COMMITMENTS AND CONTINGENCIES - LEASES BALANCE SHEET INFORMATION (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Lessee, Lease, Description [Line Items]
Right-of-use assets – operating leases	$ 594	$ 543	$ 591
Finance leases, property plant and equipment	1,473	1,429	1,353
Finance leases, accumulated depreciation	$ (138)	$ (99)	$ (64)
Finance Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration]	Property, plant and equipment, net	Property, plant and equipment, net	Property, plant and equipment, net
Finance leases, property plant and equipment, net	$ 1,335	$ 1,330	$ 1,289
Lease, Right-of-Use Asset	$ 1,929	$ 1,873	$ 1,880
Operating Lease, Liability, Current, Statement of Financial Position [Extensible List]	Other current liabilities	Other current liabilities	Other current liabilities
Operating lease, other current liabilities	$ 49	$ 52	$ 52
Operating Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List]	Deferred credits and other	Deferred credits and other	Deferred credits and other
Operating lease, deferred credits and other	$ 470	$ 407	$ 445
Total lease liabilities	$ 519	$ 459	$ 497
Finance Lease, Liability, Current, Statement of Financial Position [Extensible Enumeration]	Current portion of long-term debt and finance leases	Current portion of long-term debt and finance leases	Current portion of long-term debt and finance leases
Finance lease, current portion of long-term debt and finance leases	$ 43	$ 36	$ 26
Finance Lease, Liability, Noncurrent, Statement of Financial Position [Extensible Enumeration]	Long-term debt	Long-term debt	Long-term debt
Long-term lease liabilities	$ 1,292	$ 1,294	$ 1,263
Total finance leases	1,335	1,330	1,289
Lease liabilities	$ 1,854	$ 1,789	$ 1,786
Operating lease, weighted-average remaining lease term	14 years	13 years	13 years
Finance lease, weighted-average remaining lease term	17 years	18 years	19 years
Operating lease, weighted-average discount rate (as a percent)	5.45%	5.81%	6.01%
Finance lease, weighted-average discount rate (as a percent)	14.25%	14.45%	14.76%
SDG&E
Lessee, Lease, Description [Line Items]
Variable payments, due in 2022	$ 297
Variable payments, due in 2023	296
Variable payments, due in 2024	297
Variable payments, due in 2025	296
Variable payments, due in 2026	290
Variable payments, due thereafter	2,779
San Diego Gas and Electric Company [Member]
Lessee, Lease, Description [Line Items]
Right-of-use assets – operating leases	185	$ 102	$ 130
Finance leases, property plant and equipment	1,381	1,356	1,326
Finance leases, accumulated depreciation	(107)	(80)	(57)
Finance leases, property plant and equipment, net	1,274	1,276	1,269
Lease, Right-of-Use Asset	1,459	1,378	1,399
Operating lease, other current liabilities	26	27	27
Operating lease, deferred credits and other	159	73	102
Total lease liabilities	185	100	129
Finance lease, current portion of long-term debt and finance leases	32	26	20
Long-term lease liabilities	1,242	1,250	1,250
Total finance leases	1,274	1,276	1,270
Lease liabilities	$ 1,459	$ 1,376	$ 1,399
Operating lease, weighted-average remaining lease term	11 years	6 years	6 years
Finance lease, weighted-average remaining lease term	17 years	19 years	20 years
Operating lease, weighted-average discount rate (as a percent)	3.22%	3.62%	3.55%
Finance lease, weighted-average discount rate (as a percent)	14.48%	14.65%	14.83%
SoCalGas
Lessee, Lease, Description [Line Items]
Right-of-use assets – operating leases	$ 57	$ 74	$ 94
Finance leases, property plant and equipment	92	73	27
Finance leases, accumulated depreciation	(31)	(19)	(7)
Finance leases, property plant and equipment, net	61	54	20
Lease, Right-of-Use Asset	118	128	114
Operating lease, other current liabilities	15	18	18
Operating lease, deferred credits and other	41	56	75
Total lease liabilities	56	74	93
Finance lease, current portion of long-term debt and finance leases	11	10	6
Long-term lease liabilities	50	44	13
Total finance leases	61	54	19
Lease liabilities	$ 117	$ 128	$ 112
Operating lease, weighted-average remaining lease term	4 years	5 years	6 years
Finance lease, weighted-average remaining lease term	7 years	7 years	6 years
Operating lease, weighted-average discount rate (as a percent)	1.98%	2.03%	3.73%
Finance lease, weighted-average discount rate (as a percent)	2.91%	2.83%	3.23%
Maximum
Lessee, Lease, Description [Line Items]
Operating lease renewal period	20 years
Annual increase in rent, percent	5.00%
Minimum
Lessee, Lease, Description [Line Items]
Operating lease termination period	1 year
Annual increase in rent, percent	2.00%