DEBT AND CREDIT FACILITIES - SCHEDULE OF LONG-TERM DEBT INSTRUMENTS (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2018	Dec. 31, 2017
Debt Instrument [Line Items]
Current portion of long-term debt	$ (1,673)	$ (1,427)
Long-term debt	21,611	16,445
San Diego Gas and Electric Company [Member]
Debt Instrument [Line Items]
Gross long-term debt	4,776	4,573
Capital lease obligations	1,272	732
Long-term debt and capital lease obligations	6,268	5,600
Current portion of long-term debt	(81)	(220)
Unamortized discount on long-term debt	(12)	(11)
Unamortized debt issuance costs	(37)	(34)
Long-term debt	6,138	5,335
San Diego Gas and Electric Company [Member] \| First Mortgage Bonds, Due July 2018 [Member]
Debt Instrument [Line Items]
Gross long-term debt	0	$ 161
Stated percentage rate		1.65%
San Diego Gas and Electric Company [Member] \| First Mortgage Bonds, Due August 2021 [Member]
Debt Instrument [Line Items]
Gross long-term debt	$ 350	$ 350
Stated percentage rate	3.00%
San Diego Gas and Electric Company [Member] \| First Mortgage Bonds Due February 2022 [Member]
Debt Instrument [Line Items]
Gross long-term debt	$ 125	161
Stated percentage rate	1.914%
San Diego Gas and Electric Company [Member] \| First Mortgage Bonds, Due September 2023 [Member]
Debt Instrument [Line Items]
Gross long-term debt	$ 450	450
Stated percentage rate	3.60%
San Diego Gas and Electric Company [Member] \| First Mortgage Bonds Due May 2026 [Member]
Debt Instrument [Line Items]
Gross long-term debt	$ 500	500
Stated percentage rate	2.50%
San Diego Gas and Electric Company [Member] \| First Mortgage Bonds, Due January and February 2034 [Member]
Debt Instrument [Line Items]
Gross long-term debt	$ 176	176
Stated percentage rate	5.875%
San Diego Gas and Electric Company [Member] \| First Mortgage Bonds, Due May 2035 [Member]
Debt Instrument [Line Items]
Gross long-term debt	$ 250	250
Stated percentage rate	5.35%
San Diego Gas and Electric Company [Member] \| First Mortgage Bonds, Due September 2037 [Member]
Debt Instrument [Line Items]
Gross long-term debt	$ 250	250
Stated percentage rate	6.125%
San Diego Gas and Electric Company [Member] \| First Mortgage Bonds, Due May 2039 [Member]
Debt Instrument [Line Items]
Gross long-term debt	$ 75	75
Stated percentage rate	4.00%
San Diego Gas and Electric Company [Member] \| First Mortgage Bonds, Due June 2039 [Member]
Debt Instrument [Line Items]
Gross long-term debt	$ 300	300
Stated percentage rate	6.00%
San Diego Gas and Electric Company [Member] \| First Mortgage Bonds, Due May 2040 [Member]
Debt Instrument [Line Items]
Gross long-term debt	$ 250	250
Stated percentage rate	5.35%
San Diego Gas and Electric Company [Member] \| First Mortgage Bonds, Due August 2040 [Member]
Debt Instrument [Line Items]
Gross long-term debt	$ 500	500
Stated percentage rate	4.50%
San Diego Gas and Electric Company [Member] \| First Mortgage Bonds, Due November 2041 [Member]
Debt Instrument [Line Items]
Gross long-term debt	$ 250	250
Stated percentage rate	3.95%
San Diego Gas and Electric Company [Member] \| First Mortgage Bonds, Due April 2042 [Member]
Debt Instrument [Line Items]
Gross long-term debt	$ 250	250
Stated percentage rate	4.30%
San Diego Gas and Electric Company [Member] \| First Mortgage Bonds, Due June 2047 [Member]
Debt Instrument [Line Items]
Gross long-term debt	$ 400	400
Stated percentage rate	3.75%
San Diego Gas and Electric Company [Member] \| First Mortgage Bonds, Due May 2048 [Member]
Debt Instrument [Line Items]
Gross long-term debt	$ 400	0
Stated percentage rate	4.15%
San Diego Gas and Electric Company [Member] \| Capital Lease Obligations, Purchased Power Agreements [Member]
Debt Instrument [Line Items]
Capital lease obligations	$ 1,270	731
