EMPLOYEE BENEFIT PLANS - PROJECTED BENEFIT OBLIGATION, FAIR VALUE OF ASSETS AND FUNDED STATUS (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
CHANGE IN PROJECTED BENEFIT OBLIGATION
Plan amendments	$ 4
Pension Plan
CHANGE IN PROJECTED BENEFIT OBLIGATION
Net obligation at January 1	2,806	$ 3,857
Service cost	109	146	$ 145
Interest cost	157	118	112
Contributions from plan participants	0	0
Actuarial loss (gain)	190	(925)
Plan amendments	4	0
Benefit payments	(83)	(89)
Settlements	(76)	(301)
Net obligation at December 31	3,107	2,806	3,857
CHANGE IN PLAN ASSETS
Fair value of plan assets at January 1	2,390	3,182
Actual return on plan assets	218	(625)
Employer contributions	215	223
Contributions from plan participants	0	0
Benefit payments	(83)	(89)
Settlements	(76)	(301)
Fair value of plan assets at December 31	2,664	2,390	3,182
Defined Benefit Plan, Funded (Unfunded) Status of Plan [Abstract]
Funded status at December 31	(443)	(416)
Net recorded (liability) asset at December 31	(443)	(416)
Accumulated benefit obligation	2,865	2,574
Pension Plan | SDG&E
CHANGE IN PROJECTED BENEFIT OBLIGATION
Net obligation at January 1	714	885
Service cost	32	37	35
Interest cost	40	26	25
Contributions from plan participants	0	0
Actuarial loss (gain)	69	(135)
Benefit payments	(17)	(17)
Settlements	(31)	(82)
Net obligation at December 31	807	714	885
CHANGE IN PLAN ASSETS
Fair value of plan assets at January 1	670	859
Actual return on plan assets	52	(142)
Employer contributions	52	52
Contributions from plan participants	0	0
Benefit payments	(17)	(17)
Settlements	(31)	(82)
Fair value of plan assets at December 31	726	670	859
Defined Benefit Plan, Funded (Unfunded) Status of Plan [Abstract]
Funded status at December 31	(81)	(44)
Net recorded (liability) asset at December 31	(81)	(44)
Accumulated benefit obligation	769	678
Pension Plan | SoCalGas
CHANGE IN PROJECTED BENEFIT OBLIGATION
Net obligation at January 1	1,814	2,647
Service cost	65	96	97
Interest cost	101	81	78
Contributions from plan participants	0	0
Actuarial loss (gain)	90	(748)
Benefit payments	(58)	(58)
Settlements	(35)	(204)
Net obligation at December 31	1,977	1,814	2,647
CHANGE IN PLAN ASSETS
Fair value of plan assets at January 1	1,535	2,095
Actual return on plan assets	151	(449)
Employer contributions	151	151
Contributions from plan participants	0	0
Benefit payments	(58)	(58)
Settlements	(35)	(204)
Fair value of plan assets at December 31	1,744	1,535	2,095
Defined Benefit Plan, Funded (Unfunded) Status of Plan [Abstract]
Funded status at December 31	(233)	(279)
Net recorded (liability) asset at December 31	(233)	(279)
Accumulated benefit obligation	1,799	1,644
Other Postretirement Benefits Plan
CHANGE IN PROJECTED BENEFIT OBLIGATION
Net obligation at January 1	663	940
Service cost	13	23	23
Interest cost	37	28	28
Contributions from plan participants	23	23
Actuarial loss (gain)	28	(282)
Plan amendments	0	0
Benefit payments	(71)	(69)
Settlements	0	0
Net obligation at December 31	693	663	940
CHANGE IN PLAN ASSETS
Fair value of plan assets at January 1	1,096	1,408
Actual return on plan assets	117	(271)
Employer contributions	4	5
Contributions from plan participants	23	23
Benefit payments	(71)	(69)
Settlements	0	0
Fair value of plan assets at December 31	1,169	1,096	1,408
Defined Benefit Plan, Funded (Unfunded) Status of Plan [Abstract]
Funded status at December 31	476	433
Net recorded (liability) asset at December 31	476	433
Other Postretirement Benefits Plan | SDG&E
CHANGE IN PROJECTED BENEFIT OBLIGATION
Net obligation at January 1	134	188
Service cost	3	5	5
Interest cost	8	6	5
Contributions from plan participants	8	8
Actuarial loss (gain)	7	(54)
Benefit payments	(20)	(19)
Settlements	0	0
Net obligation at December 31	140	134	188
CHANGE IN PLAN ASSETS
Fair value of plan assets at January 1	147	197
Actual return on plan assets	14	(40)
Employer contributions	1	1
Contributions from plan participants	8	8
Benefit payments	(20)	(19)
Settlements	0	0
Fair value of plan assets at December 31	150	147	197
Defined Benefit Plan, Funded (Unfunded) Status of Plan [Abstract]
Funded status at December 31	10	13
Net recorded (liability) asset at December 31	10	13
Other Postretirement Benefits Plan | SoCalGas
CHANGE IN PROJECTED BENEFIT OBLIGATION
Net obligation at January 1	497	706
Service cost	9	17	17
Interest cost	28	21	22
Contributions from plan participants	14	14
Actuarial loss (gain)	21	(215)
Benefit payments	(48)	(46)
Settlements	0	0
Net obligation at December 31	521	497	706
CHANGE IN PLAN ASSETS
Fair value of plan assets at January 1	923	1,178
Actual return on plan assets	100	(224)
Employer contributions	1	1
Contributions from plan participants	14	14
Benefit payments	(48)	(46)
Settlements	0	0
Fair value of plan assets at December 31	990	923	$ 1,178
Defined Benefit Plan, Funded (Unfunded) Status of Plan [Abstract]
Funded status at December 31	469	426
Net recorded (liability) asset at December 31	$ 469	$ 426