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DEBT AND CREDIT FACILITIES - NARRATIVE (Details) |  |  |  |  | 1 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Sep. 24, 2018 USD ($) | May 17, 2018 USD ($) | May 15, 2018 USD ($) | Jan. 12, 2018 USD ($) | Dec. 31, 2018 USD ($) line_of_credit | Jan. 31, 2018 USD ($) | Dec. 31, 2018 USD ($) line_of_credit | Dec. 31, 2017 USD ($) | Dec. 13, 2018 USD ($) | Oct. 31, 2018 USD ($)
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Letters of credit outstanding |  |  |  |  | $ 598,000,000 |  | $ 598,000,000 |  |  |
Unsecured debt |  |  |  |  | 12,900,000,000 |  | 12,900,000,000 |  |  |
Callable long-term debt, not subject to make-whole provisions |  |  |  |  | 976,000,000 |  | 976,000,000 |  |  |
Repayments of debt |  |  |  | $ 800,000,000 |  | $ 800,000,000 |  |  |  |
Sempra Energy [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Total facility |  |  |  |  | 1,250,000,000 |  | 1,250,000,000 |  |  |
Available unused credit |  |  |  |  | 1,250,000,000 |  | 1,250,000,000 |  |  |
Sempra Energy [Member] | Fixed and Variable Rate Notes [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Gross long-term debt |  |  |  |  |  | 4,900,000,000 |  |  |  |
Unamortized debt discount (premium) and debt issuance costs |  |  |  |  |  | $ 68,000,000 |  |  |  |
Sempra U.S. Businesses [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Total facility |  |  |  |  | 5,435,000,000 |  | 5,435,000,000 |  |  |
Available unused credit |  |  |  |  | $ 4,219,000,000 |  | $ 4,219,000,000 |  |  |
Sempra Energy Consolidated [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Number of lines of credit | line_of_credit |  |  |  |  | 3 |  | 3 |  |  |
Weighted average interest rate on total short-term debt outstanding |  |  |  |  | 3.01% |  | 3.01% | 1.92% |  |
South American Utilities and Mexico Combined [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Total facility |  |  |  |  | $ 1,819,000,000 |  | $ 1,819,000,000 |  |  |
Available unused credit |  |  |  |  | 829,000,000 |  | 829,000,000 |  |  |
Line of credit |  |  |  |  | 990,000,000 |  | 990,000,000 |  |  |
Southern California Gas Company [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Total facility |  |  |  |  | 750,000,000 |  | 750,000,000 |  |  |
Available unused credit |  |  |  |  | $ 453,000,000 |  | $ 453,000,000 |  |  |
Weighted average interest rate on total short-term debt outstanding |  |  |  |  | 2.58% |  | 2.58% | 1.64% |  |
Unsecured debt |  |  |  |  | $ 9,000,000 |  | $ 9,000,000 |  |  |
Callable long-term debt, not subject to make-whole provisions |  |  |  |  | 4,000,000 |  | 4,000,000 |  |  |
First mortgage bonds available for future issuance |  |  |  |  | 1,200,000,000 |  | 1,200,000,000 |  |  |
Gross long-term debt |  |  |  |  | 3,450,000,000 |  | 3,450,000,000 | $ 3,000,000,000 |  |
Otay Mesa Energy Center [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Callable long-term debt, not subject to make-whole provisions |  |  |  |  | 220,000,000 |  | 220,000,000 |  |  |
OMEC LLC [Member] | Secured Debt [Member] | December 2018 OMEC Loan Agreement [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Debt amount |  |  |  |  | $ 220,000,000 |  | 220,000,000 |  |  |
OMEC LLC [Member] | Secured Debt [Member] | December 2018 OMEC Loan Agreement [Member] | LIBOR [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Variable percentage rate |  |  |  |  | 2.00% |  |  |  |  |
San Diego Gas and Electric Company [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Total facility |  |  |  |  | $ 750,000,000 |  | 750,000,000 |  |  |
Available unused credit |  |  |  |  | $ 453,000,000 |  | $ 453,000,000 |  |  |
Weighted average interest rate on total short-term debt outstanding |  |  |  |  | 2.97% |  | 2.97% | 1.65% |  |
Unsecured debt |  |  |  |  | $ 0 |  | $ 0 |  |  |
Callable long-term debt, not subject to make-whole provisions |  |  |  |  | 251,000,000 |  | 251,000,000 |  |  |
First mortgage bonds available for future issuance |  |  |  |  | 5,700,000,000 |  | 5,700,000,000 |  |  |
Gross long-term debt |  |  |  |  | 4,776,000,000 |  | 4,776,000,000 | $ 4,573,000,000 |  |
San Diego Gas and Electric Company [Member] | Four Point One Five Percent First Mortgage Bonds Maturing Twenty Forty Eight [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Proceeds from issuance of first mortgage bond |  | $ 400,000,000 |  |  |  |  |  |  |  |
Stated percentage rate |  | 4.15% |  |  |  |  |  |  |  |
Southern California Gas Company [Member] | Four Point One Two Five Percent First Mortgage Bonds Maturing Twenty Forty Eight [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Proceeds from issuance of first mortgage bond |  |  | $ 400,000,000 |  |  |  |  |  |  |
Stated percentage rate |  |  | 4.125% |  |  |  |  |  |  |
Southern California Gas Company [Member] | Four Point Three Percent First Mortgage Bonds Maturing Twenty Forty Nine [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Proceeds from issuance of first mortgage bond | $ 550,000,000 |  |  |  |  |  |  |  |  |
