Facility [Line Items]
Total facility	1,500
Available unused credit	1,473
SDG&E | Commercial paper outstanding
Line of Credit Facility [Line Items]
Line of credit outstanding	(27)
SDG&E | Line of Credit
Line of Credit Facility [Line Items]
Line of credit outstanding	0
SDG&E | Letters of credit outstanding
Line of Credit Facility [Line Items]
Line of credit outstanding	0
SoCalGas
Line of Credit Facility [Line Items]
Total facility	1,200
Available unused credit	789
SoCalGas | Commercial paper outstanding
Line of Credit Facility [Line Items]
Line of credit outstanding	(411)
SoCalGas | Line of Credit
Line of Credit Facility [Line Items]
Line of credit outstanding	0
SoCalGas | Letters of credit outstanding
Line of Credit Facility [Line Items]
Line of credit outstanding	0
SI Partners and IEnova | IEnova and SI Partners Committed Line Of Credit Due August 2026
Line of Credit Facility [Line Items]
Total facility	1,000
Available unused credit	1,000
SI Partners and IEnova | IEnova and SI Partners Committed Line Of Credit Due August 2026 | Commercial paper outstanding
Line of Credit Facility [Line Items]
Line of credit outstanding	0
SI Partners and IEnova | IEnova and SI Partners Committed Line Of Credit Due August 2026 | Line of Credit
Line of Credit Facility [Line Items]
Line of credit outstanding	0
SI Partners and IEnova | IEnova and SI Partners Committed Line Of Credit Due September 2025
Line of Credit Facility [Line Items]
Total facility	500
Available unused credit	104
SI Partners and IEnova | IEnova and SI Partners Committed Line Of Credit Due September 2025 | Commercial paper outstanding
Line of Credit Facility [Line Items]
Line of credit outstanding	0
SI Partners and IEnova | IEnova and SI Partners Committed Line Of Credit Due September 2025 | Line of Credit
Line of Credit Facility [Line Items]
Line of credit outstanding	(396)
SI Partners and IEnova | IEnova and SI Partners Committed Line Of Credit Due August 2028
Line of Credit Facility [Line Items]
Total facility	1,500
Available unused credit	1,009
SI Partners and IEnova | IEnova and SI Partners Committed Line Of Credit Due August 2028 | Commercial paper outstanding
Line of Credit Facility [Line Items]
Line of credit outstanding	0
SI Partners and IEnova | IEnova and SI Partners Committed Line Of Credit Due August 2028 | Line of Credit
Line of Credit Facility [Line Items]
Line of credit outstanding	(491)
SI Partners and IEnova | Letters of credit outstanding | IEnova and SI Partners Committed Line Of Credit Due August 2026
Line of Credit Facility [Line Items]
Line of credit outstanding	0
SI Partners and IEnova | Letters of credit outstanding | IEnova and SI Partners Committed Line Of Credit Due September 2025
Line of Credit Facility [Line Items]
Line of credit outstanding	0
SI Partners and IEnova | Letters of credit outstanding | IEnova and SI Partners Committed Line Of Credit Due August 2028
Line of Credit Facility [Line Items]
Line of credit outstanding	0
Port Arthur LNG I | Port Arthur LNG Committed Line Of Credit Due 2030
Line of Credit Facility [Line Items]
Total facility	200
Available unused credit	113
Port Arthur LNG I | Port Arthur LNG Committed Line Of Credit Due 2030 | Commercial paper outstanding
Line of Credit Facility [Line Items]
Line of credit outstanding	0
Port Arthur LNG I | Port Arthur LNG Committed Line Of Credit Due 2030 | Line of Credit
Line of Credit Facility [Line Items]
Line of credit outstanding	0
Port Arthur LNG I | Letters of credit outstanding | Port Arthur LNG Committed Line Of Credit Due 2030
Line of Credit Facility [Line Items]
Line of credit outstanding	(87)
Port Arthur LNG II | Port Arthur LNG II Committed Line Of Credit Due 2030
Line of Credit Facility [Line Items]
Total facility	300
Available unused credit	200
Port Arthur LNG II | Port Arthur LNG II Committed Line Of Credit Due 2030 | Commercial paper outstanding
Line of Credit Facility [Line Items]
Line of credit outstanding	0
Port Arthur LNG II | Port Arthur LNG II Committed Line Of Credit Due 2030 | Line of Credit
Line of Credit Facility [Line Items]
Line of credit outstanding	0
Port Arthur LNG II | Letters of credit outstanding | Port Arthur LNG II Committed Line Of Credit Due 2030
Line of Credit Facility [Line Items]
Total facility	300
Line of credit outstanding	$ (100)