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COMMITMENTS AND CONTINGENCIES - CAPITAL LEASES (Details) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($)
Capital Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract] |  |  |
Capital leases, current portion | $ 15 |  |
Capital leases, noncurrent portion | 1,255 |  |
Power Purchase Agreements [Member] |  |  |
Capital Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract] |  |  |
2019 | 210 |  |
2020 | 210 |  |
2021 | 211 |  |
2022 | 211 |  |
2023 | 211 |  |
Thereafter | 3,196 |  |
Total minimum payments | 4,249 |  |
Less: estimated executory costs | (480) |  |
Less: interest | (2,483) |  |
Present value of net minimum lease payments | 1,286 |  |
Power Purchase Agreement Upon Completion of Power Plant [Member] |  |  |
Capital Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract] |  |  |
Present value of net minimum lease payments | $ 16 |  |
HQ Build To Suit Lease [Member] |  |  |
Leases, Capital [Abstract] |  |  |
Capital lease term | 25 years |  |
Capital Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract] |  |  |
2019 | $ 10 |  |
2020 | 11 |  |
2021 | 11 |  |
2022 | 11 |  |
2023 | 11 |  |
Thereafter | 217 |  |
Total minimum payments | 271 |  |
Present value of net minimum lease payments | 138 |  |
Fleet And Other Capital Leases [Member] |  |  |
Capital Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract] |  |  |
2019 | 6 |  |
2020 | 2 |  |
2021 | 1 |  |
2022 | 0 |  |
2023 | 0 |  |
Thereafter | 9 |  |
Present value of net minimum lease payments | 11 |  |
Utility Fleet Leases [Member] |  |  |
Unrecorded Unconditional Purchase Obligation, Rolling Maturity [Abstract] |  |  |
Capital lease depreciation expense | 8 | $ 3 | $ 2
Infrastructure Construction And Improvements [Member] |  |  |
Unrecorded Unconditional Purchase Obligation, Rolling Maturity [Abstract] |  |  |
Estimated payments | 686 |  |
2019 | 396 |  |
2020 | 86 |  |
2021 | 43 |  |
2022 | 28 |  |
2023 | 18 |  |
Thereafter | 115 |  |
Infrastructure Construction And Improvements [Member] | SDG&E [Member] |  |  |
Unrecorded Unconditional Purchase Obligation, Rolling Maturity [Abstract] |  |  |
Construction projects, payable | 144 |  |
2019 | 43 |  |
2020 | 62 |  |
2021 | 22 |  |
2022 | 11 |  |
2023 | 2 |  |
Thereafter | 4 |  |
Infrastructure Construction And Improvements [Member] | Sempra South American Utilities [Member] |  |  |
Unrecorded Unconditional Purchase Obligation, Rolling Maturity [Abstract] |  |  |
2019 | 14 |  |
Pipelines [Member] | Sempra Mexico [Member] |  |  |
Unrecorded Unconditional Purchase Obligation, Rolling Maturity [Abstract] |  |  |
Estimated payments | 469 |  |
2019 | 287 |  |
2020 | 21 |  |
2021 | 18 |  |
2022 | 16 |  |
2023 | 16 |  |
Thereafter | 111 |  |
Natural Gas Pipelines and Ongoing Maintenance Services [Member] | Sempra Mexico [Member] |  |  |
Unrecorded Unconditional Purchase Obligation, Rolling Maturity [Abstract] |  |  |
Estimated payments | 266 |  |
Liquid Fuels Terminals [Member] | Sempra Mexico [Member] |  |  |
Unrecorded Unconditional Purchase Obligation, Rolling Maturity [Abstract] |  |  |
Estimated payments | 94 |  |
Renewables Projects [Member] | Sempra Mexico [Member] |  |  |
Unrecorded Unconditional Purchase Obligation, Rolling Maturity [Abstract] |  |  |
Estimated payments | 109 |  |
Infrastructure Improvements For Natural Gas And Electric Transmission And Distribution [Member] | SDG&E [Member] |  |  |
Unrecorded Unconditional Purchase Obligation, Rolling Maturity [Abstract] |  |  |
Construction projects, payable | 135 |  |
Sempra Renewables Construction [Member] | Sempra Renewables [Member] |  |  |
Unrecorded Unconditional Purchase Obligation, Rolling Maturity [Abstract] |  |  |
Estimated payments | 13 |  |
2019 | 6 |  |
2020 | 3 |  |
2021 | 3 |  |
2022 | 1 |  |
Sempra LNG & Midstream Construction [Member] | Sempra LNG & Midstream [Member] |  |  |
Unrecorded Unconditional Purchase Obligation, Rolling Maturity [Abstract] |  |  |
2019 | 46 |  |
San Diego Gas and Electric Company [Member] |  |  |
Leases, Capital [Abstract] |  |  |
Capital lease obligations | $ 1,272 | 732 |
San Diego Gas and Electric Company [Member] | Power Purchase Agreements [Member] |  |  |
Leases, Capital [Abstract] |  |  |
Number of power purchase agreements with Peaker Facilities, capital leases | 6 |  |
Number of power purchase agreements with Peaker Facilities, in commercial operation | 1 |  |
Capital lease obligations | $ 1,270 |  |
Unrecorded Unconditional Purchase Obligation, Rolling Maturity [Abstract] |  |  |
Capital lease depreciation expense | $ 11 | 8 | 4
San Diego Gas and Electric Company [Member] | Purchase Power Agreements With 25 Year Term [Member] |  |  |
Leases, Capital [Abstract] |  |  |
Number of power purchase agreements with Peaker Facilities, capital leases | 4 |  |
Capital lease term | 25 years |  |
San Diego Gas and Electric Company [Member] | Purchase Power Agreements With 20 Year Term [Member] |  |  |
Leases, Capital [Abstract] |  |  |
Number of power purchase agreements with Peaker Facilities, capital leases | 1 |  |
Capital lease term | 20 years |  |
San Diego Gas and Electric Company [Member] | Purchase Power Agreements With 9 Year Term [Member] |  |  |
Leases, Capital [Abstract] |  |  |
Number of power purchase agreements with Peaker Facilities, capital leases | 1 |  |
Capital lease term | 9 years |  |
San Diego Gas and Electric Company [Member] | Fleet And Other Capital Leases [Member] |  |  |
Capital Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract] |  |  |
2019 | $ 2 |  |
San Diego Gas and Electric Company [Member] | Utility Fleet Leases [Member] |  |  |
Unrecorded Unconditional Purchase Obligation, Rolling Maturity [Abstract] |  |  |
Capital lease depreciation expense | 2 | 1 | 1
San Diego Gas and Electric Company [Member] | Nuclear Plant Maintenance [Member] |  |  |
Unrecorded Unconditional Purchase Obligation, Rolling Maturity [Abstract] |  |  |
Construction projects, payable | 9 |  |
Southern California Gas Company [Member] |  |  |
Leases, Capital [Abstract] |  |  |
Capital lease obligations | 3 | 1 |
Southern California Gas Company [Member] | Fleet And Other Capital Leases [Member] |  |  |
Capital Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract] |  |  |
2019 | 3 |  |
Southern California Gas Company [Member] | Utility Fleet Leases [Member] |  |  |
Unrecorded Unconditional Purchase Obligation, Rolling Maturity [Abstract] |  |  |
Capital lease depreciation expense | $ 6 | $ 2 | $ 1

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