Stated percentage rate | 4.30% |  |  |  |  |  |  |  |  |
Sempra South American Utilities [Member] | Luz Del Sur [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Proceeds from issuance of debt |  |  |  |  |  |  | 107,000,000 |  |  |
Line of credit |  |  |  |  | $ 61,000,000 |  | $ 61,000,000 |  |  |
Sempra South American Utilities [Member] | Luz Del Sur [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Stated percentage rate |  |  |  |  | 4.30% |  | 4.30% |  |  |
Sempra South American Utilities [Member] | Luz Del Sur [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Stated percentage rate |  |  |  |  | 5.70% |  | 5.70% |  |  |
Sempra South American Utilities [Member] | Luz Del Sur [Member] | Corporate Debt Securities [Member] | Corporate Bonds Maturing 2028 [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Stated percentage rate |  |  |  |  |  |  |  |  |  | 7.00%
Debt amount |  |  |  |  |  |  |  |  |  | $ 50,000,000
Interest Rate Swap, maturing on April 30, 2019 [Member] | OMEC LLC [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Notional amount of derivative liability |  |  |  |  | $ 142,000,000 |  | $ 142,000,000 |  |  |
Fixed percentage interest rate |  |  |  |  | 5.2925% |  | 5.2925% |  |  |
Interest Rate Swap, maturing on October 31, 2019 [Member] | OMEC LLC [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Notional amount of derivative liability |  |  |  |  | $ 159,000,000 |  | $ 159,000,000 |  |  |
Fixed percentage interest rate |  |  |  |  | 2.765% |  | 2.765% |  |  |
Swaption [Member] | OMEC LLC [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Notional amount of derivative liability |  |  |  |  | $ 142,000,000 |  | $ 142,000,000 |  |  |
Fixed percentage interest rate |  |  |  |  | 3.0375% |  | 3.0375% |  |  |
Peaker Plant Facility [Member] | San Diego Gas and Electric Company [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Power purchase agreement term |  |  |  |  |  |  |  | 20 years |  |
Capital lease obligations incurred |  |  |  |  | $ 550,000,000 |  |  |  |  |
Certain Subsidiaries Of Sempra Renewables [Member] | Disposal Group Disposed of by Sale [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Proceeds from sale |  |  |  |  |  |  |  |  | $ 1,600,000,000 |
Long-term debt |  |  |  |  |  |  |  |  | $ 70,000,000 |

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- Definition Percentage points added to the reference rate to compute the variable rate on the debt instrument. + References No definition available. + Details
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- Definition Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=109500613&loc=SL6031897-161870 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(16)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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- Definition Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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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
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- Definition Amount of unamortized debt discount (premium) and debt issuance costs. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (b)(2) -URI http://asc.fasb.org/extlink&oid=109500613&loc=SL6031897-161870 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=114775744&loc=d3e28555-108399 + Details
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- Definition Nominal or face amount used to calculate payments on the derivative liability. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5579245-113959 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1B -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5580258-113959 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5579245-113959 + Details
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- Definition The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(16)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition The cash inflow during the period from additional borrowings in aggregate debt. Includes proceeds from short-term and long-term debt. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3255-108585 + Details
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- Definition The cash inflow from amounts received from a long-term debt instrument secured by a first mortgage deed of trust, containing a pledge of real property. The lender has the highest claim on the property in case of default. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3255-108585 + Details
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- Definition The cash outflow during the period from the repayment of aggregate short-term and long-term debt. Excludes payment of capital lease obligations. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3291-108585 + Details
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- Definition Weighted average interest rate of short-term debt outstanding calculated at point in time. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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