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ACQUISTIONS, DIVESTITURES AND DISCONTINUED OPERATIONS - Divestitures (Details) - USD ($) $ in Millions			1 Months Ended			12 Months Ended
	Apr. 22, 2019	Dec. 13, 2018	Apr. 30, 2019	Dec. 31, 2018	Jun. 30, 2018	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Feb. 07, 2019	Jan. 31, 2019
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Gain (loss) on deconsolidation		$ 367
Current liabilities						$ 0	$ 444
(Loss) gain on sale of assets						$ (3)	$ 63	$ 513
Disposal Group Held-for-sale [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Asset impairment charges					$ 1,500
Asset impairment charges, after taxes and noncontrolling interests					900
Disposal Group Disposed of by Sale [Member] \| Certain Subsidiaries Of Sempra Renewables [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Gain on sale of equity interests		513
Proceeds from sale, net of transaction costs		1,585
Cash		(7)
Restricted cash		(7)
Other current assets		(14)
Property, plant and equipment, net		(1,303)
Other investments		(329)
Other noncurrent assets		(24)
Current liabilities		8
Long-term debt		70
Asset retirement obligations		52
Other noncurrent liabilities		5
Noncontrolling interests		486
Accumulated other comprehensive income		(9)
Sempra Renewables [Member] \| Disposal Group Held-for-sale [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Asset impairment charges					200
Asset impairment charges, after taxes and noncontrolling interests					145
Sempra Renewables [Member] \| Disposal Group Held-for-sale [Member] \| Wind Generation Projects [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Proceeds from sale	$ 569
(Loss) gain on sale of assets	61		$ 61
Gain on sale of assets, after tax	$ 45		$ 45
Sempra Renewables [Member] \| Disposal Group Disposed of by Sale [Member] \| Certain Subsidiaries Of Sempra Renewables [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Proceeds from sale		$ 1,600
Sempra Renewables [Member] \| Disposal Group Disposed of by Sale [Member] \| Certain Subsidiaries Of Sempra Renewables [Member] \| Broken Bow 2 Wind [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Ownership percentage held by noncontrolling owners				50.00%				50.00%
Sempra LNG [Member] \| Disposal Group Held-for-sale [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Asset impairment charges				$ (183)	1,300			$ 1,100
Asset impairment charges, after taxes and noncontrolling interests				$ (126)	$ 755			$ 629
Sempra LNG [Member] \| Disposal Group Disposed of by Sale [Member] \| Mississippi Hub And Bay Gas [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Proceeds from sale									$ 322
Sempra LNG [Member] \| Disposal Group Disposed of by Sale [Member] \| Other Non-Utility assets [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Proceeds from sale										$ 5