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DEBT AND CREDIT FACILITIES - LONG-TERM DEBT (Details) - USD ($)
1 Months Ended
Mar. 31, 2021
Mar. 19, 2021
Dec. 31, 2020
Debt Instrument [Line Items]      
Maximum borrowing capacity $ 6,685,000,000    
Sempra Mexico [Member] | Variable Rate Loan Payable Maturing 2033 | ESJ [Member]      
Debt Instrument [Line Items]      
Loans payable acquired in acquisition   $ 177,000,000  
Unamortized debt issuance costs   $ 6,000,000  
Stated rate of debt (as a percent)   6.13%  
Percentage of loan bearing fixed rate   90.00%  
Percentage of loan bearing variable rate   10.00%  
Sempra Mexico [Member] | Variable Rate Loan Payable Maturing 2033 | ESJ [Member] | LIBOR [Member]      
Debt Instrument [Line Items]      
Spread on variable rate (as a percent) 2.89% 2.63%  
Basis spread, increase every four years (as a percent)   0.25%  
Sempra LNG [Member] | Loan Agreement To Finance Natural Gas Liquefaction Export Facility      
Debt Instrument [Line Items]      
Stated rate of debt (as a percent) 2.91%   2.82%
Term of debt instrument     5 years
Long-term Debt $ 119,000,000   $ 17,000,000
Maximum borrowing capacity     $ 1,600,000,000