REVENUES - DISAGGREGATION OF REVENUE (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	$ 11,676	$ 10,310	$ 10,141
Utilities regulatory revenues	451	570	264
Other revenues	730	490	424
Total revenues	12,857	11,370	10,829
Utilities
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	10,540	9,455	9,184
Energy-related businesses
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	1,136	855	957
Gas
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	6,969	5,796	5,596
Electric
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	4,707	4,514	4,545
Operating Segments | San Diego Gas and Electric Company [Member]
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	5,144	4,920	4,819
Utilities regulatory revenues	360	393	106
Other revenues	0	0	0
Total revenues	5,504	5,313	4,925
Operating Segments | San Diego Gas and Electric Company [Member] | Utilities
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	5,144	4,920	4,819
Operating Segments | San Diego Gas and Electric Company [Member] | Energy-related businesses
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	0	0	0
Operating Segments | San Diego Gas and Electric Company [Member] | Gas
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	790	692	587
Operating Segments | San Diego Gas and Electric Company [Member] | Electric
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	4,354	4,228	4,232
Operating Segments | SoCalGas
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	5,424	4,571	4,367
Utilities regulatory revenues	91	177	158
Other revenues	0	0	0
Total revenues	5,515	4,748	4,525
Operating Segments | SoCalGas | Utilities
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	5,424	4,571	4,367
Operating Segments | SoCalGas | Energy-related businesses
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	0	0	0
Operating Segments | SoCalGas | Gas
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	5,424	4,571	4,367
Operating Segments | SoCalGas | Electric
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	0	0	0
Operating Segments | Sempra Infrastructure
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	1,246	912	1,024
Utilities regulatory revenues	0	0	0
Other revenues	751	488	430
Total revenues	1,997	1,400	1,454
Operating Segments | Sempra Infrastructure | Utilities
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	81	58	73
Operating Segments | Sempra Infrastructure | Energy-related businesses
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	1,165	854	951
Operating Segments | Sempra Infrastructure | Gas
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	856	623	711
Operating Segments | Sempra Infrastructure | Electric
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	390	289	313
Operating Segments | Sempra Renewables
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	0	0	5
Utilities regulatory revenues	0	0	0
Other revenues	0	0	5
Total revenues	0	0	10
Operating Segments | Sempra Renewables | Utilities
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	0	0	0
Operating Segments | Sempra Renewables | Energy-related businesses
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	0	0	5
Operating Segments | Sempra Renewables | Gas
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	0	0	0
Operating Segments | Sempra Renewables | Electric
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	0	0	5
Consolidating adjustments and Parent and other
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	(138)	(93)	(74)
Utilities regulatory revenues	0	0	0
Other revenues	(21)	2	(11)
Total revenues	(159)	(91)	(85)
Consolidating adjustments and Parent and other | Utilities
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	(109)	(94)	(75)
Consolidating adjustments and Parent and other | Energy-related businesses
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	(29)	1	1
Consolidating adjustments and Parent and other | Gas
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	(101)	(90)	(69)
Consolidating adjustments and Parent and other | Electric
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	$ (37)	$ (3)	$ (5)