COMMITMENTS AND CONTINGENCIES - CONTRACTUAL COMMITMENTS & ENVIRONMENTAL ISSUES (Details) $ in Millions	9 Months Ended
	Sep. 30, 2023 USD ($)
Loss Contingencies [Line Items]
Potential monetary sanctions threshold	$ 1
Potential monetary sanctions threshold (as a percent)	1.00%
Environmental cost, potential monetary sanctions threshold, actual amount	$ 53
Sempra Infrastructure | Natural Gas Storage and Transportation Contracts
Loss Contingencies [Line Items]
Change since 2022	877
Change in 2023	(29)
Change in 2024	38
Change in 2025	35
Change in 2026	33
Change in 2027	30
Change thereafter	770
Sempra Infrastructure | Liquefied Natural Gas Contracts
Loss Contingencies [Line Items]
Change in 2023	(980)
Change in 2024	(62)
Change in 2025	(45)
Change in 2026	(47)
Change in 2027	(58)
Change thereafter	(136)
San Diego Gas and Electric Company
Loss Contingencies [Line Items]
Environmental cost, potential monetary sanctions threshold, actual amount	19
San Diego Gas and Electric Company | Purchased-Power Contracts
Loss Contingencies [Line Items]
Change since 2022	482
Change in 2023	14
Change in 2024	3
Change in 2025	13
Change in 2026	32
Change in 2027	33
Change thereafter	387
Southern California Gas Company
Loss Contingencies [Line Items]
Environmental cost, potential monetary sanctions threshold, actual amount	$ 14