INCOME TAXES - DEFERRED INCOME TAXES (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Deferred income tax assets:
Less: valuation allowances	$ 183	$ 174	$ 144
Deferred income taxes assets, noncurrent	151	136	155
Deferred income tax liabilities, noncurrent	3,477	2,871	2,577
Sempra
Deferred income tax liabilities:
Differences in financial and tax bases of fixed assets, investments and other assets	5,230	4,891	4,052
U.S. state and non-U.S. withholding tax on repatriation of foreign earnings	47	46	153
Regulatory balancing accounts	538	587	468
Right-of-use assets – operating leases	160	144	131
Property taxes	52	51	44
Other deferred income tax liabilities	50	40	93
Total deferred income tax liabilities	6,077	5,759	4,941
Deferred income tax assets:
Tax credits	1,135	1,161	1,136
Net operating losses	706	1,299	911
Postretirement benefits	30	162	200
Compensation-related items	164	169	161
Operating lease liabilities	140	125	131
Other deferred income tax assets	130	97	60
Bad debt allowance	33	35	4
State income taxes	21	20	8
Accrued expenses not yet deductible	575	130	52
Deferred income tax assets before valuation allowances	2,934	3,198	2,663
Less: valuation allowances	183	174	144
Total deferred income tax assets	2,751	3,024	2,519
Net deferred income tax liability	3,326	2,735	2,422
Deferred income taxes assets, noncurrent	151	136	155
Deferred income tax liabilities, noncurrent	3,477	2,871	2,577
San Diego Gas and Electric Company [Member]
Deferred income tax liabilities:
Differences in financial and tax bases of fixed assets, investments and other assets	1,970	1,833	1,735
Regulatory balancing accounts	323	224	141
Right-of-use assets – operating leases	52	28	32
Property taxes	35	34	30
Other deferred income tax liabilities	1	2	14
Total deferred income tax liabilities	2,381	2,121	1,952
Deferred income tax assets:
Tax credits	5	5	6
Postretirement benefits	0	14	37
Compensation-related items	12	12	6
Operating lease liabilities	52	28	32
Other deferred income tax assets	1	3	4
Bad debt allowance	16	18	3
State income taxes	4	8	7
Accrued expenses not yet deductible	16	14	9
Total deferred income tax assets	106	102	104
Net deferred income tax liability	2,275	2,019	1,848
Deferred income tax liabilities, noncurrent	2,275	2,019	1,848
SoCalGas
Deferred income tax liabilities:
Differences in financial and tax bases of fixed assets, investments and other assets	1,444	1,322	1,246
Regulatory balancing accounts	215	362	327
Right-of-use assets – operating leases	16	21	22
Property taxes	17	17	14
Other deferred income tax liabilities	1	1	1
Total deferred income tax liabilities	1,693	1,723	1,610
Deferred income tax assets:
Tax credits	3	3	3
Postretirement benefits	18	123	120
Compensation-related items	33	36	25
Operating lease liabilities	16	21	22
Other deferred income tax assets	18	15	13
Bad debt allowance	15	15	1
State income taxes	12	11	8
Accrued expenses not yet deductible	539	93	15
Total deferred income tax assets	654	317	207
Net deferred income tax liability	1,039	1,406	1,403
Deferred income tax liabilities, noncurrent	$ 1,039	$ 1,406	$ 1,403