v3.8.0.1

GENERAL INFORMATION AND OTHER FINANCIAL DATA - SHAREHOLDER'S EQUITY AND NONCONTROLLING INTEREST (Details) - USD ($) |  |  |  | 1 Months Ended | 3 Months Ended |
--- | --- | --- | --- | --- | --- | ---
May 07, 2018 | Mar. 08, 2018 | Jan. 09, 2018 | Jan. 31, 2018 | Mar. 31, 2018 | Mar. 31, 2017 | Jan. 01, 2018
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |
Equity, beginning of period |  |  |  |  | $ 15,140,000,000 | [1] | $ 15,140,000,000 | [1] | $ 15,241,000,000 |  |
Equity, beginning of period | [1] |  |  |  | 12,670,000,000 |  | 12,670,000,000 |  |  |  |
Cumulative-effect adjustment from change in accounting principle |  |  |  |  |  |  |  |  |  |  | $ (1,000,000)
Comprehensive income (loss) |  |  |  |  |  |  | 457,000,000 |  | 515,000,000 |  |
Share-based compensation expense |  |  |  |  |  |  | 15,000,000 |  | 10,000,000 |  |
Mandatory convertible preferred stock dividends declared |  |  |  |  |  |  | (28,000,000) |  |  |  |
Common stock dividends declared |  |  |  |  |  |  | (236,000,000) |  | (206,000,000) |  |
Issuances of mandatory convertible preferred stock |  |  |  |  |  |  | 1,693,000,000 |  |  |  |
Issuances of common stock |  |  |  |  |  |  | 1,291,000,000 |  | 30,000,000 |  |
Repurchases of common stock |  |  |  |  |  |  | (19,000,000) |  | (14,000,000) |  |
Distributions to noncontrolling interests |  |  |  |  |  |  | (7,000,000) |  | (7,000,000) |  |
Equity, end of period |  |  |  |  |  |  | 18,305,000,000 |  | 15,569,000,000 |  |
Equity, end of period |  |  |  |  |  |  | 15,844,000,000 |  |  |  |
Proceeds from issuance |  |  |  |  |  |  | 1,693,000,000 |  | 0 | [2] |
Proceeds from issuance |  |  |  |  |  |  | 1,278,000,000 |  | 17,000,000 | [2] |
Parent [Member] |  |  |  |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |
Equity, beginning of period |  |  |  |  | 12,670,000,000 |  | 12,670,000,000 |  | 12,951,000,000 |  |
Cumulative-effect adjustment from change in accounting principle |  |  |  |  |  |  |  |  |  |  | (1,000,000)
Comprehensive income (loss) |  |  |  |  |  |  | 459,000,000 |  | 493,000,000 |  |
Share-based compensation expense |  |  |  |  |  |  | 15,000,000 |  | 10,000,000 |  |
Mandatory convertible preferred stock dividends declared |  |  |  |  |  |  | (28,000,000) |  |  |  |
Common stock dividends declared |  |  |  |  |  |  | (236,000,000) |  | (206,000,000) |  |
Issuances of mandatory convertible preferred stock |  |  |  |  |  |  | 1,693,000,000 |  |  |  |
Issuances of common stock |  |  |  |  |  |  | 1,291,000,000 |  | 30,000,000 |  |
Repurchases of common stock |  |  |  |  |  |  | (19,000,000) |  | (14,000,000) |  |
Distributions to noncontrolling interests |  |  |  |  |  |  | 0 |  | 0 |  |
Equity, end of period |  |  |  |  |  |  | 15,844,000,000 |  | 13,264,000,000 |  |
Noncontrolling Interest [Member] |  |  |  |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |
Equity, beginning of period |  |  |  |  | 2,470,000,000 |  | 2,470,000,000 |  | 2,290,000,000 |  |
Cumulative-effect adjustment from change in accounting principle |  |  |  |  |  |  |  |  |  |  | $ 0
Comprehensive income (loss) |  |  |  |  |  |  | (2,000,000) |  | 22,000,000 |  |
Share-based compensation expense |  |  |  |  |  |  | 0 |  | 0 |  |
Mandatory convertible preferred stock dividends declared |  |  |  |  |  |  | 0 |  |  |  |
Common stock dividends declared |  |  |  |  |  |  | 0 |  | 0 |  |
Issuances of mandatory convertible preferred stock |  |  |  |  |  |  | 0 |  |  |  |
Issuances of common stock |  |  |  |  |  |  | 0 |  | 0 |  |
Repurchases of common stock |  |  |  |  |  |  | 0 |  | 0 |  |
Distributions to noncontrolling interests |  |  |  |  |  |  | (7,000,000) |  | (7,000,000) |  |
Equity, end of period |  |  |  |  |  |  | 2,461,000,000 |  | 2,305,000,000 |  |
Common Stock [Member] |  |  |  |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |
Shares issued |  |  | 8,556,630 | 26,869,158 |  |  |  |  |  |  |
Over-Allotment Option [Member] | Common Stock [Member] |  |  |  |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |
Shares issued |  |  |  | 3,504,672 |  |  |  |  |  |  |
Underwriting discount |  |  |  | $ 8,000,000 |  |  |  |  |  |  |
Proceeds from issuance |  |  |  | $ 367,000,000 |  |  |  |  |  |  |
Public Offering [Member] | Common Stock [Member] |  |  |  |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |
Shares issued |  |  |  | 23,364,486 |  |  |  |  |  |  |
Shares issued (in usd per share) |  |  |  | $ 107.00 |  |  |  |  |  |  |
Shares issued net of underwriting discount (in usd per share) |  |  |  | $ 105.074 |  |  |  |  |  |  |
Settlement of Forward Sale Contracts [Member] | Common Stock [Member] |  |  |  |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |
Underwriting discount |  |  | $ 16,000,000 |  |  |  |  |  |  |  |
Proceeds from issuance |  |  | $ 900,000,000 |  |  |  |  |  |  |  |
Forward sales price (in usd per share) |  |  | $ 105.1816 |  |  |  |  |  |  |  |
Sempra Energy [Member] | Convertible Preferred Stock [Member] |  |  |  |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |
Shares issued |  |  |  | 17,250,000 |  |  |  |  |  |  |
Conversion price (in usd per share) |  |  |  | $ 100.00 |  |  |  |  |  |  |
Conversion price net of underwriting discount (in usd per share) |  |  |  | 98.20 |  |  |  |  |  |  |
Liquidation price (in usd per share) |  |  |  | $ 100.00 |  |  |  |  |  |  |
Proceeds from issuance |  |  |  |  | 1,690,000,000 |  |  |  |  |  |
Underwriting discount |  |  |  | $ 32,000,000 |  |  |  |  |  |  |
Sempra Energy [Member] | Over-Allotment Option [Member] | Convertible Preferred Stock [Member] |  |  |  |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |
Shares issued |  |  |  | 2,250,000 |  |  |  |  |  |  |
San Diego Gas and Electric Company [Member] |  |  |  |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |
Equity, beginning of period |  |  |  |  | 5,626,000,000 | [1] | 5,626,000,000 | [1] | 5,678,000,000 |  |
Equity, beginning of period | [1] |  |  |  | 5,598,000,000 |  | 5,598,000,000 |  |  |  |
Comprehensive income (loss) |  |  |  |  |  |  | 173,000,000 |  | 160,000,000 |  |
Common stock dividends declared |  |  |  |  |  |  |  |  | (175,000,000) |  |
Distributions to noncontrolling interests |  |  |  |  |  |  | (1,000,000) |  | (3,000,000) |  |
Equity, end of period |  |  |  |  |  |  | 5,798,000,000 |  | 5,660,000,000 |  |
Equity, end of period |  |  |  |  |  |  | 5,768,000,000 |  |  |  |
San Diego Gas and Electric Company [Member] | Parent [Member] |  |  |  |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |
Equity, beginning of period |  |  |  |  | 5,598,000,000 |  | 5,598,000,000 |  | 5,641,000,000 |  |
Comprehensive income (loss) |  |  |  |  |  |  | 170,000,000 |  | 155,000,000 |  |
Common stock dividends declared |  |  |  |  |  |  |  |  | (175,000,000) |  |
Distributions to noncontrolling interests |  |  |  |  |  |  | 0 |  | 0 |  |
Equity, end of period |  |  |  |  |  |  | 5,768,000,000 |  | 5,621,000,000 |  |
San Diego Gas and Electric Company [Member] | Noncontrolling Interest [Member] |  |  |  |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |
Equity, beginning of period |  |  |  |  | 28,000,000 |  | 28,000,000 |  | 37,000,000 |  |
Comprehensive income (loss) |  |  |  |  |  |  | 3,000,000 |  | 5,000,000 |  |
Common stock dividends declared |  |  |  |  |  |  |  |  | 0 |  |
Distributions to noncontrolling interests |  |  |  |  |  |  | (1,000,000) |  | (3,000,000) |  |
Equity, end of period |  |  |  |  |  |  | 30,000,000 |  | 39,000,000 |  |
Southern California Gas Company [Member] |  |  |  |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |
Equity, beginning of period |  |  |  |  | $ 3,907,000,000 | [1] | 3,907,000,000 | [1] | 3,510,000,000 |  |
Comprehensive income (loss) |  |  |  |  |  |  | 225,000,000 |  | 203,000,000 |  |
Equity, end of period |  |  |  |  |  |  | $ 4,132,000,000 |  | $ 3,713,000,000 |  |
Subsequent Event [Member] | Settlement of Forward Sale Contracts [Member] | Common Stock [Member] |  |  |  |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |
Shares issuable under forward contracts |  | 14,807,856 |  |  |  |  |  |  |  |  |
[1] | Derived from audited financial statements.
[2] | As adjusted for the retrospective adoption of ASU 2016-18, which we discuss in Note 2.

