ACQUISITIONS, DIVESTITURES AND DISCONTINUED OPERATIONS - DISCONTINUED OPERATIONS (Details) - USD ($) $ in Millions	1 Months Ended		3 Months Ended		9 Months Ended
	Jun. 30, 2020	Apr. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
(Loss) income from discontinued operations, net of income tax			$ 0	$ (7)	$ 0	$ 1,850
Earnings attributable to noncontrolling interests			0	0	0	(10)
(Losses) earnings from discontinued operations attributable to Sempra			$ 0	(7)	$ 0	1,840
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]
(Loss) gain on sale of discontinued operations				(16)		2,899
Revenues				0		570
Cost of sales				0		(364)
Operating expenses				0		(66)
Interest and other				0		(3)
Income before income taxes				(16)		3,036
Income tax benefit (expense)				9		(1,186)
(Loss) income from discontinued operations, net of income tax				(7)		1,850
(Losses) earnings from discontinued operations attributable to Sempra				$ (7)		$ 1,840
Cumulative foreign translation adjustments	$ 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
(Loss) 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%
Consideration to be received	$ 2,216
Pretax gain on sale	628
(Loss) gain on sale of discontinued operations	$ 248
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%