San Diego Gas and Electric Company [Member] \| Capital Lease Obligations, Other [Member]
Debt Instrument [Line Items]
Capital lease obligations	2	1
San Diego Gas and Electric Company [Member] \| First Mortgage Bonds, Due June 2026 [Member]
Debt Instrument [Line Items]
Gross long-term debt	$ 250	250
Stated percentage rate	6.00%
San Diego Gas and Electric Company [Member] \| Other Long-term Debt [Member]
Debt Instrument [Line Items]
Long-term debt and capital lease obligations	$ 1,492	1,027
San Diego Gas and Electric Company [Member] \| Otay Mesa Energy Center Loan Payable Currently Through April 2019 [Member]
Debt Instrument [Line Items]
Stated percentage rate	5.2925%
Variable percentage rate	4.7896%
Southern California Gas Company [Member]
Debt Instrument [Line Items]
Gross long-term debt	$ 3,450	3,000
Capital lease obligations	3	1
Long-term debt and capital lease obligations	3,462	3,010
Current portion of long-term debt	(3)	(501)
Unamortized discount on long-term debt	(6)	(7)
Unamortized debt issuance costs	(26)	(17)
Long-term debt	3,427	2,485
Southern California Gas Company [Member] \| First Mortgage Bonds, Due April 2018 [Member]
Debt Instrument [Line Items]
Gross long-term debt	$ 0	250
Stated percentage rate	5.45%
Southern California Gas Company [Member] \| First Mortgage Bonds Due June 2018 [Member]
Debt Instrument [Line Items]
Gross long-term debt	$ 0	250
Stated percentage rate	1.55%
Southern California Gas Company [Member] \| First Mortgage Bonds, Due September 2024 [Member]
Debt Instrument [Line Items]
Gross long-term debt	$ 500	500
Stated percentage rate	3.15%
Southern California Gas Company [Member] \| First Mortgage Bonds Due June 2025 [Member]
Debt Instrument [Line Items]
Gross long-term debt	$ 350	350
Stated percentage rate	3.20%
Southern California Gas Company [Member] \| First Mortgage Bonds, Due June 2026 [Member]
Debt Instrument [Line Items]
Gross long-term debt	$ 500	500
Stated percentage rate	2.60%
Southern California Gas Company [Member] \| First Mortgage Bonds, Due November 2035 [Member]
Debt Instrument [Line Items]
Gross long-term debt	$ 250	250
Stated percentage rate	5.75%
Southern California Gas Company [Member] \| First Mortgage Bonds, Due November 2040 [Member]
Debt Instrument [Line Items]
Gross long-term debt	$ 300	300
Stated percentage rate	5.125%
Southern California Gas Company [Member] \| First Mortgage Bonds, Due September 2042 [Member]
Debt Instrument [Line Items]
Gross long-term debt	$ 350	350
Stated percentage rate	3.75%
Southern California Gas Company [Member] \| First Mortgage Bonds, Due March 2044 [Member]
Debt Instrument [Line Items]
Gross long-term debt	$ 250	250
Stated percentage rate	4.45%
Southern California Gas Company [Member] \| First Mortgage Bonds, Due June 2048 [Member]
Debt Instrument [Line Items]
Gross long-term debt	$ 400	0
Stated percentage rate	4.125%
Southern California Gas Company [Member] \| First Mortgage Bonds Due January 2049 [Member]
Debt Instrument [Line Items]
Gross long-term debt	$ 550	0
Stated percentage rate	4.30%
Southern California Gas Company [Member] \| Other Long-term Debt [Member]
Debt Instrument [Line Items]
Long-term debt and capital lease obligations	$ 12	10
Southern California Gas Company [Member] \| Other Long-term Debt, Due May 2026 [Member]
Debt Instrument [Line Items]
Gross long-term debt	$ 4	4
Stated percentage rate	1.875%
Southern California Gas Company [Member] \| Other Long-term Debt, Due January 2028 [Member]
Debt Instrument [Line Items]
Gross long-term debt	$ 5	5
Stated percentage rate	5.67%
Sempra Energy [Member]
Debt Instrument [Line Items]
Build to suit lease	$ 138	138
Sempra Energy [Member] \| Other Long-term Debt, Due June 2018 [Member]
Debt Instrument [Line Items]
Gross long-term debt	0	$ 500
Stated percentage rate		6.15%