X
- Definition Debt Instrument, Convertible, Conversion Price, Net of Underwriting Discount + References No definition available. + Details
Name: | sre_DebtInstrumentConvertibleConversionPriceNetofUnderwritingDiscount
Namespace Prefix: | sre_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | instant

X
- Definition Preferred Stock Issued During Period, Value + References No definition available. + Details
Name: | sre_PreferredStockIssuedDuringPeriodValue
Namespace Prefix: | sre_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Shares Issued, Price Per Share, Net of Underwriting Discount + References No definition available. + Details
Name: | sre_SharesIssuedPricePerShareNetofUnderwritingDiscount
Namespace Prefix: | sre_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | instant

X
- Definition Total comprehensive income before preferred stock dividend requirements. + References No definition available. + Details
Name: | sre_TotalComprehensiveIncomeBeforePreferredStockDividendRequirements
Namespace Prefix: | sre_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amount of increase to additional paid-in capital (APIC) from recognition of equity-based compensation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 35 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=79507207&loc=d3e4534-113899 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5047-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 20 -Section 55 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=96864182&loc=d3e11149-113907 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 20 -Section 55 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=96864182&loc=d3e11178-113907 + Details
Name: | us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amount after tax of increase (decrease) to equity or (increase) decrease to net assets, resulting from the cumulative effect adjustment of a new accounting principle applied in the period of adoption. + References No definition available. + Details
Name: | us-gaap_CumulativeEffectOfNewAccountingPrincipleInPeriodOfAdoption
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The price per share of the conversion feature embedded in the debt instrument. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 5 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6928298&loc=SL6031898-161870 + Details
Name: | us-gaap_DebtInstrumentConvertibleConversionPrice1
Namespace Prefix: | us-gaap_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | instant

X
- Definition Amount of paid and unpaid common stock dividends declared with the form of settlement in cash, stock and payment-in-kind (PIK). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 405 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6957935&loc=d3e64057-112817 + Details
Name: | us-gaap_DividendsCommonStock
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount of paid and unpaid preferred stock dividends declared with the form of settlement in cash, stock and payment-in-kind (PIK). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 405 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6957935&loc=d3e64057-112817 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 + Details
Name: | us-gaap_DividendsPreferredStock
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The per share price of the Company's stock at which the contract holder of the freestanding contract has the right to purchase or sell the Company's stock at a future date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 40 -Section 50 -Paragraph 5 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=6445032&loc=d3e90205-114008 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 480 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(1) -URI http://asc.fasb.org/extlink&oid=6940734&loc=d3e22047-110879 + Details
Name: | us-gaap_ForwardContractIndexedToIssuersEquityForwardRate
Namespace Prefix: | us-gaap_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | duration

