COMMITMENTS AND CONTINGENCIES - ENVIRONMENTAL ISSUES (Details) $ in Millions	12 Months Ended
	Dec. 31, 2022 USD ($) site	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)
Environmental Issues [Line Items]
Capital expenditures for environmental issues	$ 87	$ 95	$ 76
Accrued liability for environmental matters, discount	$ 14
Accrued liability for environmental matters, discount rate (as a percent)	0.40%
Accrual for environmental loss contingencies	$ 59
Environmental Loss Contingency, Noncurrent, Statement of Financial Position [Extensible Enumeration]	Total deferred credits and other liabilities
Expected future payments for accruals, 2023	$ 5
Expected future payments for accruals, 2024	11
Expected future payments for accruals, 2025	10
Expected future payments for accruals, 2026	1
Expected future payments for accruals, 2027	17
Expected future payments for accruals, thereafter	15
Minimum
Environmental Issues [Line Items]
Potential monetary sanctions threshold	1
Sempra Energy
Environmental Issues [Line Items]
Potential monetary sanctions threshold, actual amount	59
Accrual for environmental loss contingencies, current	5
Accrual for environmental loss contingencies, noncurrent	54
San Diego Gas and Electric Company
Environmental Issues [Line Items]
Potential monetary sanctions threshold, actual amount	16
Capital expenditures for environmental issues	31	32	39
Accrual for environmental loss contingencies	16
Accrual for environmental loss contingencies, current	1
Accrual for environmental loss contingencies, noncurrent	15
SoCalGas
Environmental Issues [Line Items]
Potential monetary sanctions threshold, actual amount	21
Capital expenditures for environmental issues	56	$ 63	$ 37
Accrued liability for environmental matters, discount	$ 14
Accrued liability for environmental matters, discount rate (as a percent)	0.40%
Accrual for environmental loss contingencies	$ 42
Accrual for environmental loss contingencies, current	4
Accrual for environmental loss contingencies, noncurrent	38
Other Sempra
Environmental Issues [Line Items]
Accrual for environmental loss contingencies	1
Manufactured-gas sites
Environmental Issues [Line Items]
Accrual for environmental loss contingencies	$ 38
Manufactured-gas sites | San Diego Gas and Electric Company
Environmental Issues [Line Items]
Number of sites complete | site	3
Number of sites in process | site	0
Accrual for environmental loss contingencies	$ 0
Manufactured-gas sites | SoCalGas
Environmental Issues [Line Items]
Number of sites complete | site	39
Number of sites in process | site	3
Accrual for environmental loss contingencies	$ 38
Manufactured-gas sites | Other Sempra
Environmental Issues [Line Items]
Accrual for environmental loss contingencies	0
Waste Disposal Sites
Environmental Issues [Line Items]
Accrual for environmental loss contingencies	$ 9
Waste Disposal Sites | San Diego Gas and Electric Company
Environmental Issues [Line Items]
Number of sites complete | site	2
Number of sites in process | site	1
Accrual for environmental loss contingencies	$ 5
Waste Disposal Sites | SoCalGas
Environmental Issues [Line Items]
Number of sites complete | site	5
Number of sites in process | site	2
Accrual for environmental loss contingencies	$ 3
Waste Disposal Sites | Other Sempra
Environmental Issues [Line Items]
Accrual for environmental loss contingencies	1
Other hazardous waste sites
Environmental Issues [Line Items]
Accrual for environmental loss contingencies	12
Other hazardous waste sites | San Diego Gas and Electric Company
Environmental Issues [Line Items]
Accrual for environmental loss contingencies	11
Other hazardous waste sites | SoCalGas
Environmental Issues [Line Items]
Accrual for environmental loss contingencies	1
Other hazardous waste sites | Other Sempra
Environmental Issues [Line Items]
Accrual for environmental loss contingencies	0
SONGS Sites | San Diego Gas and Electric Company
Environmental Issues [Line Items]
Estimated SONGS mitigation costs, recoverable in rates	144
SONGS mitigation costs incurred	54
SONGS mitigation costs remaining	$ 90