v3.4.0.3

FAIR VALUE MEASUREMENTS - RECURRING FAIR VALUE MEASURES (Details) - USD ($) $ in Millions | Mar. 31, 2016 | Dec. 31, 2015
--- | --- | ---
Nuclear Decommisioning Trusts [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Nuclear decommissioning trusts - equity securities |  | $ 623 | $ 619
Nuclear decommissioning trusts - Debt securities issued by the U.S. Treasury and other U.S. government corporations and agencies |  | 105 | 91
Nuclear decommissioning trusts - Municipal bonds |  | 156 | 156
Nuclear decommissioning trusts - Other securities |  | 190 | 182
Nuclear decommissioning trusts - Total debt securities |  | 451 | 429
Total nuclear decommissioning trusts | [1] | 1,074 | 1,048
Derivative Financial Instruments Assets [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Interest rate and foreign exchange instruments |  | 8 | 5
Commodity contracts not subject to rate recovery, assets |  | 40 | 34
Commodity contracts subject to rate recovery, assets |  | 101 | 101
Total |  | 1,223 | 1,188
Derivative Financial Instruments Liabilities [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Interest rate and foreign exchange instruments |  | 181 | 171
Commodity contracts not subject to rate recovery, liabilities |  | 2 | 4
Commodity contracts subject to rate recovery, liabilities |  | 69 | 67
Total |  | 252 | 242
San Diego Gas and Electric Company [Member] | Nuclear Decommisioning Trusts [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Nuclear decommissioning trusts - equity securities |  | 623 | 619
Nuclear decommissioning trusts - Debt securities issued by the U.S. Treasury and other U.S. government corporations and agencies |  | 105 | 91
Nuclear decommissioning trusts - Municipal bonds |  | 156 | 156
Nuclear decommissioning trusts - Other securities |  | 190 | 182
Nuclear decommissioning trusts - Total debt securities |  | 451 | 429
Total nuclear decommissioning trusts | [1] | 1,074 | 1,048
San Diego Gas and Electric Company [Member] | Derivative Financial Instruments Assets [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Commodity contracts not subject to rate recovery, assets |  | 2 | 1
Commodity contracts subject to rate recovery, assets |  | 98 | 99
Total |  | 1,174 | 1,148
San Diego Gas and Electric Company [Member] | Derivative Financial Instruments Liabilities [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Interest rate instruments |  | 39 | 37
Commodity contracts not subject to rate recovery, liabilities |  | 0 | 0
Commodity contracts subject to rate recovery, liabilities |  | 68 | 66
Total |  | 107 | 103
Southern California Gas Company [Member] | Derivative Financial Instruments Assets [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Commodity contracts not subject to rate recovery, assets |  | 1 |
Commodity contracts subject to rate recovery, assets |  | 3 | 2
Total |  | 4 | 2
Southern California Gas Company [Member] | Derivative Financial Instruments Liabilities [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Commodity contracts not subject to rate recovery, liabilities |  | 0 | 0
Commodity contracts subject to rate recovery, liabilities |  | 1 | 1
Total |  | 1 | 1
Level 1 | Nuclear Decommisioning Trusts [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Nuclear decommissioning trusts - equity securities |  | 623 | 619
Nuclear decommissioning trusts - Debt securities issued by the U.S. Treasury and other U.S. government corporations and agencies |  | 62 | 47
Nuclear decommissioning trusts - Municipal bonds |  | 0 | 0
Nuclear decommissioning trusts - Other securities |  | 0 | 0
Nuclear decommissioning trusts - Total debt securities |  | 62 | 47
Total nuclear decommissioning trusts | [1] | 685 | 666
Level 1 | Derivative Financial Instruments Assets [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Interest rate and foreign exchange instruments |  | 0 | 0
Commodity contracts not subject to rate recovery, assets |  | 1 | 22
