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DEBT AND CREDIT FACILITIES - SCHEDULE OF LONG-TERM DEBT INSTRUMENTS (Details) - USD ($)
$ in Millions
Oct. 13, 2017
Dec. 31, 2017
Oct. 30, 2017
Jun. 30, 2017
Dec. 31, 2016
Debt Instrument [Line Items]          
Current portion of long-term debt   $ (1,427)     $ (913) [1]
Long-term debt   16,445     14,429 [1]
San Diego Gas and Electric Company [Member]          
Debt Instrument [Line Items]          
Gross long-term debt   4,573     4,349
Capital lease obligations   732     240
Long-term debt and capital lease obligations   5,600     4,894
Current portion of long-term debt   (220)     (191) [1]
Unamortized discount on long-term debt   (11)     (11)
Unamortized debt issuance costs   (34)     (34)
Long-term debt   5,335     4,658 [1]
San Diego Gas and Electric Company [Member] | First Mortgage Bonds Due March 2017 [Member]          
Debt Instrument [Line Items]          
Gross long-term debt   0     $ 140
Stated percentage rate         1.151%
San Diego Gas and Electric Company [Member] | First Mortgage Bonds, Due July 2018 [Member]          
Debt Instrument [Line Items]          
Gross long-term debt   $ 161     $ 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   $ 161     197
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 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] | 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 0
Stated percentage rate   3.75%   3.75%  
San Diego Gas and Electric Company [Member] | Capital Lease Obligations, Purchased Power Agreements [Member]          
Debt Instrument [Line Items]          
Capital lease obligations   $ 731     239
San Diego Gas and Electric Company [Member] | Capital Lease Obligations, Other [Member]          
Debt Instrument [Line Items]          
Capital lease obligations   1     1
San Diego Gas and Electric Company [Member] | Other Long-term Debt [Member]          
Debt Instrument [Line Items]          
Long-term debt and capital lease obligations   $ 1,027     545
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%      
Southern California Gas Company [Member]          
Debt Instrument [Line Items]          
Gross long-term debt   $ 3,000     3,000
Capital lease obligations   1     0
Long-term debt and capital lease obligations   3,010     3,009
Current portion of long-term debt   (501)     0 [1]
Unamortized discount on long-term debt   (7)     (7)
Unamortized debt issuance costs   (17)     (20)
Long-term debt   2,485     2,982 [1]
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 April 2018 [Member]          
Debt Instrument [Line Items]          
Gross long-term debt   $ 250     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   $ 250     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 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] | Other Long-term Debt [Member]          
Debt Instrument [Line Items]          
Long-term debt and capital lease obligations   $ 10     9
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     137
Sempra Energy [Member] | Other Long Term Debt Due April 2017 [Member]          
Debt Instrument [Line Items]          
Gross long-term debt   $ 0     600
Stated percentage rate   2.30%      
Sempra Energy [Member] | Other Long-term Debt, Due June 2018 [Member]          
Debt Instrument [Line Items]          
Gross long-term debt   $ 500     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 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 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, Variable Rate Notes Due March 2021 [Member]          
Debt Instrument [Line Items]          
Gross long-term debt   $ 850 $ 850   0
Effective percentage rate   2.038%      
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 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     0
Stated percentage rate   3.25%      
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] | Market Value Adjustment For Interest Rate Swap [Member]          
Debt Instrument [Line Items]          
Gross long-term debt   $ (1)     (3)
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   $ 205     185
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   $ 53     75
Sempra South American Utilities [Member] | Other Long-term Debt, Currently Through December 2018 [Member] | Minimum [Member]          
Debt Instrument [Line Items]          
Stated percentage rate   5.18%      
Sempra South American Utilities [Member] | Other Long-term Debt, Currently Through December 2018 [Member] | Maximum [Member]          
Debt Instrument [Line Items]          
Stated percentage rate   6.70%      
Sempra South American Utilities [Member] | Other Long Term Debt, Payable Currently Through September 2029 [Member]          
Debt Instrument [Line Items]          
Gross long-term debt   $ 415     346
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   $ 6     7
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 2018 [Member]          
Debt Instrument [Line Items]          
Gross long-term debt   $ 66     63
Variable percentage rate   2.66%      
Sempra Mexico [Member] | Other Long Term Debt, Due February 2023 [Member]          
Debt Instrument [Line Items]          
Gross long-term debt   $ 198     189
Stated percentage rate   6.30%      
Effective percentage rate   4.12%      
Sempra Mexico [Member] | Other Long-term Debt, Currently Through December 2026 [Member]          
Debt Instrument [Line Items]          
Gross long-term debt   $ 314     352
Stated percentage rate   4.63%      
Sempra Mexico [Member] | Other Long-term Debt, Currently Through January 2028 [Member]          
Debt Instrument [Line Items]          
Gross long-term debt   $ 300     0
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   $ 468     481
Stated percentage rate   6.67%      
Long-term debt subject to fixed rate   $ 251      
Sempra Mexico [Member] | Other Long Term Debt, Payable Currently Through March 2032, Variable Rate Two [Member]          
Debt Instrument [Line Items]          
Effective percentage rate   4.62%      
Long-term debt subject to variable rate   $ 39      
Sempra Mexico [Member] | Other Long-term Debt, Currently Through January 2048 [Member]          
Debt Instrument [Line Items]          
Gross long-term debt   $ 540     0
Stated percentage rate   4.875%      
Sempra Mexico [Member] | Other Long Term Debt, Payable Currently Through March 2032, Variable Rate One [Member]          
Debt Instrument [Line Items]          
Weighted average rate   6.29%      
Long-term debt subject to variable rate   $ 178      
Sempra Renewables [Member] | Other LongTerm Debt, Variable Rate Loan Payable Currently Through December 2028 [Member]          
Debt Instrument [Line Items]          
Gross long-term debt   $ 77     84
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   $ 20     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%      
Sempra LNG & Midstream [Member] | Other Long Term Debt, Payable Currently Through December 2017 [Member]          
Debt Instrument [Line Items]          
Gross long-term debt   $ 0     6
Stated percentage rate   8.45%      
Other Sempra Energy [Member]          
Debt Instrument [Line Items]          
Long-term debt and capital lease obligations   $ 9,405     7,548
Current portion of long-term debt   (706)     (722)
Unamortized discount on long-term debt   (13)     (10)
Unamortized premium on long-term debt   4     4
Unamortized debt issuance costs   (65)     (31)
Long-term debt   8,625     6,789
LIBOR [Member] | Sempra Energy [Member] | Other Long Term Debt, Variable Rate Notes Due March 2021 [Member]          
Debt Instrument [Line Items]          
Variable percentage rate 0.45%        
Otay Mesa VIE [Member] | San Diego Gas and Electric Company [Member]          
Debt Instrument [Line Items]          
Current portion of long-term debt   (10)     (10)
Long-term debt   284     293
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   $ 295     $ 305
[1] Reflects reclassifications to conform to current year presentation, which we discuss in Note 1.