EMPLOYEE BENEFIT PLANS - NET PERIODIC BENEFIT COST AND AMOUNTS RECOGNIZED IN OCI (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Pension Plan
NET PERIODIC BENEFIT COST AND AMOUNTS RECOGNIZED IN OCI
Service cost	$ 146	$ 145	$ 129
Interest cost	118	112	129
Expected return on assets	(183)	(173)	(169)
Amortization of prior service cost (credit)	10	11	12
Amortization of actuarial loss (gain)	25	45	35
Settlement charges	28	38	22
Net periodic benefit cost (credit)	144	178	158
Regulatory adjustment	84	57	91
Total expense recognized	228	235	249
CHANGES IN PLAN ASSETS AND BENEFIT OBLIGATIONS RECOGNIZED IN OCI
Net loss (gain)	12	(5)	28
Amortization of actuarial loss	(8)	(8)	(14)
Amortization of prior service cost	(4)	(4)	(4)
Settlements	0	(7)	(22)
Total recognized in OCI	0	(24)	(12)
Total recognized in net periodic benefit cost and OCI	228	211	237
Pension Plan | San Diego Gas and Electric Company
NET PERIODIC BENEFIT COST AND AMOUNTS RECOGNIZED IN OCI
Service cost	37	35	31
Interest cost	26	25	30
Expected return on assets	(46)	(50)	(49)
Amortization of prior service cost (credit)	1	1	2
Amortization of actuarial loss (gain)	1	2	3
Settlement charges	14	6	0
Net periodic benefit cost (credit)	33	19	17
Regulatory adjustment	20	34	38
Total expense recognized	53	53	55
CHANGES IN PLAN ASSETS AND BENEFIT OBLIGATIONS RECOGNIZED IN OCI
Net loss (gain)	(3)	1	6
Transfer of actuarial loss	0	0	(7)
Transfer of prior service cost	0	0	(5)
Amortization of actuarial loss	(1)	0	(1)
Amortization of prior service cost	0	(1)	(1)
Total recognized in OCI	(4)	0	(8)
Total recognized in net periodic benefit cost and OCI	49	53	47
Pension Plan | SoCalGas
NET PERIODIC BENEFIT COST AND AMOUNTS RECOGNIZED IN OCI
Service cost	96	97	86
Interest cost	81	78	88
Expected return on assets	(126)	(113)	(107)
Amortization of prior service cost (credit)	8	8	8
Amortization of actuarial loss (gain)	18	36	26
Settlement charges	14	25	0
Net periodic benefit cost (credit)	91	131	101
Regulatory adjustment	64	23	53
Total expense recognized	155	154	154
CHANGES IN PLAN ASSETS AND BENEFIT OBLIGATIONS RECOGNIZED IN OCI
Net loss (gain)	(5)	2	6
Transfer of actuarial loss	0	0	5
Transfer of prior service cost	0	0	3
Amortization of actuarial loss	(2)	(1)	(1)
Amortization of prior service cost	(1)	(1)	(1)
Total recognized in OCI	(8)	0	12
Total recognized in net periodic benefit cost and OCI	147	154	166
Other Postretirement Benefits Plan
NET PERIODIC BENEFIT COST AND AMOUNTS RECOGNIZED IN OCI
Service cost	23	23	18
Interest cost	28	28	33
Expected return on assets	(64)	(61)	(55)
Amortization of prior service cost (credit)	(2)	(2)	(2)
Amortization of actuarial loss (gain)	(15)	(9)	(10)
Settlement charges	0	0	0
Net periodic benefit cost (credit)	(30)	(21)	(16)
Regulatory adjustment	30	21	16
Total expense recognized	0	0	0
CHANGES IN PLAN ASSETS AND BENEFIT OBLIGATIONS RECOGNIZED IN OCI
Net loss (gain)	(4)	(4)	1
Amortization of actuarial loss	1	0	0
Amortization of prior service cost	0	0	0
Settlements	0	0	0
Total recognized in OCI	(3)	(4)	1
Total recognized in net periodic benefit cost and OCI	(3)	(4)	1
Other Postretirement Benefits Plan | San Diego Gas and Electric Company
NET PERIODIC BENEFIT COST AND AMOUNTS RECOGNIZED IN OCI
Service cost	5	5	4
Interest cost	6	5	6
Expected return on assets	(10)	(10)	(10)
Amortization of prior service cost (credit)	0	0	0
Amortization of actuarial loss (gain)	(2)	(2)	(3)
Settlement charges	0	0	0
Net periodic benefit cost (credit)	(1)	(2)	(3)
Regulatory adjustment	1	2	3
Total expense recognized	0	0	0
Other Postretirement Benefits Plan | SoCalGas
NET PERIODIC BENEFIT COST AND AMOUNTS RECOGNIZED IN OCI
Service cost	17	17	14
Interest cost	21	22	25
Expected return on assets	(53)	(48)	(43)
Amortization of prior service cost (credit)	(2)	(3)	(2)
Amortization of actuarial loss (gain)	(12)	(7)	(7)
Settlement charges	0	0	0
Net periodic benefit cost (credit)	(29)	(19)	(13)
Regulatory adjustment	29	19	13
Total expense recognized	$ 0	$ 0	$ 0