Commodity contracts subject to rate recovery, assets |  | 0 | 0
Total |  | 686 | 688
Level 1 | Derivative Financial Instruments Liabilities [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Interest rate and foreign exchange instruments |  | 0 | 0
Commodity contracts not subject to rate recovery, liabilities |  | 3 | 5
Commodity contracts subject to rate recovery, liabilities |  | 0 | 0
Total |  | 3 | 5
Level 1 | San Diego Gas and Electric Company [Member] | Nuclear Decommisioning Trusts [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Nuclear decommissioning trusts - equity securities |  | 623 | 619
Nuclear decommissioning trusts - Debt securities issued by the U.S. Treasury and other U.S. government corporations and agencies |  | 62 | 47
Nuclear decommissioning trusts - Municipal bonds |  | 0 | 0
Nuclear decommissioning trusts - Other securities |  | 0 | 0
Nuclear decommissioning trusts - Total debt securities |  | 62 | 47
Total nuclear decommissioning trusts | [1] | 685 | 666
Level 1 | San Diego Gas and Electric Company [Member] | Derivative Financial Instruments Assets [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Commodity contracts not subject to rate recovery, assets |  | 0 | 0
Commodity contracts subject to rate recovery, assets |  | 0 | 0
Total |  | 685 | 666
Level 1 | San Diego Gas and Electric Company [Member] | Derivative Financial Instruments Liabilities [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Interest rate instruments |  | 0 | 0
Commodity contracts not subject to rate recovery, liabilities |  | 1 | 1
Commodity contracts subject to rate recovery, liabilities |  | 0 | 0
Total |  | 1 | 1
Level 1 | Southern California Gas Company [Member] | Derivative Financial Instruments Assets [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Commodity contracts not subject to rate recovery, assets |  | 0 |
Commodity contracts subject to rate recovery, assets |  | 0 | 0
Total |  | 0 | 0
Level 1 | Southern California Gas Company [Member] | Derivative Financial Instruments Liabilities [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Commodity contracts not subject to rate recovery, liabilities |  | 1 | 1
Commodity contracts subject to rate recovery, liabilities |  | 0 | 0
Total |  | 1 | 1
Level 2 | Nuclear Decommisioning Trusts [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Nuclear decommissioning trusts - equity securities |  | 0 | 0
Nuclear decommissioning trusts - Debt securities issued by the U.S. Treasury and other U.S. government corporations and agencies |  | 43 | 44
Nuclear decommissioning trusts - Municipal bonds |  | 156 | 156
Nuclear decommissioning trusts - Other securities |  | 190 | 182
Nuclear decommissioning trusts - Total debt securities |  | 389 | 382
Total nuclear decommissioning trusts | [1] | 389 | 382
Level 2 | Derivative Financial Instruments Assets [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Interest rate and foreign exchange instruments |  | 8 | 5
Commodity contracts not subject to rate recovery, assets |  | 19 | 16
Commodity contracts subject to rate recovery, assets |  | 1 | 1
Total |  | 417 | 404
Level 2 | Derivative Financial Instruments Liabilities [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Interest rate and foreign exchange instruments |  | 181 | 171
Commodity contracts not subject to rate recovery, liabilities |  | 6 | 3
Commodity contracts subject to rate recovery, liabilities |  | 67 | 68
Total |  | 254 | 242
Level 2 | San Diego Gas and Electric Company [Member] | Nuclear Decommisioning Trusts [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Nuclear decommissioning trusts - equity securities |  | 0 | 0
Nuclear decommissioning trusts - Debt securities issued by the U.S. Treasury and other U.S. government corporations and agencies |  | 43 | 44
Nuclear decommissioning trusts - Municipal bonds |  | 156 | 156
