EMPLOYEE BENEFIT PLANS - OBLIGATIONS OF FUNDED AND UNFUNDED PENSION AND PBOP PLANS (Details) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Pension Plan
Defined Benefit Plan Disclosure [Line Items]
Accumulated benefit obligation	$ 2,865	$ 2,574
Pension Plan | SDG&E
Defined Benefit Plan Disclosure [Line Items]
Accumulated benefit obligation	769	678
Pension Plan | SoCalGas
Defined Benefit Plan Disclosure [Line Items]
Accumulated benefit obligation	1,799	1,644
Funded Plan | Pension Plan
Defined Benefit Plan Disclosure [Line Items]
Projected benefit obligation	2,925	2,476
Accumulated benefit obligation	2,712	2,277
Fair value of plan assets	2,664	2,205
Funded Plan | Pension Plan | SDG&E
Defined Benefit Plan Disclosure [Line Items]
Projected benefit obligation	781	691
Accumulated benefit obligation	746	658
Fair value of plan assets	726	670
Funded Plan | Pension Plan | SoCalGas
Defined Benefit Plan Disclosure [Line Items]
Projected benefit obligation	1,944	1,785
Accumulated benefit obligation	1,771	1,619
Fair value of plan assets	1,744	1,535
Unfunded Plan | Pension Plan
Defined Benefit Plan Disclosure [Line Items]
Projected benefit obligation	182	153
Accumulated benefit obligation	153	124
Unfunded Plan | Pension Plan | SDG&E
Defined Benefit Plan Disclosure [Line Items]
Projected benefit obligation	26	23
Accumulated benefit obligation	23	20
Unfunded Plan | Pension Plan | SoCalGas
Defined Benefit Plan Disclosure [Line Items]
Projected benefit obligation	33	29
Accumulated benefit obligation	28	25
Unfunded Plan | Other Postretirement Benefits Plan
Defined Benefit Plan Disclosure [Line Items]
Accumulated benefit obligation	$ 9	$ 10