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COMMITMENTS AND CONTINGENCIES - ENVIRONMENTAL ISSUES (Details) $ in Millions | 12 Months Ended
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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 |  |

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