Nuclear decommissioning trusts - Other securities |  | 190 | 182
Nuclear decommissioning trusts - Total debt securities |  | 389 | 382
Total nuclear decommissioning trusts | [1] | 389 | 382
Level 2 | San Diego Gas and Electric Company [Member] | Derivative Financial Instruments Assets [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Commodity contracts not subject to rate recovery, assets |  | 0 | 0
Commodity contracts subject to rate recovery, assets |  | 0 | 0
Total |  | 389 | 382
Level 2 | San Diego Gas and Electric Company [Member] | Derivative Financial Instruments Liabilities [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Interest rate instruments |  | 39 | 37
Commodity contracts not subject to rate recovery, liabilities |  | 0 | 0
Commodity contracts subject to rate recovery, liabilities |  | 66 | 67
Total |  | 105 | 104
Level 2 | Southern California Gas Company [Member] | Derivative Financial Instruments Assets [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Commodity contracts not subject to rate recovery, assets |  | 0 |
Commodity contracts subject to rate recovery, assets |  | 1 | 1
Total |  | 1 | 1
Level 2 | Southern California Gas Company [Member] | Derivative Financial Instruments Liabilities [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Commodity contracts not subject to rate recovery, liabilities |  | 0 | 0
Commodity contracts subject to rate recovery, liabilities |  | 1 | 1
Total |  | 1 | 1
Level 3 | Nuclear Decommisioning Trusts [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Nuclear decommissioning trusts - equity securities |  | 0 | 0
Nuclear decommissioning trusts - Debt securities issued by the U.S. Treasury and other U.S. government corporations and agencies |  | 0 | 0
Nuclear decommissioning trusts - Municipal bonds |  | 0 | 0
Nuclear decommissioning trusts - Other securities |  | 0 | 0
Nuclear decommissioning trusts - Total debt securities |  | 0 | 0
Total nuclear decommissioning trusts | [1] | 0 | 0
Level 3 | Derivative Financial Instruments Assets [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Interest rate and foreign exchange instruments |  | 0 | 0
Commodity contracts not subject to rate recovery, assets |  | 0 | 0
Commodity contracts subject to rate recovery, assets |  | 68 | 72
Total |  | 68 | 72
Level 3 | Derivative Financial Instruments Liabilities [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Interest rate and foreign exchange instruments |  | 0 | 0
Commodity contracts not subject to rate recovery, liabilities |  | 0 | 0
Commodity contracts subject to rate recovery, liabilities |  | 57 | 53
Total |  | 57 | 53
Level 3 | San Diego Gas and Electric Company [Member] | Nuclear Decommisioning Trusts [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Nuclear decommissioning trusts - equity securities |  | 0 | 0
Nuclear decommissioning trusts - Debt securities issued by the U.S. Treasury and other U.S. government corporations and agencies |  | 0 | 0
Nuclear decommissioning trusts - Municipal bonds |  | 0 | 0
Nuclear decommissioning trusts - Other securities |  | 0 | 0
Nuclear decommissioning trusts - Total debt securities |  | 0 | 0
Total nuclear decommissioning trusts | [1] | 0 | 0
Level 3 | San Diego Gas and Electric Company [Member] | Derivative Financial Instruments Assets [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Commodity contracts not subject to rate recovery, assets |  | 0 | 0
Commodity contracts subject to rate recovery, assets |  | 68 | 72
Total |  | 68 | 72
Level 3 | San Diego Gas and Electric Company [Member] | Derivative Financial Instruments Liabilities [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Interest rate instruments |  | 0 | 0
Commodity contracts not subject to rate recovery, liabilities |  | 0 | 0
Commodity contracts subject to rate recovery, liabilities |  | 57 | 53
Total |  | 57 | 53