Sempra Energy [Member] \| Other Long-term Debt, Due February 2019 [Member]
Debt Instrument [Line Items]
Gross long-term debt	$ 500	$ 500
Stated percentage rate	9.80%
Sempra Energy [Member] \| Other Long-term Debt, Due July 2019 [Member]
Debt Instrument [Line Items]
Gross long-term debt	$ 500	0
Stated percentage rate	2.69%
Sempra Energy [Member] \| Other Long-term Debt, Due October 2019 [Member]
Debt Instrument [Line Items]
Gross long-term debt	$ 500	500
Stated percentage rate	1.625%
Sempra Energy [Member] \| Other Long Term Debt Due February 2020 [Member]
Debt Instrument [Line Items]
Gross long-term debt	$ 500	0
Sempra Energy [Member] \| Other Long Term Debt Due March 2020 [Member]
Debt Instrument [Line Items]
Gross long-term debt	$ 500	500
Stated percentage rate	2.40%
Sempra Energy [Member] \| Other Long Term Debt, Due November 2020 [Member]
Debt Instrument [Line Items]
Gross long-term debt	$ 400	400
Stated percentage rate	2.85%
Sempra Energy [Member] \| Other Long-term Debt, Due January 2021 [Member]
Debt Instrument [Line Items]
Gross long-term debt	$ 700	0
Effective percentage rate	2.94%
Sempra Energy [Member] \| Other Long Term Debt, Due March 2021 [Member]
Debt Instrument [Line Items]
Gross long-term debt	$ 850	850
Effective percentage rate	3.24%
Sempra Energy [Member] \| Other Long-term Debt, Due October 2022 [Member]
Debt Instrument [Line Items]
Gross long-term debt	$ 500	500
Stated percentage rate	2.875%
Sempra Energy [Member] \| Other Long-term Debt, Due February 2023 [Member]
Debt Instrument [Line Items]
Gross long-term debt	$ 500	0
Stated percentage rate	2.90%
Sempra Energy [Member] \| Other Long-term Debt, Due December 2023 [Member]
Debt Instrument [Line Items]
Gross long-term debt	$ 500	500
Stated percentage rate	4.05%
Sempra Energy [Member] \| Other Long Term Debt Due June 2024 [Member]
Debt Instrument [Line Items]
Gross long-term debt	$ 500	500
Stated percentage rate	3.55%
Sempra Energy [Member] \| Other Long-term Debt, Due November 2025 [Member]
Debt Instrument [Line Items]
Gross long-term debt	$ 350	350
Stated percentage rate	3.75%
Sempra Energy [Member] \| Other Long Term Debt Due June 2027 [Member]
Debt Instrument [Line Items]
Gross long-term debt	$ 750	750
Stated percentage rate	3.25%
Sempra Energy [Member] \| Other Long Term Debt Due February 2028 [Member]
Debt Instrument [Line Items]
Gross long-term debt	$ 1,000	0
Sempra Energy [Member] \| Other Long Term Debt Due February 2038 [Member]
Debt Instrument [Line Items]
Gross long-term debt	1,000	0
Sempra Energy [Member] \| Other Long-Term Debt, Due October 2039 [Member]
Debt Instrument [Line Items]
Gross long-term debt	$ 750	750
Stated percentage rate	6.00%
Sempra Energy [Member] \| Other Long Term Debt Due February 2048 [Member]
Debt Instrument [Line Items]
Gross long-term debt	$ 800	0
Stated percentage rate	4.00%
Sempra Energy [Member] \| Market Value Adjustment For Interest Rate Swap [Member]
Debt Instrument [Line Items]
Gross long-term debt	$ 0	(1)
Sempra Energy [Member] \| Two Point Four Percent Notes Due Twenty Twenty [Member]
Debt Instrument [Line Items]
Stated percentage rate	2.40%
Sempra Energy [Member] \| Two Point Nine Percent Notes Due Twenty Twenty Three [Member]
Debt Instrument [Line Items]
Stated percentage rate	2.90%
Sempra Energy [Member] \| Three Point Four Percent Notes Due Twenty Twenty Eight [Member]
Debt Instrument [Line Items]
Stated percentage rate	3.40%
Sempra Energy [Member] \| Three Point Eight Percent Notes Due Twenty Twenty Eight [Member]
Debt Instrument [Line Items]
Stated percentage rate	3.80%
Sempra Energy [Member] \| Four Percent Notes Due Twenty Forty Eight [Member]
Debt Instrument [Line Items]
Stated percentage rate	4.00%
Sempra South American Utilities [Member]
Debt Instrument [Line Items]
Capital lease obligations	$ 6	6
