COMMITMENTS AND CONTINGENCIES - ENVIRONMENTAL ISSUES (Details) $ in Millions	12 Months Ended
	Dec. 31, 2023 USD ($) site	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)
Environmental Issues [Line Items]
Potential monetary sanctions threshold, actual amount	$ 55
Capital expenditures for environmental issues	107	$ 87	$ 95
Accrued liability for environmental matters, discount	$ 10
Accrued liability for environmental matters, discount rate (as a percent)	2.50%
Accrual for environmental loss contingencies	$ 53
Accrual for environmental loss contingencies, current	5
Accrual for environmental loss contingencies, noncurrent	$ 48
Environmental Loss Contingency, Noncurrent, Statement of Financial Position [Extensible Enumeration]	Liabilities, Other than Long-Term Debt, Noncurrent
Expected future payments for accruals, year one	$ 5
Expected future payments for accruals, year two	9
Expected future payments for accruals, year three	7
Expected future payments for accruals, year four	1
Expected future payments for accruals, year five	17
Expected future payments for accruals, thereafter	19
Minimum
Environmental Issues [Line Items]
Potential monetary sanctions threshold	1
SDG&E
Environmental Issues [Line Items]
Potential monetary sanctions threshold, actual amount	18
Capital expenditures for environmental issues	29	31	32
Accrual for environmental loss contingencies	16
Accrual for environmental loss contingencies, noncurrent	16
SoCalGas
Environmental Issues [Line Items]
Potential monetary sanctions threshold, actual amount	26
Capital expenditures for environmental issues	78	$ 56	$ 63
Accrued liability for environmental matters, discount	$ 10
Accrued liability for environmental matters, discount rate (as a percent)	2.50%
Accrual for environmental loss contingencies	$ 37
Accrual for environmental loss contingencies, current	5
Accrual for environmental loss contingencies, noncurrent	32
Manufactured-gas sites
Environmental Issues [Line Items]
Accrual for environmental loss contingencies	$ 33
Manufactured-gas sites | SDG&E
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	$ 33
Waste Disposal Sites
Environmental Issues [Line Items]
Accrual for environmental loss contingencies	$ 8
Waste Disposal Sites | SDG&E
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
Other hazardous waste sites
Environmental Issues [Line Items]
Accrual for environmental loss contingencies	12
Other hazardous waste sites | SDG&E
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
SONGS Sites | SDG&E
Environmental Issues [Line Items]
Estimated SONGS mitigation costs, recoverable in rates	144
SONGS mitigation costs incurred	55
SONGS mitigation costs remaining	$ 89