Level 3 | Southern California Gas Company [Member] | Derivative Financial Instruments Assets [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Commodity contracts not subject to rate recovery, assets |  | 0 |
Commodity contracts subject to rate recovery, assets |  | 0 | 0
Total |  | 0 | 0
Level 3 | Southern California Gas Company [Member] | Derivative Financial Instruments Liabilities [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Commodity contracts not subject to rate recovery, liabilities |  | 0 | 0
Commodity contracts subject to rate recovery, liabilities |  | 0 | 0
Total |  | 0 | 0
Netting | Nuclear Decommisioning Trusts [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Nuclear decommissioning trusts - equity securities | [2] | 0 | 0
Nuclear decommissioning trusts - Debt securities issued by the U.S. Treasury and other U.S. government corporations and agencies | [2] | 0 | 0
Nuclear decommissioning trusts - Municipal bonds | [2] | 0 | 0
Nuclear decommissioning trusts - Other securities | [2] | 0 | 0
Nuclear decommissioning trusts - Total debt securities | [2] | 0 | 0
Total nuclear decommissioning trusts | [1],[2] | 0 | 0
Netting | Derivative Financial Instruments Assets [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Interest rate and foreign exchange instruments | [2] | 0 | 0
Commodity contracts not subject to rate recovery, assets | [2] | 20 | (4)
Commodity contracts subject to rate recovery, assets | [2] | 32 | 28
Total | [2] | 52 | 24
Netting | Derivative Financial Instruments Liabilities [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Interest rate and foreign exchange instruments | [2] | 0 | 0
Commodity contracts not subject to rate recovery, liabilities | [2] | (7) | (4)
Commodity contracts subject to rate recovery, liabilities | [2] | (55) | (54)
Total | [2] | (62) | (58)
Netting | San Diego Gas and Electric Company [Member] | Nuclear Decommisioning Trusts [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Nuclear decommissioning trusts - equity securities | [2] | 0 | 0
Nuclear decommissioning trusts - Debt securities issued by the U.S. Treasury and other U.S. government corporations and agencies | [2] | 0 | 0
Nuclear decommissioning trusts - Municipal bonds | [2] | 0 | 0
Nuclear decommissioning trusts - Other securities | [2] | 0 | 0
Nuclear decommissioning trusts - Total debt securities | [2] | 0 | 0
Total nuclear decommissioning trusts | [1],[2] | 0 | 0
Netting | San Diego Gas and Electric Company [Member] | Derivative Financial Instruments Assets [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Commodity contracts not subject to rate recovery, assets | [2] | 2 | 1
Commodity contracts subject to rate recovery, assets | [2] | 30 | 27
Total | [2] | 32 | 28
Netting | San Diego Gas and Electric Company [Member] | Derivative Financial Instruments Liabilities [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Interest rate instruments | [2] | 0 | 0
Commodity contracts not subject to rate recovery, liabilities | [2] | (1) | (1)
Commodity contracts subject to rate recovery, liabilities | [2] | (55) | (54)
Total | [2] | (56) | (55)
Netting | Southern California Gas Company [Member] | Derivative Financial Instruments Assets [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Commodity contracts not subject to rate recovery, assets | [2] | 1 |
Commodity contracts subject to rate recovery, assets | [2] | 2 | 1
Total | [2] | 3 | 1
Netting | Southern California Gas Company [Member] | Derivative Financial Instruments Liabilities [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Commodity contracts not subject to rate recovery, liabilities | [2] | (1) | (1)
Commodity contracts subject to rate recovery, liabilities | [2] | 0 | 0
Total | [2] | $ (1) | $ (1)
[1] | Excludes cash balances and cash equivalents.
[2] | Includes the effect of the contractual ability to settle contracts under master netting agreements and with cash collateral, as well as cash collateral not offset.

