DEBT AND CREDIT FACILITIES - COMMITTED LINES OF CREDIT (Details) $ in Millions	1 Months Ended			12 Months Ended
	Oct. 31, 2023 lender	Sep. 30, 2023 USD ($)	Aug. 31, 2023 USD ($)	Oct. 31, 2028 USD ($) lender	Sep. 29, 2023 USD ($)	Mar. 31, 2023 USD ($)
Line of Credit Facility [Line Items]
Maximum borrowing capacity		$ 9,900
Available unused credit		7,933
Forecast
Line of Credit Facility [Line Items]
Number of lenders | lender				22
Subsequent Event
Line of Credit Facility [Line Items]
Number of lenders | lender	23
Letters of credit outstanding
Line of Credit Facility [Line Items]
Line of credit outstanding		(25)
Commercial paper outstanding
Line of Credit Facility [Line Items]
Line of credit outstanding		(1,391)
Amounts outstanding
Line of Credit Facility [Line Items]
Line of credit outstanding		(551)
Sempra
Line of Credit Facility [Line Items]
Maximum borrowing capacity		4,000
Available unused credit		3,030
Sempra | Forecast
Line of Credit Facility [Line Items]
Maximum borrowing capacity				$ 3,845
Sempra | Letters of credit outstanding
Line of Credit Facility [Line Items]
Line of credit outstanding		0
Sempra | Commercial paper outstanding
Line of Credit Facility [Line Items]
Line of credit outstanding		(970)
Sempra | Amounts outstanding
Line of Credit Facility [Line Items]
Line of credit outstanding		0
San Diego Gas and Electric Company
Line of Credit Facility [Line Items]
Maximum borrowing capacity		1,500
Available unused credit		1,500
San Diego Gas and Electric Company | Forecast
Line of Credit Facility [Line Items]
Maximum borrowing capacity				1,442
San Diego Gas and Electric Company | Letters of credit outstanding
Line of Credit Facility [Line Items]
Line of credit outstanding		0
San Diego Gas and Electric Company | Commercial paper outstanding
Line of Credit Facility [Line Items]
Line of credit outstanding		0
San Diego Gas and Electric Company | Amounts outstanding
Line of Credit Facility [Line Items]
Line of credit outstanding		0
Southern California Gas Company
Line of Credit Facility [Line Items]
Maximum borrowing capacity		1,200
Available unused credit		779
Southern California Gas Company | Forecast
Line of Credit Facility [Line Items]
Maximum borrowing capacity				$ 1,153
Southern California Gas Company | Letters of credit outstanding
Line of Credit Facility [Line Items]
Line of credit outstanding		0
Southern California Gas Company | Commercial paper outstanding
Line of Credit Facility [Line Items]
Line of credit outstanding		(421)
Southern California Gas Company | Amounts 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 Facility [Line Items]
Maximum borrowing capacity		500			$ 350
Available unused credit		$ 150
Variable percentage rate (in percent)		0.80%
SI Partners and IEnova | IEnova and SI Partners Committed Line Of Credit Due September 2025 | 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]
Maximum borrowing capacity		1,000	$ 1,500
Available unused credit		1,000
SI Partners and IEnova | IEnova and SI Partners Committed Line Of Credit Due August 2026 | Secured Overnight Financing Rate (SOFR)
Line of Credit Facility [Line Items]
Variable percentage rate (in percent)			0.10%
SI Partners and IEnova | IEnova and SI Partners Committed Line Of Credit Due August 2026 | 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 2028
Line of Credit Facility [Line Items]
Maximum borrowing capacity		1,500
Available unused credit		1,299
SI Partners and IEnova | IEnova and SI Partners Committed Line Of Credit Due August 2028 | Letters of credit outstanding
Line of Credit Facility [Line Items]
Line of credit outstanding		0
SI Partners and IEnova | Commercial paper 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 | Commercial paper 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 | Commercial paper outstanding | IEnova and SI Partners Committed Line Of Credit Due August 2028
Line of Credit Facility [Line Items]
Line of credit outstanding		0
SI Partners and IEnova | Amounts outstanding | IEnova and SI Partners Committed Line Of Credit Due September 2025
Line of Credit Facility [Line Items]
Line of credit outstanding		(350)
SI Partners and IEnova | Amounts 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 | Amounts outstanding | IEnova and SI Partners Committed Line Of Credit Due August 2028
Line of Credit Facility [Line Items]
Line of credit outstanding		(201)
SI Partners and IEnova | Line of Credit | IEnova And SI Partners Committed Line Of Credit Due December 2023
Line of Credit Facility [Line Items]
Termination of debt		150
Port Arthur LNG | Port Arthur LNG Committed Line Of Credit Due 2030
Line of Credit Facility [Line Items]
Maximum borrowing capacity		200
Available unused credit		175
Port Arthur LNG | Port Arthur LNG Committed Line Of Credit Due 2030 | Letters of credit outstanding
Line of Credit Facility [Line Items]
Maximum borrowing capacity						$ 200
Line of credit outstanding		(25)
Port Arthur LNG | Commercial paper outstanding | Port Arthur LNG Committed Line Of Credit Due 2030
Line of Credit Facility [Line Items]
Line of credit outstanding		0
Port Arthur LNG | Amounts outstanding | Port Arthur LNG Committed Line Of Credit Due 2030
Line of Credit Facility [Line Items]
Line of credit outstanding		$ 0
Port Arthur LNG | Line of Credit | Port Arthur LNG Committed Line Of Credit Due 2030
Line of Credit Facility [Line Items]
Maximum borrowing capacity						$ 200