EMPLOYEE BENEFIT PLANS - PROJECTED BENEFIT OBLIGATION, FAIR VALUE OF ASSETS AND FUNDED STATUS (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Pension Plan
CHANGE IN PROJECTED BENEFIT OBLIGATION
Net obligation at January 1	$ 3,857	$ 4,077
Service cost	146	145	$ 129
Interest cost	118	112	129
Contributions from plan participants	0	0
Actuarial gain	(925)	(76)
Benefit payments	(89)	(98)
Settlements	(301)	(303)
Net obligation at December 31	2,806	3,857	4,077
CHANGE IN PLAN ASSETS
Fair value of plan assets at January 1	3,182	3,002
Actual return on plan assets	(625)	340
Employer contributions	223	241
Contributions from plan participants	0	0
Benefit payments	(89)	(98)
Settlements	(301)	(303)
Fair value of plan assets at December 31	2,390	3,182	3,002
Defined Benefit Plan, Funded (Unfunded) Status of Plan [Abstract]
Funded status at December 31	(416)	(675)
Net recorded (liability) asset at December 31	(416)	(675)
Accumulated benefit obligation	2,574	3,419
Pension Plan \| San Diego Gas and Electric Company
CHANGE IN PROJECTED BENEFIT OBLIGATION
Net obligation at January 1	885	913
Service cost	37	35	31
Interest cost	26	25	30
Contributions from plan participants	0	0
Actuarial gain	(135)	(2)
Benefit payments	(17)	(17)
Settlements	(82)	(69)
Net obligation at December 31	714	885	913
CHANGE IN PLAN ASSETS
Fair value of plan assets at January 1	859	819
Actual return on plan assets	(142)	73
Employer contributions	52	53
Contributions from plan participants	0	0
Benefit payments	(17)	(17)
Settlements	(82)	(69)
Fair value of plan assets at December 31	670	859	819
Defined Benefit Plan, Funded (Unfunded) Status of Plan [Abstract]
Funded status at December 31	(44)	(26)
Net recorded (liability) asset at December 31	(44)	(26)
Accumulated benefit obligation	678	824
Pension Plan \| SoCalGas
CHANGE IN PROJECTED BENEFIT OBLIGATION
Net obligation at January 1	2,647	2,829
Service cost	96	97	86
Interest cost	81	78	88
Contributions from plan participants	0	0
Actuarial gain	(748)	(83)
Benefit payments	(58)	(63)
Settlements	(204)	(211)
Net obligation at December 31	1,814	2,647	2,829
CHANGE IN PLAN ASSETS
Fair value of plan assets at January 1	2,095	1,969
Actual return on plan assets	(449)	243
Employer contributions	151	157
Contributions from plan participants	0	0
Benefit payments	(58)	(63)
Settlements	(204)	(211)
Fair value of plan assets at December 31	1,535	2,095	1,969
Defined Benefit Plan, Funded (Unfunded) Status of Plan [Abstract]
Funded status at December 31	(279)	(552)
Net recorded (liability) asset at December 31	(279)	(552)
Accumulated benefit obligation	1,644	2,306
Other Postretirement Benefits Plan
CHANGE IN PROJECTED BENEFIT OBLIGATION
Net obligation at January 1	940	989
Service cost	23	23	18
Interest cost	28	28	33
Contributions from plan participants	23	21
Actuarial gain	(282)	(53)
Benefit payments	(69)	(68)
Settlements	0	0
Net obligation at December 31	663	940	989
CHANGE IN PLAN ASSETS
Fair value of plan assets at January 1	1,408	1,399
Actual return on plan assets	(271)	51
Employer contributions	5	5
Contributions from plan participants	23	21
Benefit payments	(69)	(68)
Settlements	0	0
Fair value of plan assets at December 31	1,096	1,408	1,399
Defined Benefit Plan, Funded (Unfunded) Status of Plan [Abstract]
Funded status at December 31	433	468
Net recorded (liability) asset at December 31	433	468
Other Postretirement Benefits Plan \| San Diego Gas and Electric Company
CHANGE IN PROJECTED BENEFIT OBLIGATION
Net obligation at January 1	188	193
Service cost	5	5	4
Interest cost	6	5	6
Contributions from plan participants	8	7
Actuarial gain	(54)	(3)
Benefit payments	(19)	(19)
Settlements	0	0
Net obligation at December 31	134	188	193
CHANGE IN PLAN ASSETS
Fair value of plan assets at January 1	197	213
Actual return on plan assets	(40)	(5)
Employer contributions	1	1
Contributions from plan participants	8	7
Benefit payments	(19)	(19)
Settlements	0	0
Fair value of plan assets at December 31	147	197	213
Defined Benefit Plan, Funded (Unfunded) Status of Plan [Abstract]
Funded status at December 31	13	9
Net recorded (liability) asset at December 31	13	9
Other Postretirement Benefits Plan \| SoCalGas
CHANGE IN PROJECTED BENEFIT OBLIGATION
Net obligation at January 1	706	749
Service cost	17	17	14
Interest cost	21	22	25
Contributions from plan participants	14	13
Actuarial gain	(215)	(49)
Benefit payments	(46)	(46)
Settlements	0	0
Net obligation at December 31	497	706	749
CHANGE IN PLAN ASSETS
Fair value of plan assets at January 1	1,178	1,159
Actual return on plan assets	(224)	51
Employer contributions	1	1
Contributions from plan participants	14	13
Benefit payments	(46)	(46)
Settlements	0	0
Fair value of plan assets at December 31	923	1,178	$ 1,159
Defined Benefit Plan, Funded (Unfunded) Status of Plan [Abstract]
Funded status at December 31	426	472
Net recorded (liability) asset at December 31	$ 426	$ 472