X
- Definition Fair value assets measured on a recurring basis commodity contracts not subject to rate recovery. + References No definition available. + Details
Name: | sre_FairValueAssetsMeasuredOnRecurringBasisCommodityContractsNotSubjectToRateRecovery
Namespace Prefix: | sre_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Fair value assets measured on a recurring basis commodity contracts subject to rate recovery. + References No definition available. + Details
Name: | sre_FairValueAssetsMeasuredOnRecurringBasisCommodityContractsSubjectToRateRecovery
Namespace Prefix: | sre_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Fair value assets measured on a recurring basis nuclear decommissioning trusts, total debt securities. + References No definition available. + Details
Name: | sre_FairValueAssetsMeasuredOnRecurringBasisNuclearDecommissioningTrustsTotalDebtSecurities
Namespace Prefix: | sre_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Fair value liabilities measured on a recurring basis, commodity contracts not subject to rate recovery. + References No definition available. + Details
Name: | sre_FairValueLiabilitiesMeasuredOnRecurringBasisCommodityContractsNotSubjectToRateRecovery
Namespace Prefix: | sre_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Fair value liabilities measured on a recurring basis, commodity contracts subject to rate recovery. + References No definition available. + Details
Name: | sre_FairValueLiabilitiesMeasuredOnRecurringBasisCommodityContractsSubjectToRateRecovery
Namespace Prefix: | sre_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Fair value assets measured on a recurring basis interest rate and foreign exchange instruments. + References No definition available. + Details
Name: | sre_InterestRateAndForeignExchangeContractAssetFairValueDisclosure
Namespace Prefix: | sre_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Fair value liabilities measured on a recurring basis interest rate and foreign exchange instruments. + References No definition available. + Details
Name: | sre_InterestRateAndForeignExchangeContractLiabilityFairValueDisclosure
Namespace Prefix: | sre_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition This element represents the aggregate of the assets reported on the balance sheet at period end measured at fair value on a recurring basis by the entity. This element is intended to be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. + References No definition available. + Details
Name: | us-gaap_AssetsFairValueDisclosureRecurring
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition The fair value of investments held in a trust fund to pay for the costs of decontaminating and decommissioning facilities, whether such amount is presented as a separate caption or as a parenthetical disclosure on the balance sheet. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6392692&loc=d3e7535-110849 + Details
Name: | us-gaap_DecommissioningTrustAssetsAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- 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_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The fair value as of the balance sheet date of firm holdings in corporate stocks (common and preferred), stock options, warrants and any other financial instrument which represents, or provides the ability to obtain, ownership rights in a corporation. Includes both pledged (to counterparties as collateral for financing transactions) and unpledged holdings. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 940 -SubTopic 320 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=35711157&loc=d3e42546-110969 + Details
Name: | us-gaap_FinancialInstrumentsOwnedCorporateEquitiesAtFairValue
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition The fair value as of the balance sheet date of firm holdings in other positions not elsewhere specified in the taxonomy. Includes both pledged (to counterparties as collateral for financing transactions) and unpledged holdings. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 940 -SubTopic 320 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=35711157&loc=d3e42546-110969 + Details
Name: | us-gaap_FinancialInstrumentsOwnedOtherAtFairValue
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition The fair value as of the balance sheet date of firm holdings in fixed income obligations issued by state and local governments and authorities. Includes both pledged (to counterparties as collateral for financing transactions) and unpledged holdings. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 940 -SubTopic 320 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=35711157&loc=d3e42546-110969 + Details
Name: | us-gaap_FinancialInstrumentsOwnedStateAndMunicipalGovernmentObligationsAtFairValue
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition The fair value as of the balance sheet date of firm holdings in debt obligations issued by the US government including short-term Treasury bills, medium-term Treasury notes, and long-term Treasury bonds, as well as debt issued by agencies. Includes both pledged (to counterparties as collateral for financing transactions) and unpledged holdings. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 940 -SubTopic 320 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=35711157&loc=d3e42546-110969 + Details
Name: | us-gaap_FinancialInstrumentsOwnedUSGovernmentAndAgencyObligationsAtFairValue
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Fair value as of the balance sheet date of all derivative liabilities designated as interest rate fair value hedging instruments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4B -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=56946850&loc=SL5624163-113959 + Details
Name: | us-gaap_InterestRateFairValueHedgeLiabilityAtFairValue
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Aggregation of the liabilities reported on the balance sheet measured at fair value on a recurring basis by the entity. + References No definition available. + Details
Name: | us-gaap_LiabilitiesFairValueDisclosureRecurring
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Details
Name: | us-gaap_FairValueByAssetClassAxis=sre_NucleardecommisioningtrustsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FairValueByAssetClassAxis=us-gaap_DerivativeFinancialInstrumentsAssetsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FairValueByAssetClassAxis=us-gaap_DerivativeFinancialInstrumentsLiabilitiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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

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

X
- Details
Name: | us-gaap_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueInputsLevel1Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueInputsLevel2Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueInputsLevel3Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueConcentrationOfCreditRiskMasterNettingArrangementsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |