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COMMITMENTS AND CONTINGENCIES - CONTRACTUAL COMMITMENTS (Details) - Sempra LNG [Member] - Liquefied Natural Gas Contracts [Member] $ in Millions | 3 Months Ended
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Mar. 31, 2019 USD ($)
Unrecorded Unconditional Purchase Obligation [Line Items] |
Increase (decrease) in commitment amount, 2019 | $ (96)
Increase (decrease) in commitment amount, 2020 | 19
Increase (decrease) in commitment amount, 2021 | 8
Increase (decrease) in commitment amount, 2022 | 3
Increase (decrease) in commitment amount, 2023 | 2
Increase (decrease) in commitment amount, thereafter | $ 52

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- Definition Increase (Decrease) in Unrecorded Unconditional Purchase Obligation, After Five Years + References No definition available. + Details
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Namespace Prefix: | sre_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Increase (Decrease) in Unrecorded Unconditional Purchase Obligation, Remainder of Fiscal Year + References No definition available. + Details
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Namespace Prefix: | sre_
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Balance Type: | credit
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- Definition Increase (Decrease) in Unrecorded Unconditional Purchase Obligation, Year Five + References No definition available. + Details
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Namespace Prefix: | sre_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
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- Definition Increase (Decrease) in Unrecorded Unconditional Purchase Obligation, Year Four + References No definition available. + Details
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Namespace Prefix: | sre_
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- Definition Increase (Decrease) in Unrecorded Unconditional Purchase Obligation, Year Three + References No definition available. + Details
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Namespace Prefix: | sre_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
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- Definition Increase (Decrease) in Unrecorded Unconditional Purchase Obligation, Year Two + References No definition available. + Details
Name: | sre_IncreaseDecreaseinUnrecordedUnconditionalPurchaseObligationYearTwo
Namespace Prefix: | sre_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_UnrecordedUnconditionalPurchaseObligationLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | dei_LegalEntityAxis=sre_SempraLNGMidstreamMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_LongTermPurchaseCommitmentByCategoryOfItemPurchasedAxis=sre_LiquefiedNaturalGasContractsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |