INVESTMENTS IN UNCONSOLIDATED ENTITIES - SUMMARIZED FINANCIAL INFORMATION (Details) - USD ($) $ in Millions		3 Months Ended								10 Months Ended	12 Months Ended
	Dec. 13, 2018	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Schedule of Equity Method Investments [Line Items]
Operating revenues											$ 10,025	$ 9,448	$ 8,539
Net income		$ 432	$ 421	$ 2,305	$ 947	$ 500	$ 909	$ 435	$ 518		4,105	2,362	1,126
Current assets		4,511				3,339					4,511	3,339
Current liabilities		6,839				9,150					6,839	9,150
Other Equity Method Investments [Member]
Schedule of Equity Method Investments [Line Items]
Operating revenues											2,341	798	706
Operating expense											(706)	(372)	(609)
Income from operations											1,635	426	97
Interest expense											(514)	(401)	(322)
Net income											1,132	85	$ (36)
Current assets		1,035				1,124					1,035	1,124
Noncurrent assets		15,304				15,039					15,304	15,039
Current liabilities		1,342				1,232					1,342	1,232
Noncurrent liabilities		12,863				11,438					12,863	11,438
Sempra Renewables [Member] | Broken Bow 2 Wind [Member]
Schedule of Equity Method Investments [Line Items]
Ownership percentage in consolidated entity	50.00%
Oncor Electric Delivery Holdings Company LLC [Member] | Equity Method Investment, Nonconsolidated Investee or Group of Investees [Member]
Schedule of Equity Method Investments [Line Items]
Operating revenues										$ 3,347	4,511	4,347
Operating expense										(2,434)	(3,224)	(3,135)
Income from operations										913	1,287	1,212
Interest expense										(285)	(405)	(375)
Income tax expense										(119)	(146)	(131)
Net income										455	703	643
Noncontrolling interest held by TTI										(94)	(141)	(129)
Earnings attributable to Sempra Energy										$ 360	562	514
Current assets		1,045				913					1,045	913
Noncurrent assets		28,022				26,012					28,022	26,012
Current liabilities		1,120				1,626					1,120	1,626
Noncurrent liabilities		15,611				14,125					15,611	14,125
Noncontrolling interest held by TTI		$ 2,737				$ 2,473					$ 2,737	$ 2,473