EMPLOYEE BENEFIT PLANS - NARRATIVE (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Defined Benefit Plan Disclosure [Line Items]
Dedicated assets in support of certain benefit plans	$ 567	$ 512	$ 488
Pension Plan
Defined Benefit Plan Disclosure [Line Items]
Plan amendments	0	0	5
Other Postretirement Benefits Plan
Defined Benefit Plan Disclosure [Line Items]
Plan amendments	0	0	0
San Diego Gas and Electric Company [Member] | Pension Plan
Defined Benefit Plan Disclosure [Line Items]
Plan amendments	0	0	3
San Diego Gas and Electric Company [Member] | Other Postretirement Benefits Plan
Defined Benefit Plan Disclosure [Line Items]
Plan amendments	0	0	0
SoCalGas | Pension Plan
Defined Benefit Plan Disclosure [Line Items]
Plan amendments	0	0	2
SoCalGas | Other Postretirement Benefits Plan
Defined Benefit Plan Disclosure [Line Items]
Plan amendments	0	0	0
Oncor Electric Delivery Company LLC | Sempra Texas Utilities | Other Postretirement Benefits Plan
Defined Benefit Plan Disclosure [Line Items]
Gain (loss) arising during the period	$ 7	$ 11	$ 27