SIGNIFICANT ACCOUNTING POLICIES AND OTHER FINANCIAL DATA - NONCONTROLLING INTERESTS (Details) $ / shares in Units, $ / shares in Units, $ in Millions, $ in Billions				1 Months Ended							3 Months Ended	12 Months Ended
	Oct. 01, 2021 USD ($)	Mar. 30, 2020 USD ($)	Feb. 07, 2019	Oct. 31, 2021 USD ($)	Sep. 30, 2021 USD ($) $ / shares shares	Sep. 30, 2021 MXN ($) $ / shares shares	Jul. 31, 2021 USD ($)	May 31, 2021 USD ($) shares	Dec. 31, 2020	Feb. 28, 2019 USD ($)	Mar. 31, 2020 USD ($)	Dec. 31, 2021 USD ($) shares	Dec. 31, 2020 USD ($) shares	Dec. 31, 2019 USD ($) shares	Feb. 16, 2022 shares	Dec. 21, 2021 USD ($)	Oct. 15, 2021 $ / shares	Apr. 30, 2021	Dec. 31, 2018
Noncontrolling Interest [Line Items]
Increase in the noncontrolling interest balance from the sale of noncontrolling interest												$ 2,712	$ 28	$ 5
Stock repurchased in the period												339	566	26
Income tax expense (benefit)												99	249	315
Equitization of long-term debt for deficit held by NCI													(22)
Noncontrolling Interest, Decrease from Deconsolidation												(1)	236	440
Proceeds from sales of noncontrolling interests, net												$ 3,206	$ 26	$ 5
Shares issued in IEnova exchange offer | shares								12,306,777				12,306,777	0	0
IEnova
Noncontrolling Interest [Line Items]
Common stock exchange ratio								0.0323
Increase in shareholders' equity					$ 72
Common Stock, Shares, Acquired | shares					51,014,545	51,014,545		381,015,194
Common stock acquired					$ 202	$ 4.0
Share price (in dollars per share) | (per share)					$ 3.95	$ 78.97
Sempra Infrastructure | IEnova
Noncontrolling Interest [Line Items]
Stock repurchased in the period											$ 9		$ 231	$ 10
Stock repurchased during the period (in shares) | shares													77,122,780	2,620,000
IEnova
Noncontrolling Interest [Line Items]
Noncontrolling interest, percent of funding	20.00%
IEnova | SI Partners
Noncontrolling Interest [Line Items]
Ownership percentage held by noncontrolling owners												99.90%
IEnova | Sempra LNG
Noncontrolling Interest [Line Items]
Ownership percentage sold									16.60%
IEnova | Sempra Infrastructure
Noncontrolling Interest [Line Items]
Ownership interest (as a percent)									70.20%				70.20%	66.60%					66.50%
Bay Gas | Sempra LNG
Noncontrolling Interest [Line Items]
Ownership interest (as a percent)			9.10%
Cash consideration (fair value of total consideration)										$ 20
ICM Ventures Holdings B.V. [Member] | Sempra Infrastructure
Noncontrolling Interest [Line Items]
Ownership percentage held by noncontrolling owners							17.50%
Ownership interest (as a percent)											82.50%			53.70%
Payments to acquire minority interest							$ 7
Liberty Gas Storage [Member] | Sempra LNG
Noncontrolling Interest [Line Items]
Ownership percentage held by noncontrolling owners		24.60%
IEnova
Noncontrolling Interest [Line Items]
Ownership interest (as a percent)	99.90%				99.90%	99.90%		96.40%										70.20%
Increase in shareholders' equity					$ 17			$ 1,400
Share price (in pesos per share) | $ / shares																	$ 78.97
Noncontrolling Interest, Decrease from Deconsolidation					188			1,400
Purchase of noncontrolling interest, transaction costs					$ 4			$ 12
Noncontrolling interest, remaining shares of noncontrolling interest | shares												1,212,981
IEnova | Subsequent Event
Noncontrolling Interest [Line Items]
Noncontrolling interest, remaining shares of noncontrolling interest | shares															629,784
IEnova | Sempra Infrastructure
Noncontrolling Interest [Line Items]
Ownership interest (as a percent)												99.90%
SI Partners
Noncontrolling Interest [Line Items]
Ownership interest in partnership (as a percent)	80.00%
Distribution requirement (as a percent)	85.00%
SI Partners | Abu Dhabi Investment Authority
Noncontrolling Interest [Line Items]
Sale of noncontrolling interest, purchase price																$ 1,800
Sale of noncontrolling interest (as a percent)																10.00%
SI Partners | KKR
Noncontrolling Interest [Line Items]
Sale of noncontrolling interest (as a percent)				20.00%
Income tax expense (benefit)				$ 72
SI Partners | Sempra Energy
Noncontrolling Interest [Line Items]
Ownership percentage held by noncontrolling owners																70.00%
SI Partners | KKR
Noncontrolling Interest [Line Items]
Ownership percentage held by noncontrolling owners																20.00%
SI Partners | Abu Dhabi Investment Authority
Noncontrolling Interest [Line Items]
Ownership percentage held by noncontrolling owners																10.00%
SI Partners | Sempra Infrastructure
Noncontrolling Interest [Line Items]
Ownership percentage held by noncontrolling owners	0.20%											20.00%
Sale of noncontrolling interest, purchase price	$ 3,400
Increase in the noncontrolling interest balance from the sale of noncontrolling interest	1,300
Sale of noncontrolling interest, change in equity	1,400
Sale of noncontrolling interest, transaction costs	173
Sale of noncontrolling interest, deferred income tax liability	490
Sale of noncontrolling interest, transaction costs reimbursed	$ 149
Ownership interest (as a percent)												80.00%
Bay Gas | Sempra LNG
Noncontrolling Interest [Line Items]
Sale of interest (as a percent)			100.00%
Liberty Gas Storage, LLC | Sempra LNG
Noncontrolling Interest [Line Items]
Payments to acquire minority interest		$ 7
Equitization of long-term debt for deficit held by NCI		22
Increase from equity of noncontrolling interest		$ 2
Liberty Gas Storage, LLC | Liberty Gas Storage [Member] | Sempra LNG
Noncontrolling Interest [Line Items]
Ownership percentage held by noncontrolling owners									100.00%				100.00%