Amount of actuarial present value of benefits attributed to employee service rendered, excluding assumptions about future compensation level.

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Amount of increase (decrease) in plan assets of defined benefit plan from actual return (loss) determined by change in fair value of plan assets adjusted for contributions, benefit payments, and other expenses.

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Amount of gain (loss) from change in actuarial assumptions which (increases) decreases benefit obligation of defined benefit plan. Assumptions include, but are not limited to, interest, mortality, employee turnover, salary, and temporary deviation from substantive plan.

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Amount of asset (liability), recognized in statement of financial position, for defined benefit pension and other postretirement plans.

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Amount of actuarial present value of benefits attributed to service rendered by employee for defined benefit plan.

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Amount of payment to participant of defined benefit plan which decreases benefit obligation. For pension plan, payment includes, but is not limited to, pension benefits and death benefits. For other postretirement plan, payment includes, but is not limited to, prescription drug benefits, health care benefits, life insurance benefits, and legal, educational and advisory services.

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Amount of contributions received by defined benefit plan from participant which increase benefit obligation.

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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Amount of contribution received by defined benefit plan from employer which increases plan assets.

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Amount of asset segregated and restricted to provide benefit under defined benefit plan. Asset includes, but is not limited to, stock, bond, other investment, earning from investment, and contribution by employer and employee.

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Amount of funded (unfunded) status of defined benefit plan, measured as difference between fair value of plan assets and benefit obligation. Includes, but is not limited to, overfunded (underfunded) status.

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Amount of cost recognized for passage of time related to defined benefit plan.

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Amount of payment to participant under defined benefit plan which decreases plan assets. For pension plan, payment includes, but is not limited to, pension benefits and death benefits. For other postretirement plan, payment includes, but is not limited to, prescription drug benefits, health care benefits, life insurance benefits, and legal, educational and advisory services.

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Amount of contributions received by defined benefit plan from participant which increases plan assets.

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Amount of cost for actuarial present value of benefits attributed to service rendered by employee for defined benefit plan.

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Amount of (increase) decrease to benefit obligation of defined benefit plan from irrevocable action relieving primary responsibility for benefit obligation and eliminating risk for obligation and assets used to effect settlement. Includes, but is not limited to, lump-sum cash payment to participant in exchange for right to receive specified benefits, purchase of nonparticipating annuity contract and change from remeasurement.

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Amount of payment, which decreases plan assets of defined benefit plan, for irrevocable action relieving primary responsibility for benefit obligation and eliminating risk for obligation and assets used to effect settlement. Transaction constituting settlement includes, but is not limited to, making lump-sum cash payment to participant in exchange for their rights to receive specified benefits and purchasing nonparticipating annuity contract.

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