DEBT AND CREDIT FACILITIES - SCHEDULE OF LONG-TERM DEBT INSTRUMENTS (Details) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018
Debt Instrument [Line Items]
Long-term lease liabilities	$ 1,263
Finance lease obligations	1,289
Current portion of long-term debt	(1,526)	$ (1,644)
Long-term debt and finance leases	20,785	20,903
San Diego Gas and Electric Company [Member]
Debt Instrument [Line Items]
Gross long-term debt	5,140	4,776
Long-term lease liabilities	1,250
Long term debt and lease obligations, including current maturities	6,410	6,268
Finance lease obligations	1,270
Current portion of long-term debt	(56)	(81)
Unamortized discount on long-term debt	(12)	(12)
Unamortized debt issuance costs	(36)	(37)
Debt and Lease Obligation	6,306	6,138
Long-term debt and finance leases	6,306	6,138
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	$ 89	125
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
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	400
Stated percentage rate	4.15%
San Diego Gas and Electric Company [Member] | First Mortgage Bonds, Due June 15 2049 [Member]
Debt Instrument [Line Items]
Gross long-term debt	$ 400	0
Stated percentage rate	4.10%
San Diego Gas and Electric Company [Member] | Finance Lease Obligations, Purchased Power Contracts [Member]
Debt Instrument [Line Items]
Long-term lease liabilities	$ 1,255	1,270
San Diego Gas and Electric Company [Member] | Finance Lease Obligations, Other [Member]
Debt Instrument [Line Items]
Long-term lease liabilities	15	2
San Diego Gas and Electric Company [Member] | Other Long-term Debt [Member]
Debt Instrument [Line Items]
Long term debt and lease obligations, including current maturities	1,270	1,492
Southern California Gas Company [Member]
Debt Instrument [Line Items]
Gross long-term debt	3,800	3,450
Long-term lease liabilities	13
Long term debt and lease obligations, including current maturities	3,828	3,462
Finance lease obligations	19	3
Finance lease obligations and other long term debt	28	12
Current portion of long-term debt	(6)	(3)
Unamortized discount on long-term debt	(7)	(6)
Unamortized debt issuance costs	(27)	(26)
Debt and Lease Obligation	3,788	3,427
Long-term debt and finance leases	3,788	3,427
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 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] | First Mortgage Bonds, Due June 2048 [Member]
Debt Instrument [Line Items]
Gross long-term debt	$ 400	400
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	550
Stated percentage rate	4.30%
Southern California Gas Company [Member] | First Mortgage Bonds, Due February 2050 [Member]
Debt Instrument [Line Items]
Gross long-term debt	$ 350	0
Stated percentage rate	3.95%
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 arrangement	$ 0	138
Sempra Energy [Member] | Other Long-term Debt, Due February 2019 [Member]
Debt Instrument [Line Items]
Gross long-term debt	0	$ 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	0	$ 500
Sempra Energy [Member] | Other Long-term Debt, October 2019 [Member]
Debt Instrument [Line Items]
Gross long-term debt	0	$ 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	$ 500
Stated percentage rate	2.40%
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	700
Sempra Energy [Member] | Other Long Term Debt, Variable Rate Notes Due March 2021 [Member]
Debt Instrument [Line Items]
Gross long-term debt	$ 850	850
Fixed interest rate after floating to fixed interest rate swaps	3.069%
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	500
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	1,000
Stated percentage rate	3.40%
Sempra Energy [Member] | Other Long Term Debt Due February 2038 [Member]
Debt Instrument [Line Items]
Gross long-term debt	$ 1,000	1,000
Stated percentage rate	3.80%
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	800
Stated percentage rate	4.00%
Sempra Energy [Member] | Other Long-term Debt, Junior Subordinated Notes, Due July 2079 [Member]
Debt Instrument [Line Items]
Gross long-term debt	$ 758	0
Stated percentage rate	5.75%
Sempra Mexico [Member] | Other Long-term Debt, Due January 2028 [Member]
Debt Instrument [Line Items]
Stated percentage rate	3.75%
Sempra Mexico [Member] | Other Long-term Debt, Due February 2023 [Member]
Debt Instrument [Line Items]
Gross long-term debt	$ 207	198
Stated percentage rate	6.30%
Fixed interest rate after floating to fixed interest rate swaps	4.12%
Sempra Mexico [Member] | Other Long-Term Debt, Due 2016 Through December 2026 [Member]
Debt Instrument [Line Items]
Gross long-term debt	$ 237	275
Fixed interest rate after floating to fixed interest rate swaps	4.88%
Sempra Mexico [Member] | Other Long-term Debt, Currently Through January 2028 [Member]
Debt Instrument [Line Items]
Gross long-term debt	$ 300	300
Sempra Mexico [Member] | Other Long-Term Debt, Payable 2016 Through March 2032 [Member]
Debt Instrument [Line Items]
Gross long-term debt	$ 423	447
Stated percentage rate	6.87%
Notional amount of derivative liability	$ 147
Long-term debt subject to fixed rate	241
Long-term debt subject to variable rate	$ 35
Sempra Mexico [Member] | Other Long-Term Debt, Payable 2016 Through March 2032 [Member] | Weighted Average [Member]
Debt Instrument [Line Items]
Fixed interest rate after floating to fixed interest rate swaps	6.54%
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	$ 11	4
Sempra Mexico [Member] | Other Long-Term Debt, Payable 2022 Through November 2034 [Member]
Debt Instrument [Line Items]
Gross long-term debt	$ 200	0
Fixed interest rate after floating to fixed interest rate swaps	4.0275%
Sempra LNG [Member] | Other Long-term Debt, Currently Through October 2026 [Member]
Debt Instrument [Line Items]
Gross long-term debt	$ 22	21
Sempra LNG [Member] | Other Long-term Debt, Currently Through October 2026 [Member] | Minimum [Member]
Debt Instrument [Line Items]
Stated percentage rate	2.87%
Sempra LNG [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]
Gross long-term debt	$ 12,298	13,023
Current portion of long-term debt	(1,464)	(1,560)
Unamortized discount on long-term debt	(35)	(38)
Unamortized debt issuance costs	(108)	(87)
Long-term debt and finance leases	$ 10,691	$ 11,338
LIBOR [Member] | Sempra Energy [Member] | Other Long-term Debt, Due July 2019 [Member]
Debt Instrument [Line Items]
Stated percentage rate		2.69%
LIBOR [Member] | Sempra Energy [Member] | Other Long-term Debt, Due January 2021 [Member]
Debt Instrument [Line Items]
Stated percentage rate	2.50%
LIBOR [Member] | Sempra Mexico [Member] | Other Long-Term Debt, Payable 2016 Through March 2032 [Member]
Debt Instrument [Line Items]
Stated percentage rate	5.12%
LIBOR [Member] | Sempra Mexico [Member] | Other Long-term Debt, Currently Through July 2028 [Member]
Debt Instrument [Line Items]
Stated percentage rate	5.75%
Otay Mesa VIE [Member]
Debt Instrument [Line Items]
Current portion of long-term debt		$ (28)
Otay Mesa VIE [Member] | San Diego Gas and Electric Company [Member]
Debt Instrument [Line Items]
Current portion of long-term debt		(28)
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	220
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]
Notional amount of derivative liability		$ 142
Fixed interest rate after floating to fixed interest rate swaps		5.2925%
Otay Mesa VIE [Member] | LIBOR [Member] | 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		4.7896%