Sempra South American Utilities [Member] \| Other Long-term Debt, Currently Through October 2030 [Member]
Debt Instrument [Line Items]
Gross long-term debt	$ 186	205
Stated percentage rate	4.25%
Sempra South American Utilities [Member] \| Other Long-term Debt, Currently Through December 2018 [Member]
Debt Instrument [Line Items]
Gross long-term debt	$ 105	53
Sempra South American Utilities [Member] \| Other Long-term Debt, Currently Through December 2018 [Member] \| Minimum [Member]
Debt Instrument [Line Items]
Stated percentage rate	4.30%
Sempra South American Utilities [Member] \| Other Long-term Debt, Currently Through December 2018 [Member] \| Maximum [Member]
Debt Instrument [Line Items]
Stated percentage rate	5.70%
Sempra South American Utilities [Member] \| Other Long Term Debt, Payable Currently Through September 2029 [Member]
Debt Instrument [Line Items]
Gross long-term debt	$ 432	415
Sempra South American Utilities [Member] \| Other Long Term Debt, Payable Currently Through September 2029 [Member] \| Minimum [Member]
Debt Instrument [Line Items]
Stated percentage rate	4.75%
Sempra South American Utilities [Member] \| Other Long Term Debt, Payable Currently Through September 2029 [Member] \| Maximum [Member]
Debt Instrument [Line Items]
Stated percentage rate	8.75%
Sempra South American Utilities [Member] \| Other Long Term Debt, Payable Currently Through May 2022 [Member]
Debt Instrument [Line Items]
Gross long-term debt	$ 4	6
Sempra South American Utilities [Member] \| Other Long Term Debt, Payable Currently Through May 2022 [Member] \| Minimum [Member]
Debt Instrument [Line Items]
Stated percentage rate	3.77%
Sempra South American Utilities [Member] \| Other Long Term Debt, Payable Currently Through May 2022 [Member] \| Maximum [Member]
Debt Instrument [Line Items]
Stated percentage rate	4.61%
Sempra Mexico [Member] \| Other Long-term Debt, Due February 2023 [Member]
Debt Instrument [Line Items]
Gross long-term debt	$ 198	198
Stated percentage rate	6.30%
Effective percentage rate	4.12%
Sempra Mexico [Member] \| Other Long-term Debt, Due February 2018 [Member]
Debt Instrument [Line Items]
Gross long-term debt	$ 0	66
Variable percentage rate	2.66%
Sempra Mexico [Member] \| Other Long-term Debt, Currently Through December 2026 [Member]
Debt Instrument [Line Items]
Gross long-term debt	$ 275	314
Stated percentage rate	4.88%
Sempra Mexico [Member] \| Other Long-term Debt, Currently Through January 2028 [Member]
Debt Instrument [Line Items]
Gross long-term debt	$ 300	300
Stated percentage rate	3.75%
Sempra Mexico [Member] \| Other Long Term Debt, Payable Currently Through March 2032 [Member]
Debt Instrument [Line Items]
Gross long-term debt	$ 447	468
Stated percentage rate	6.67%
Long-term debt subject to fixed rate	$ 246
Sempra Mexico [Member] \| Other Long Term Debt, Payable Currently Through March 2032, Variable Rate Two [Member]
Debt Instrument [Line Items]
Effective percentage rate	5.82%
Long-term debt subject to variable rate	$ 37
Sempra Mexico [Member] \| Other Long Term Debt, Payable Currently Through May 2032, Variable Rate One [Member]
Debt Instrument [Line Items]
Weighted average rate	6.33%
Long-term debt subject to variable rate	$ 164
Sempra Mexico [Member] \| Other Long-term Debt, Currently Through January 2048 [Member]
Debt Instrument [Line Items]
Gross long-term debt	$ 540	540
Stated percentage rate	4.875%
Sempra Mexico [Member] \| Other Long-term Debt, Currently Through July 2028 [Member]
Debt Instrument [Line Items]
Gross long-term debt	$ 4	0
Variable percentage rate	6.07%
Sempra Renewables [Member] \| Other LongTerm Debt, Variable Rate Loan Payable Currently Through December 2028 [Member]
Debt Instrument [Line Items]
Gross long-term debt	$ 0	$ 77
Stated percentage rate		3.668%
