SIGNIFICANT ACCOUNTING POLICIES AND OTHER FINANCIAL DATA - PROPERTY, PLANT, AND EQUIPMENT (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Property, Plant and Equipment [Line Items]
Property, plant and equipment	$ 58,940	$ 53,928	$ 49,329
Depreciation expense	1,833	1,646	1,551
Accumulated depreciation	15,046	13,925	12,877
San Diego Gas and Electric Company [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment	26,456	24,436	22,504
Depreciation expense	884	797	757
Accumulated depreciation	6,408	6,015	5,537
SoCalGas
Property, Plant and Equipment [Line Items]
Property, plant and equipment	23,104	21,180	19,362
Depreciation expense	711	649	598
Accumulated depreciation	6,861	6,437	6,038
Natural gas operations | San Diego Gas and Electric Company [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment	$ 3,200	$ 2,805	$ 2,534
Depreciation rates (percentage)	2.55%	2.51%	2.47%
Accumulated depreciation	$ 919	$ 870	$ 832
Natural gas operations | SoCalGas
Property, Plant and Equipment [Line Items]
Property, plant and equipment	$ 21,894	$ 19,961	$ 18,370
Depreciation rates (percentage)	3.65%	3.63%	3.60%
Accumulated depreciation	$ 6,845	$ 6,422	$ 6,023
Electric distribution | San Diego Gas and Electric Company [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment	$ 9,471	$ 8,592	$ 7,985
Depreciation rates (percentage)	3.93%	3.90%	3.94%
Electric transmission | San Diego Gas and Electric Company [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment	$ 7,577	$ 7,156	$ 6,577
Depreciation rates (percentage)	3.02%	3.10%	2.79%
Electric generation | San Diego Gas and Electric Company [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment	$ 2,446	$ 2,440	$ 2,415
Depreciation rates (percentage)	4.74%	4.56%	4.50%
Other electric | San Diego Gas and Electric Company [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment	$ 2,100	$ 1,743	$ 1,492
Depreciation rates (percentage)	7.23%	6.92%	6.61%
Other non-utility | SoCalGas
Property, Plant and Equipment [Line Items]
Property, plant and equipment	$ 50	$ 45	$ 34
Depreciation rates (percentage)	2.23%	3.80%	5.08%
Accumulated depreciation	$ 16	$ 15	$ 15
Other non-utility | Sempra Infrastructure and parent
Property, Plant and Equipment [Line Items]
Accumulated depreciation	1,777	1,473	1,302
Land and land rights | Other Operating Units and Parent
Property, Plant and Equipment [Line Items]
Property, plant and equipment	$ 291	283	278
Land and land rights | Minimum | Other Operating Units and Parent
Property, Plant and Equipment [Line Items]
Estimated useful life	16 years
Land and land rights | Maximum | Other Operating Units and Parent
Property, Plant and Equipment [Line Items]
Estimated useful life	50 years
Land and land rights | Weighted Average | Other Operating Units and Parent
Property, Plant and Equipment [Line Items]
Estimated useful life	36 years
Pipelines and storage | Other Operating Units and Parent
Property, Plant and Equipment [Line Items]
Property, plant and equipment	$ 3,698	3,482	3,596
Pipelines and storage | Minimum | Other Operating Units and Parent
Property, Plant and Equipment [Line Items]
Estimated useful life	5 years
Pipelines and storage | Maximum | Other Operating Units and Parent
Property, Plant and Equipment [Line Items]
Estimated useful life	50 years
Pipelines and storage | Weighted Average | Other Operating Units and Parent
Property, Plant and Equipment [Line Items]
Estimated useful life	42 years
Generating plants | Other Operating Units and Parent
Property, Plant and Equipment [Line Items]
Property, plant and equipment	$ 1,659	1,288	1,154
Generating plants | Minimum | Other Operating Units and Parent
Property, Plant and Equipment [Line Items]
Estimated useful life	11 years
Generating plants | Maximum | Other Operating Units and Parent
Property, Plant and Equipment [Line Items]
Estimated useful life	30 years
Generating plants | Weighted Average | Other Operating Units and Parent
Property, Plant and Equipment [Line Items]
Estimated useful life	27 years
LNG terminals | Other Operating Units and Parent
Property, Plant and Equipment [Line Items]
Property, plant and equipment	$ 1,138	1,138	1,134
Estimated useful life	43 years
LNG terminals | Weighted Average | Other Operating Units and Parent
Property, Plant and Equipment [Line Items]
Estimated useful life	43 years
Liquid fuels terminals | Other Operating Units and Parent
Property, Plant and Equipment [Line Items]
Property, plant and equipment	$ 420	0	0
Estimated useful life	37 years
Liquid fuels terminals | Weighted Average | Other Operating Units and Parent
Property, Plant and Equipment [Line Items]
Estimated useful life	37 years
Other | Other Operating Units and Parent
Property, Plant and Equipment [Line Items]
Property, plant and equipment	$ 370	359	180
Other | Minimum | Other Operating Units and Parent
Property, Plant and Equipment [Line Items]
Estimated useful life	3 years
Other | Maximum | Other Operating Units and Parent
Property, Plant and Equipment [Line Items]
Estimated useful life	50 years
Other | Weighted Average | Other Operating Units and Parent
Property, Plant and Equipment [Line Items]
Estimated useful life	13 years
Construction work in progress | San Diego Gas and Electric Company [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment	$ 1,662	1,700	1,501
Construction work in progress | SoCalGas
Property, Plant and Equipment [Line Items]
Property, plant and equipment	1,160	1,174	958
Construction work in progress | Other Operating Units and Parent
Property, Plant and Equipment [Line Items]
Property, plant and equipment	1,494	1,514	895
Other | Other Operating Units and Parent
Property, Plant and Equipment [Line Items]
Property, plant and equipment	$ 310	248	226
Other | Minimum | Other Operating Units and Parent
Property, Plant and Equipment [Line Items]
Estimated useful life	4 years
Other | Maximum | Other Operating Units and Parent
Property, Plant and Equipment [Line Items]
Estimated useful life	50 years
Other | Weighted Average | Other Operating Units and Parent
Property, Plant and Equipment [Line Items]
Estimated useful life	21 years
Total Other Operating Units And Parent | Other Operating Units and Parent
Property, Plant and Equipment [Line Items]
Property, plant and equipment	$ 9,380	8,312	7,463
Plant, pipeline and other distribution assets of ecogas
Property, Plant and Equipment [Line Items]
Accumulated depreciation	55	51	49
Plant, pipeline and other distribution assets of ecogas | Other Operating Units and Parent
Property, Plant and Equipment [Line Items]
Property, plant and equipment	211	191	178
Electric | San Diego Gas and Electric Company [Member]
Property, Plant and Equipment [Line Items]
Accumulated depreciation	5,489	$ 5,145	$ 4,705
Southwest Powerlink (SWPL) transmission line | Electric transmission | San Diego Gas and Electric Company [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment	542
Accumulated depreciation	292
Southwest Powerlink (SWPL) transmission line | Construction work in progress | San Diego Gas and Electric Company [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment	$ 5
Southwest Powerlink | Southwest Powerlink (SWPL) transmission line | Electric transmission | San Diego Gas and Electric Company [Member]
Property, Plant and Equipment [Line Items]
Ownership interest (as a percent)	86.00%