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DEBT AND CREDIT FACILITIES - SCHEDULE OF LONG-TERM DEBT INSTRUMENTS (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Jan. 31, 2020
Dec. 31, 2019
Debt Instrument [Line Items]      
Long-term lease liabilities $ 1,294   $ 1,263
Finance lease obligations 1,330   1,289
Current portion of long-term debt (1,540)   (1,526)
Long-term debt and finance leases 21,781   20,785
San Diego Gas and Electric Company [Member]      
Debt Instrument [Line Items]      
Gross long-term debt 6,053   5,140
Long-term lease liabilities 1,250   1,250
Long term debt and lease obligations, including current maturities 7,529   6,410
Finance lease obligations 1,276   1,270
Current portion of long-term debt (611)   (56)
Unamortized discount on long-term debt (13)   (12)
Unamortized debt issuance costs (39)   (36)
Total debt and lease obligations 6,866   6,306
Long-term debt and finance leases $ 6,866   6,306
San Diego Gas and Electric Company [Member] | First Mortgage Bonds, Due August 2021 [Member]      
Debt Instrument [Line Items]      
Stated percentage rate 3.00%    
Gross long-term debt $ 350   350
San Diego Gas and Electric Company [Member] | First Mortgage Bonds Due February 2022 [Member]      
Debt Instrument [Line Items]      
Stated percentage rate 1.914%    
Gross long-term debt $ 53   89
San Diego Gas and Electric Company [Member] | First Mortgage Bonds, Due September 2023 [Member]      
Debt Instrument [Line Items]      
Stated percentage rate 3.60%    
Gross long-term debt $ 450   450
San Diego Gas and Electric Company [Member] | First Mortgage Bonds Due May 2026 [Member]      
Debt Instrument [Line Items]      
Stated percentage rate 2.50%    
Gross long-term debt $ 500   500
San Diego Gas and Electric Company [Member] | First Mortgage Bonds, Due June 2026 [Member]      
Debt Instrument [Line Items]      
Stated percentage rate 6.00%    
Gross long-term debt $ 250   250
San Diego Gas and Electric Company [Member] | First Mortgage Bonds, Due October 2030      
Debt Instrument [Line Items]      
Stated percentage rate 1.70%    
Gross long-term debt $ 800   0
San Diego Gas and Electric Company [Member] | First Mortgage Bonds, Due January And February 2034 [Member]      
Debt Instrument [Line Items]      
Stated percentage rate 5.875%    
Gross long-term debt $ 0   176
San Diego Gas and Electric Company [Member] | First Mortgage Bonds, Due May 2035 [Member]      
Debt Instrument [Line Items]      
Stated percentage rate 5.35%    
Gross long-term debt $ 250   250
San Diego Gas and Electric Company [Member] | First Mortgage Bonds, Due September 2037 [Member]      
Debt Instrument [Line Items]      
Stated percentage rate 6.125%    
Gross long-term debt $ 250   250
San Diego Gas and Electric Company [Member] | First Mortgage Bonds, Due May 2039 [Member]      
Debt Instrument [Line Items]      
Stated percentage rate 4.00%    
Gross long-term debt $ 0   75
San Diego Gas and Electric Company [Member] | First Mortgage Bonds, Due June 2039 [Member]      
Debt Instrument [Line Items]      
Stated percentage rate 6.00%    
Gross long-term debt $ 300   300
San Diego Gas and Electric Company [Member] | First Mortgage Bonds, Due May 2040 [Member]      
Debt Instrument [Line Items]      
Stated percentage rate 5.35%    
Gross long-term debt $ 250   250
San Diego Gas and Electric Company [Member] | First Mortgage Bonds, Due August 2040 [Member]      
Debt Instrument [Line Items]      
Stated percentage rate 4.50%    
Gross long-term debt $ 500   500
San Diego Gas and Electric Company [Member] | First Mortgage Bonds, Due November 2041 [Member]      
