DEBT AND CREDIT FACILITIES - LINES OF CREDIT (Details) $ in Millions	Mar. 31, 2026 USD ($)
Line of Credit Facility [Line Items]
Total facility	$ 10,200
Available unused credit	7,946
Commercial paper outstanding
Line of Credit Facility [Line Items]
Line of credit outstanding	(1,560)
Line of Credit
Line of Credit Facility [Line Items]
Line of credit outstanding	(431)
Letters of credit outstanding
Line of Credit Facility [Line Items]
Line of credit outstanding	(263)
Other Sempra
Line of Credit Facility [Line Items]
Total facility	4,000
Available unused credit	2,539
Other Sempra | Commercial paper outstanding
Line of Credit Facility [Line Items]
Line of credit outstanding	(1,461)
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	1,500
SDG&E | Commercial paper outstanding
Line of Credit Facility [Line Items]
Line of credit outstanding	0
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	1,101
SoCalGas | Commercial paper outstanding
Line of Credit Facility [Line Items]
Line of credit outstanding	(99)
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 | SI Partners and IEnova Committed Line Of Credit Due September 2026
Line of Credit Facility [Line Items]
Total facility	500
Available unused credit	355
SI Partners and IEnova | SI Partners and IEnova Committed Line Of Credit Due September 2026 | Commercial paper outstanding
Line of Credit Facility [Line Items]
Line of credit outstanding	0
SI Partners and IEnova | SI Partners and IEnova Committed Line Of Credit Due September 2026 | Line of Credit
Line of Credit Facility [Line Items]
Line of credit outstanding	(145)
SI Partners and IEnova | SI Partners and IEnova Committed Line Of Credit Due August 2028
Line of Credit Facility [Line Items]
Total facility	1,500
Available unused credit	1,214
SI Partners and IEnova | SI Partners and IEnova 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 | SI Partners and IEnova Committed Line Of Credit Due August 2028 | Line of Credit
Line of Credit Facility [Line Items]
Line of credit outstanding	(286)
SI Partners and IEnova | SI Partners and IEnova Committed Line Of Credit Due December 2028
Line of Credit Facility [Line Items]
Total facility	1,000
Available unused credit	1,000
SI Partners and IEnova | SI Partners and IEnova Committed Line Of Credit Due December 2028 | Commercial paper outstanding
Line of Credit Facility [Line Items]
Line of credit outstanding	0
SI Partners and IEnova | SI Partners and IEnova Committed Line Of Credit Due December 2028 | Line of Credit
Line of Credit Facility [Line Items]
Line of credit outstanding	0
SI Partners and IEnova | Letters of credit outstanding | SI Partners and IEnova Committed Line Of Credit Due September 2026
Line of Credit Facility [Line Items]
Line of credit outstanding	0
SI Partners and IEnova | Letters of credit outstanding | SI Partners and IEnova Committed Line Of Credit Due August 2028
Line of Credit Facility [Line Items]
Line of credit outstanding	0
SI Partners and IEnova | Letters of credit outstanding | SI Partners and IEnova Committed Line Of Credit Due December 2028
Line of Credit Facility [Line Items]
Line of credit outstanding	0
Port Arthur LNG I | Port Arthur LNG I Committed Line Of Credit Due March 2030
Line of Credit Facility [Line Items]
Total facility	200
Available unused credit	113
Port Arthur LNG I | Port Arthur LNG I Committed Line Of Credit Due March 2030 | Commercial paper outstanding
Line of Credit Facility [Line Items]
Line of credit outstanding	0
Port Arthur LNG I | Port Arthur LNG I Committed Line Of Credit Due March 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 I Committed Line Of Credit Due March 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 September 2030
Line of Credit Facility [Line Items]
Total facility	300
Available unused credit	124
Port Arthur LNG II | Port Arthur LNG II Committed Line Of Credit Due September 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 September 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 September 2030
Line of Credit Facility [Line Items]
Line of credit outstanding	$ (176)