Variable percentage rate		3.325%
Long-term debt subject to fixed rate		$ 59
Sempra LNG & Midstream [Member] \| Other Long-term Debt, Currently Through October 2026 [Member]
Debt Instrument [Line Items]
Gross long-term debt	$ 21	20
Sempra LNG & Midstream [Member] \| Other Long-term Debt, Currently Through October 2026 [Member] \| Minimum [Member]
Debt Instrument [Line Items]
Stated percentage rate	2.87%
Sempra LNG & Midstream [Member] \| Other Long-term Debt, Currently Through October 2026 [Member] \| Maximum [Member]
Debt Instrument [Line Items]
Stated percentage rate	3.51%
Other Sempra Energy [Member]
Debt Instrument [Line Items]
Long-term debt and capital lease obligations	$ 13,756	9,405
Current portion of long-term debt	(1,589)	(706)
Unamortized discount on long-term debt	(38)	(13)
Unamortized premium on long-term debt	4	4
Unamortized debt issuance costs	(87)	(65)
Long-term debt	12,046	8,625
Otay Mesa VIE [Member]
Debt Instrument [Line Items]
Current portion of long-term debt	(28)	(10)
Otay Mesa VIE [Member] \| San Diego Gas and Electric Company [Member]
Debt Instrument [Line Items]
Current portion of long-term debt	(28)	(10)
Long-term debt	190	284
Otay Mesa VIE [Member] \| San Diego Gas and Electric Company [Member] \| Otay Mesa Energy Center Loan Payable Currently Through April 2019 [Member]
Debt Instrument [Line Items]
Gross long-term debt	0	295
Otay Mesa VIE [Member] \| San Diego Gas and Electric Company [Member] \| Otay Mesa Energy Center Loan Payable 2019 through 2024 [Member]
Debt Instrument [Line Items]
Gross long-term debt	220	$ 0
Notional amount of derivative liability	$ 142
Fixed percentage interest rate	5.2925%

Build-to-suit lease.

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- Definition

Long term debt and capital lease obligations, including current portion.

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No definition available.

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- Definition

Amount equal to the present value (the principal) at the beginning of the lease term of minimum lease payments during the lease term (excluding that portion of the payments representing executory costs such as insurance, maintenance, and taxes to be paid by the lessor, together with any profit thereon) net of payments or other amounts applied to the principal through the balance sheet date.

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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

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- Definition

Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium.

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- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

+ References

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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.

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- Definition

Amount, after accumulated amortization, of debt discount.

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- Definition

Amount, after accumulated amortization, of debt premium.

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- Definition

Weighted average interest rate of debt outstanding.

+ References

No definition available.

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- Definition

Fixed interest rate related to the interest rate derivative.

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No definition available.

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- Definition

Nominal or face amount used to calculate payments on the derivative liability.

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-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

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