Debt Instrument [Line Items]      
Stated percentage rate 3.95%    
Gross long-term debt $ 250   250
San Diego Gas and Electric Company [Member] | First Mortgage Bonds, Due April 2042 [Member]      
Debt Instrument [Line Items]      
Stated percentage rate 4.30%    
Gross long-term debt $ 250   250
San Diego Gas and Electric Company [Member] | First Mortgage Bonds, Due June 2047 [Member]      
Debt Instrument [Line Items]      
Stated percentage rate 3.75%    
Gross long-term debt $ 400   400
San Diego Gas and Electric Company [Member] | First Mortgage Bonds, Due May 2048 [Member]      
Debt Instrument [Line Items]      
Stated percentage rate 4.15%    
Gross long-term debt $ 400   400
San Diego Gas and Electric Company [Member] | First Mortgage Bonds, Due June 15 2049 [Member]      
Debt Instrument [Line Items]      
Stated percentage rate 4.10%    
Gross long-term debt $ 400   400
San Diego Gas and Electric Company [Member] | First Mortgage Bonds, Due April 2050      
Debt Instrument [Line Items]      
Stated percentage rate 3.32%    
Gross long-term debt $ 400   0
San Diego Gas and Electric Company [Member] | Other Long Term Debt, Variable Rate Notes Due March 2021 [Member]      
Debt Instrument [Line Items]      
Stated percentage rate 0.95%    
Gross long-term debt $ 200   0
San Diego Gas and Electric Company [Member] | Finance Lease Obligations, Purchased Power Contracts [Member]      
Debt Instrument [Line Items]      
Long-term lease liabilities 1,237   1,255
San Diego Gas and Electric Company [Member] | Finance Lease Obligations, Other [Member]      
Debt Instrument [Line Items]      
Long-term lease liabilities 39   15
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 1,476   1,270
Southern California Gas Company [Member]      
Debt Instrument [Line Items]      
Gross long-term debt 4,450   3,800
Long-term lease liabilities 44   13
Long term debt and lease obligations, including current maturities 4,813   3,828
Finance lease obligations 54   19
Finance lease obligations and other long term debt 363   28
Current portion of long-term debt (10)   (6)
Unamortized discount on long-term debt (8)   (7)
Unamortized debt issuance costs (32)   (27)
Total debt and lease obligations 4,763   3,788
Long-term debt and finance leases $ 4,763   3,788
Southern California Gas Company [Member] | First Mortgage Bonds, Due June 2026 [Member]      
Debt Instrument [Line Items]      
Stated percentage rate 2.60%    
Gross long-term debt $ 500   500
Southern California Gas Company [Member] | First Mortgage Bonds, Due September 2024 [Member]      
Debt Instrument [Line Items]      
Stated percentage rate 3.15%    
Gross long-term debt $ 500   500
Southern California Gas Company [Member] | First Mortgage Bonds Due June 2025 [Member]      
Debt Instrument [Line Items]      
Stated percentage rate 3.20%    
Gross long-term debt $ 350   350
Southern California Gas Company [Member] | First Mortgage Bonds, Due February 2030      
Debt Instrument [Line Items]      
Stated percentage rate 2.55% 2.55%  
Gross long-term debt $ 650   0
Southern California Gas Company [Member] | First Mortgage Bonds, Due November 2035 [Member]      
Debt Instrument [Line Items]      
Stated percentage rate 5.75%    
Gross long-term debt $ 250   250
Southern California Gas Company [Member] | First Mortgage Bonds, Due November 2040 [Member]      
Debt Instrument [Line Items]      
Stated percentage rate 5.125%    
Gross long-term debt $ 300   300
Southern California Gas Company [Member] | First Mortgage Bonds, Due September 2042 [Member]      
Debt Instrument [Line Items]      
Stated percentage rate 3.75%    
Gross long-term debt $ 350   350
