REVENUES - DISAGGREGATION OF REVENUE (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	$ 3,689	$ 3,141
Utilities regulatory revenues	25	(28)
Other revenues	106	146
Total revenues	3,820	3,259
Utilities
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	3,412	2,873
Energy-related businesses
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	277	268
Gas
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	2,445	2,118
Electric
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	1,244	1,023
Operating Segments | San Diego Gas and Electric Company
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	1,501	1,216
Utilities regulatory revenues	(56)	121
Other revenues	0	0
Total revenues	1,445	1,337
Operating Segments | San Diego Gas and Electric Company | Utilities
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	1,501	1,216
Operating Segments | San Diego Gas and Electric Company | Energy-related businesses
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	0	0
Operating Segments | San Diego Gas and Electric Company | Gas
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	330	273
Operating Segments | San Diego Gas and Electric Company | Electric
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	1,171	943
Operating Segments | Southern California Gas Company
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	1,912	1,657
Utilities regulatory revenues	81	(149)
Other revenues	0	0
Total revenues	1,993	1,508
Operating Segments | Southern California Gas Company | Utilities
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	1,912	1,657
Operating Segments | Southern California Gas Company | Energy-related businesses
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	0	0
Operating Segments | Southern California Gas Company | Gas
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	1,912	1,657
Operating Segments | Southern California Gas Company | Electric
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	0	0
Operating Segments | Sempra Infrastructure
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	320	296
Utilities regulatory revenues	0	0
Other revenues	104	153
Total revenues	424	449
Operating Segments | Sempra Infrastructure | Utilities
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	28	27
Operating Segments | Sempra Infrastructure | Energy-related businesses
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	292	269
Operating Segments | Sempra Infrastructure | Gas
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	229	212
Operating Segments | Sempra Infrastructure | Electric
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	91	84
Consolidation, Eliminations
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	(44)	(28)
Utilities regulatory revenues	0	0
Other revenues	2	(7)
Total revenues	(42)	(35)
Consolidation, Eliminations | Utilities
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	(29)	(27)
Consolidation, Eliminations | Energy-related businesses
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	(15)	(1)
Consolidation, Eliminations | Gas
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	(26)	(24)
Consolidation, Eliminations | Electric
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	$ (18)	$ (4)