X
- Definition The maximum number of shares that could be issued to net share settle a contract, if applicable. If a contract does not have a fixed or determinable maximum number of shares that may be required to be issued, disclose the fact that a potentially infinite number of shares could be issued to settle the contract. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 40 -Section 50 -Paragraph 5 -Subparagraph (b)(2) -URI http://asc.fasb.org/extlink&oid=6445032&loc=d3e90205-114008 + Details
Name: | us-gaap_ForwardContractIndexedToIssuersEquityShares
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. + References No definition available. + Details
Name: | us-gaap_IncreaseDecreaseInStockholdersEquityRollForward
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Decrease in noncontrolling interest balance from payment of dividends or other distributions by the non-wholly owned subsidiary or partially owned entity, included in the consolidation of the parent entity, to the noncontrolling interest holders. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 + Details
Name: | us-gaap_MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Cash paid for expenses incurred during underwriting activities (the process to review insurance applications, evaluate risks, accept or reject applications, and determine the premiums to be charged) for insurance companies. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 25 -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3536-108585 + Details
Name: | us-gaap_PaymentsForUnderwritingExpense
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The per share liquidation preference (or restrictions) of nonredeemable preferred stock (or preferred stock redeemable solely at the option of the issuer) that has a preference in involuntary liquidation considerably in excess of the par or stated value of the shares. The liquidation preference is the difference between the preference in liquidation and the par or stated values of the share. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=84159872&loc=d3e21475-112644 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=84159872&loc=d3e21484-112644 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(28)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08(d)(1)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(d)(1)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
Name: | us-gaap_PreferredStockLiquidationPreference
Namespace Prefix: | us-gaap_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | instant

X
- Definition The cash inflow from the additional capital contribution to the entity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3255-108585 + Details
Name: | us-gaap_ProceedsFromIssuanceOfCommonStock
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The cash inflow from issuance of preferred stocks identified as being convertible into another form of financial instrument, typically the entity's common stock. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3255-108585 + Details
Name: | us-gaap_ProceedsFromIssuanceOfConvertiblePreferredStock
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Per share or per unit amount of equity securities issued. + References No definition available. + Details
Name: | us-gaap_SharesIssuedPricePerShare
Namespace Prefix: | us-gaap_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | instant

X
- Definition Number of new stock issued during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(29)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=84159872&loc=d3e21463-112644 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(28)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 + Details
Name: | us-gaap_StockIssuedDuringPeriodSharesNewIssues
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Definition Equity impact of the value of new stock issued during the period. Includes shares issued in an initial public offering or a secondary public offering. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(28)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=84159872&loc=d3e21463-112644 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(29)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
Name: | us-gaap_StockIssuedDuringPeriodValueNewIssues
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Equity impact of the value of stock that has been repurchased during the period and has not been retired and is not held in treasury. Some state laws may mandate the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(29)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=84159872&loc=d3e21463-112644 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(28)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
Name: | us-gaap_StockRepurchasedDuringPeriodValue
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which are attributable to the parent. The amount of the economic entity's stockholders' equity attributable to the parent excludes the amount of stockholders' equity which is allocable to that ownership interest in subsidiary equity which is not attributable to the parent (noncontrolling interest, minority interest). This excludes temporary equity and is sometimes called permanent equity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(30)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB Topic 4.E) -URI http://asc.fasb.org/extlink&oid=27010918&loc=d3e74512-122707 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(31)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(29)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
Name: | us-gaap_StockholdersEquity
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of stockholders' equity (deficit), net of receivables from officers, directors, owners, and affiliates of the entity, attributable to both the parent and noncontrolling interests. Amount excludes temporary equity. Alternate caption for the concept is permanent equity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 55 -Paragraph 4I -URI http://asc.fasb.org/extlink&oid=84234705&loc=SL4590271-111686 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 45 -Paragraph 16 -URI http://asc.fasb.org/extlink&oid=96868048&loc=SL4568740-111683 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 45 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=96868048&loc=SL4568447-111683 + Details
Name: | us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Details
Name: | us-gaap_StatementEquityComponentsAxis=us-gaap_ParentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementEquityComponentsAxis=us-gaap_NoncontrollingInterestMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementClassOfStockAxis=us-gaap_CommonStockMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_SubsidiarySaleOfStockAxis=us-gaap_OverAllotmentOptionMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_SubsidiarySaleOfStockAxis=sre_PublicOfferingMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_SubsidiarySaleOfStockAxis=sre_SettlementofForwardSaleContractsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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

X
- Details
Name: | us-gaap_StatementClassOfStockAxis=us-gaap_ConvertiblePreferredStockMember
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_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |