DEBT AND CREDIT FACILITIES - CALLABLE LONG-TERM DEBT (Details) $ in Millions	Dec. 31, 2020 USD ($)
Schedule Of Callable Long-term Debt [Line Items]
Callable long-term debt, not subject to make-whole provisions	$ 1,803
Callable long-term debt, subject to make-whole provisions	19,006
San Diego Gas and Electric Company [Member]
Schedule Of Callable Long-term Debt [Line Items]
Callable long-term debt, not subject to make-whole provisions	200
Callable long-term debt, subject to make-whole provisions	6,053
Southern California Gas Company [Member]
Schedule Of Callable Long-term Debt [Line Items]
Callable long-term debt, not subject to make-whole provisions	304
Callable long-term debt, subject to make-whole provisions	4,450
Other Sempra Energy [Member]
Schedule Of Callable Long-term Debt [Line Items]
Callable long-term debt, not subject to make-whole provisions	1,299
Callable long-term debt, subject to make-whole provisions	$ 8,503