Southern California Gas Company [Member] | First Mortgage Bonds, Due March 2044 [Member]      
Debt Instrument [Line Items]      
Stated percentage rate 4.45%    
Gross long-term debt $ 250   250
Southern California Gas Company [Member] | First Mortgage Bonds, Due June 2048 [Member]      
Debt Instrument [Line Items]      
Stated percentage rate 4.125%    
Gross long-term debt $ 400   400
Southern California Gas Company [Member] | First Mortgage Bonds, Due January 2049 [Member]      
Debt Instrument [Line Items]      
Stated percentage rate 4.30%    
Gross long-term debt $ 550   550
Southern California Gas Company [Member] | First Mortgage Bonds, Due February 2050 [Member]      
Debt Instrument [Line Items]      
Stated percentage rate 3.95%    
Gross long-term debt $ 350   350
Southern California Gas Company [Member] | Other Long-term Debt, Due September 2023      
Debt Instrument [Line Items]      
Stated percentage rate 0.57%    
Gross long-term debt $ 300   0
Southern California Gas Company [Member] | Other Long-term Debt, Due May 2026 [Member]      
Debt Instrument [Line Items]      
Stated percentage rate 1.875%    
Gross long-term debt $ 4   4
Southern California Gas Company [Member] | Other Long-term Debt, Due January 2028 [Member]      
Debt Instrument [Line Items]      
Stated percentage rate 5.67%    
Gross long-term debt $ 5   5
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 February 2020 [Member]      
Debt Instrument [Line Items]      
Stated percentage rate 2.40%    
Gross long-term debt $ 0   500
Sempra Energy [Member] | Other Long Term Debt Due March 2020 [Member]      
Debt Instrument [Line Items]      
Stated percentage rate 2.40%    
Gross long-term debt $ 0   500
Sempra Energy [Member] | Other Long Term Debt, Due November 2020 [Member]      
Debt Instrument [Line Items]      
Stated percentage rate 2.85%    
Gross long-term debt $ 0   400
Sempra Energy [Member] | Other Long-term Debt, Due January 2021 [Member]      
Debt Instrument [Line Items]      
Gross long-term debt $ 0   700
Sempra Energy [Member] | Other Long Term Debt, Due October 2022 [Member]      
Debt Instrument [Line Items]      
Stated percentage rate 2.875%    
Gross long-term debt $ 500   500
Sempra Energy [Member] | Other Long-term Debt, Due February 2023 [Member]      
Debt Instrument [Line Items]      
Stated percentage rate 2.90%    
Gross long-term debt $ 500   500
Sempra Energy [Member] | Other Long-term Debt, Due December 2023 [Member]      
Debt Instrument [Line Items]      
Stated percentage rate 4.05%    
Gross long-term debt $ 500   500
Sempra Energy [Member] | Other Long-term Debt, Due June 2024 [Member]      
Debt Instrument [Line Items]      
Stated percentage rate 3.55%    
Gross long-term debt $ 500   500
Sempra Energy [Member] | Other Long Term Debt Due November 2025 [Member]      
Debt Instrument [Line Items]      
Stated percentage rate 3.75%    
Gross long-term debt $ 350   350
Sempra Energy [Member] | Other Long Term Debt Due June 2027 [Member]      
Debt Instrument [Line Items]      
Stated percentage rate 3.25%    
Gross long-term debt $ 750   750
Sempra Energy [Member] | Other Long Term Debt Due February 2028 [Member]      
Debt Instrument [Line Items]      
Stated percentage rate 3.40%    
Gross long-term debt $ 1,000   1,000
Sempra Energy [Member] | Other Long Term Debt Due February 2038 [Member]      
Debt Instrument [Line Items]      
Stated percentage rate 3.80%    
Gross long-term debt $ 1,000   1,000
Sempra Energy [Member] | Other Long-term Debt, Due October 2039 [Member]      
Debt Instrument [Line Items]      
Stated percentage rate 6.00%    
Gross long-term debt $ 750   750
Sempra Energy [Member] | Other Long Term Debt Due February 2048 [Member]      
Debt Instrument [Line Items]      
Stated percentage rate 4.00%    
Gross long-term debt $ 800   800
Sempra Energy [Member] | Other Long-term Debt, Junior Subordinated Notes, Due July 2079 [Member]      
Debt Instrument [Line Items]      
Stated percentage rate 5.75%    
Gross long-term debt $ 758   758
Sempra Mexico [Member] | Other Long-term Debt, 6.3% Notes Due February 2023      
Debt Instrument [Line Items]      
Stated percentage rate 6.30%    
Gross long-term debt $ 197   207
Fixed interest rate after floating to fixed interest rate swaps 4.124%    
Sempra Mexico [Member] | Other Long-Term Debt, Due 2016 Through December 2026 [Member]      
Debt Instrument [Line Items]      
Gross long-term debt $ 196   237
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]      
Stated percentage rate 3.75%    
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 $ 398   423
Sempra Mexico [Member] | Other Long-Term Debt, Payable 2016 Through March 2032 [Member] | Weighted Average [Member]      
Debt Instrument [Line Items]      
Stated percentage rate 6.87%    
Gross long-term debt $ 234    
Sempra Mexico [Member] | Other Long-term Debt, Currently Through January 2048 [Member]      
Debt Instrument [Line Items]      
Stated percentage rate 4.875%    
Gross long-term debt $ 540   540
Sempra Mexico [Member] | Other Long-term Debt, Currently Through July 2028 [Member]      
Debt Instrument [Line Items]      
Gross long-term debt 0   11
Sempra Mexico [Member] | Other Long-term Debt, Variable Rate Payable Through November 2034      
Debt Instrument [Line Items]      
Gross long-term debt $ 200   200
Fixed interest rate after floating to fixed interest rate swaps 4.0275%    
Sempra Mexico [Member] | Other Long-term Debt, 4.75% Notes Due September 2051      
Debt Instrument [Line Items]      
Stated percentage rate 4.75%    
Gross long-term debt $ 800   0
Sempra Mexico [Member] | Other Long-term Debt, Variable Rate Loan Due November 2034      
Debt Instrument [Line Items]      
Gross long-term debt $ 100   0
Fixed interest rate after floating to fixed interest rate swaps 2.38%    
Sempra Mexico [Member] | Other Long-Term Debt, Payable 2022 Through November 2034 [Member]      
Debt Instrument [Line Items]      
Stated percentage rate 2.90%    
Gross long-term debt $ 241   0
Sempra LNG [Member] | Other Long-term Debt, Currently Through October 2026 [Member]      
Debt Instrument [Line Items]      
Gross long-term debt $ 0   22
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%    
Sempra LNG [Member] | Other Long-Term Debt, Variable Rate Loan Due December 2025      
Debt Instrument [Line Items]      
Stated percentage rate 2.82%    
Gross long-term debt $ 17   0
Other Sempra Energy [Member]      
Debt Instrument [Line Items]      
Gross long-term debt 11,247   12,298
Current portion of long-term debt (919)   (1,464)
Unamortized discount on long-term debt (55)   (35)
Unamortized debt issuance costs (121)   (108)
Long-term debt and finance leases $ 10,152   $ 10,691
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 3.45%    
Gross long-term debt $ 34    
LIBOR [Member] | Sempra Mexico [Member] | Other Long-Term Debt, Payable 2016 Through March 2032 [Member] | Weighted Average [Member]      
Debt Instrument [Line Items]      
Gross long-term debt $ 130    
Fixed interest rate after floating to fixed interest rate swaps 6.54%    
LIBOR [Member] | Sempra Mexico [Member] | Other Long-term Debt, Currently Through July 2028 [Member]      
Debt Instrument [Line Items]      
Stated percentage rate 5.75%