ACQUISITIONS, DIVESTITURES AND DISCONTINUED OPERATIONS - DISCONTINUED OPERATIONS (Details) - USD ($) $ in Millions	1 Months Ended		3 Months Ended		6 Months Ended
	Jun. 30, 2020	Apr. 30, 2020	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Income from discontinued operations, net of income tax			$ 0	$ 1,777	$ 0	$ 1,857
Earnings attributable to noncontrolling interests			0	(2)	0	(10)
Earnings from discontinued operations attributable to Sempra			$ 0	1,775	$ 0	1,847
Discontinued Operations, Held-for-sale [Member] | Sempra South American Utilities [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Revenues				170		570
Cost of sales				(111)		(364)
Gain on sale of discontinued operations				2,915		2,915
Operating expenses				(20)		(66)
Interest and other				(3)		(3)
Income before income taxes				2,951		3,052
Income tax expense				(1,174)		(1,195)
Income from discontinued operations, net of income tax				1,777		1,857
Earnings from discontinued operations attributable to Sempra				1,775		1,847
Cumulative foreign translation adjustments	$ 645			$ 645		$ 645
Luz Del Sur [Member] | Discontinued Operations, Held-for-sale [Member] | Sempra South American Utilities [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Ownership interest (as a percent)		83.60%
Consideration to be received		$ 3,549
Pretax gain on sale		2,271
Gain on sale of discontinued operations		$ 1,499
Chilquinta Energia [Member] | Discontinued Operations, Held-for-sale [Member] | Sempra South American Utilities [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Ownership interest (as a percent)	100.00%			100.00%		100.00%
Consideration to be received	$ 2,232			$ 2,232		$ 2,232
Pretax gain on sale	644
Gain on sale of discontinued operations	$ 255
Eletrans | Discontinued Operations, Held-for-sale [Member] | Sempra South American Utilities [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Ownership interest (as a percent)	50.00%			50.00%		50.00%