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COMMITMENTS AND CONTINGENCIES - LONG-TERM PURCHASE COMMITMENT (Details) - USD ($) $ in Millions |  | 1 Months Ended | 12 Months Ended
--- | --- | --- | ---
Mar. 13, 2017 | May 31, 2017 | May 31, 2016 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Long-term Purchase Commitment [Line Items] |  |  |  |  |  |
Litigation settlement payable | $ 118 |  |  |  |  |
Sempra LNG & Midstream [Member] |  |  |  |  |  |
Long-term Purchase Commitment [Line Items] |  |  |  |  |  |
Loss on release of pipeline capacity |  |  | $ 206 |  |  |
Litigation settlement payable |  | $ 57 | 47 |  |  |
San Diego Gas and Electric Company [Member] |  |  |  |  |  |
Long-term Purchase Commitment [Line Items] |  |  |  |  |  |
Litigation settlement payable | $ 24 |  |  |  |  |
Sempra LNG & Midstream [Member] |  |  |  |  |  |
Long-term Purchase Commitment [Line Items] |  |  |  |  |  |
Loss on release of pipeline capacity net of tax |  |  | $ 123 |  |  |
Natural Gas Contracts [Member] |  |  |  |  |  |
Unrecorded Unconditional Purchase Obligation, Rolling Maturity [Abstract] |  |  |  |  |  |
2019 |  |  |  | $ 263 |  |
2020 |  |  |  | 173 |  |
2021 |  |  |  | 156 |  |
2022 |  |  |  | 85 |  |
2023 |  |  |  | 63 |  |
Thereafter |  |  |  | 280 |  |
Total estimated payments |  |  |  | 1,020 |  |
Purchases |  |  |  | 1,345 | $ 1,429 | $ 1,169
Natural Gas Contracts [Member] | SoCalGas [Member] |  |  |  |  |  |
Unrecorded Unconditional Purchase Obligation, Rolling Maturity [Abstract] |  |  |  |  |  |
2019 |  |  |  | 126 |  |
2020 |  |  |  | 122 |  |
2021 |  |  |  | 104 |  |
2022 |  |  |  | 37 |  |
2023 |  |  |  | 24 |  |
Thereafter |  |  |  | 49 |  |
Total estimated payments |  |  |  | 462 |  |
Purchases |  |  |  | 1,169 | 1,213 | 966
Natural Gas Storage and Transportation Contracts [Member] |  |  |  |  |  |
Unrecorded Unconditional Purchase Obligation, Rolling Maturity [Abstract] |  |  |  |  |  |
2019 |  |  |  | 230 |  |
2020 |  |  |  | 158 |  |
2021 |  |  |  | 144 |  |
2022 |  |  |  | 73 |  |
2023 |  |  |  | 50 |  |
Thereafter |  |  |  | 262 |  |
Total estimated payments |  |  |  | 917 |  |
Natural Gas Transportation Contracts [Member] | SoCalGas [Member] |  |  |  |  |  |
Unrecorded Unconditional Purchase Obligation, Rolling Maturity [Abstract] |  |  |  |  |  |
2019 |  |  |  | 114 |  |
2020 |  |  |  | 118 |  |
2021 |  |  |  | 104 |  |
2022 |  |  |  | 37 |  |
2023 |  |  |  | 23 |  |
Thereafter |  |  |  | 49 |  |
Total estimated payments |  |  |  | 445 |  |
Natural Gas Supply Contracts [Member] |  |  |  |  |  |
Unrecorded Unconditional Purchase Obligation, Rolling Maturity [Abstract] |  |  |  |  |  |
2019 |  |  |  | 33 |  |
2020 |  |  |  | 15 |  |
2021 |  |  |  | 12 |  |
2022 |  |  |  | 12 |  |
2023 |  |  |  | 13 |  |
Thereafter |  |  |  | 18 |  |
Total estimated payments |  |  |  | 103 |  |
Natural Gas Supply Contracts [Member] | SoCalGas [Member] |  |  |  |  |  |
Unrecorded Unconditional Purchase Obligation, Rolling Maturity [Abstract] |  |  |  |  |  |
2019 |  |  |  | 12 |  |
2020 |  |  |  | 4 |  |
2021 |  |  |  | 0 |  |
2022 |  |  |  | 0 |  |
2023 |  |  |  | 1 |  |
Thereafter |  |  |  | 0 |  |
Total estimated payments |  |  |  | 17 |  |
Liquefied Natural Gas Contracts [Member] | Sempra LNG & Midstream [Member] |  |  |  |  |  |
Unrecorded Unconditional Purchase Obligation, Rolling Maturity [Abstract] |  |  |  |  |  |
2019 |  |  |  | 289 |  |
2020 |  |  |  | 372 |  |
2021 |  |  |  | 368 |  |
2022 |  |  |  | 373 |  |
2023 |  |  |  | 385 |  |
Thereafter |  |  |  | 2,475 |  |
Total estimated payments |  |  |  | $ 4,262 |  |
Long-term Contracts [Member] | San Diego Gas and Electric Company [Member] |  |  |  |  |  |
Unrecorded Unconditional Purchase Obligation, Rolling Maturity [Abstract] |  |  |  |  |  |
Purchase commitment component percentage |  |  |  | 37.00% |  |
Renewable Energy Contracts Expiring Through 2041 [Member] | San Diego Gas and Electric Company [Member] |  |  |  |  |  |
Unrecorded Unconditional Purchase Obligation, Rolling Maturity [Abstract] |  |  |  |  |  |
Purchase commitment component percentage |  |  |  | 36.00% |  |
Other Owned Generation [Member] | San Diego Gas and Electric Company [Member] |  |  |  |  |  |
Unrecorded Unconditional Purchase Obligation, Rolling Maturity [Abstract] |  |  |  |  |  |
Purchase commitment component percentage |  |  |  | 55.00% |  |
Spot Market Purchases [Member] | San Diego Gas and Electric Company [Member] |  |  |  |  |  |
Unrecorded Unconditional Purchase Obligation, Rolling Maturity [Abstract] |  |  |  |  |  |
Purchase commitment component percentage |  |  |  | 8.00% |  |
Purchased Power Contracts [Member] |  |  |  |  |  |
Unrecorded Unconditional Purchase Obligation, Rolling Maturity [Abstract] |  |  |  |  |  |
2019 |  |  |  | $ 654 |  |
2020 |  |  |  | 629 |  |
2021 |  |  |  | 631 |  |
2022 |  |  |  | 592 |  |
2023 |  |  |  | 549 |  |
Thereafter |  |  |  | 5,185 |  |
Total estimated payments |  |  |  | 8,240 |  |
Purchases |  |  |  | 1,582 | 1,694 | 1,667
Purchased Power Contracts [Member] | SDG&E [Member] |  |  |  |  |  |
Unrecorded Unconditional Purchase Obligation, Rolling Maturity [Abstract] |  |  |  |  |  |
2019 |  |  |  | 527 |  |
2020 |  |  |  | 510 |  |
2021 |  |  |  | 510 |  |
2022 |  |  |  | 496 |  |
2023 |  |  |  | 451 |  |
Thereafter |  |  |  | 5,026 |  |
Total estimated payments |  |  |  | 7,520 |  |
Purchases |  |  |  | 712 | $ 781 | $ 752
Renewable Energy PPAs [Member] | SDG&E [Member] |  |  |  |  |  |
Unrecorded Unconditional Purchase Obligation, Rolling Maturity [Abstract] |  |  |  |  |  |
Total estimated payments |  |  |  | $ 5,200 |  |

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