DEBT AND CREDIT FACILITIES - SCHEDULE OF LONG-TERM DEBT INSTRUMENTS (Details) - USD ($) $ in Millions	Dec. 31, 2021	Nov. 30, 2021	Dec. 31, 2020	Dec. 31, 2019
Debt Instrument [Line Items]
Long-term lease liabilities	$ 1,292		$ 1,294	$ 1,263
Finance lease obligations	1,335		1,330	1,289
Current portion of long-term debt	(106)		(1,540)	(1,526)
Long-term debt and finance leases	21,068		21,781	20,785
San Diego Gas and Electric Company [Member]
Debt Instrument [Line Items]
Gross long-term debt	6,417		6,053	5,140
Long-term lease liabilities	1,242		1,250	1,250
Long term debt and lease obligations, including current maturities	7,691		7,529	6,410
Finance lease obligations	1,274		1,276	1,270
Current portion of long-term debt	(49)		(611)	(56)
Unamortized discount on long-term debt	(17)		(13)	(12)
Unamortized debt issuance costs	(44)		(39)	(36)
Total debt and lease obligations	7,581		6,866	6,306
Long-term debt and finance leases	7,581		$ 6,866	6,306
San Diego Gas and Electric Company [Member] | 3% August 15, 2021
Debt Instrument [Line Items]
Stated percentage rate			3.00%
Gross long-term debt	$ 0		$ 350	350
San Diego Gas and Electric Company [Member] | 1.914% payable 2015 through February 2022
Debt Instrument [Line Items]
Stated percentage rate	1.914%
Gross long-term debt	$ 17		53	89
San Diego Gas and Electric Company [Member] | 3.6% September 1, 2023
Debt Instrument [Line Items]
Stated percentage rate	3.60%
Gross long-term debt	$ 450		450	450
San Diego Gas and Electric Company [Member] | 2.5% May 15, 2026
Debt Instrument [Line Items]
Stated percentage rate	2.50%
Gross long-term debt	$ 500		500	500
San Diego Gas and Electric Company [Member] | First Mortgage Bonds Due June 2026
Debt Instrument [Line Items]
Stated percentage rate	6.00%
Gross long-term debt	$ 250		250	250
San Diego Gas and Electric Company [Member] | 1.7% October 1, 2030
Debt Instrument [Line Items]
Stated percentage rate	1.70%
Gross long-term debt	$ 800		800	$ 0
San Diego Gas and Electric Company [Member] | 5.875% January and February 2034(1)
Debt Instrument [Line Items]
Stated percentage rate				5.875%
Gross long-term debt	$ 0		0	$ 176
San Diego Gas and Electric Company [Member] | 5.35% May 15, 2035
Debt Instrument [Line Items]
Stated percentage rate	5.35%
Gross long-term debt	$ 250		250	250
San Diego Gas and Electric Company [Member] | 6.125% September 15, 2037
Debt Instrument [Line Items]
Stated percentage rate	6.125%
Gross long-term debt	$ 250		250	$ 250
San Diego Gas and Electric Company [Member] | 4% May 1, 2039(1)
Debt Instrument [Line Items]
Stated percentage rate				4.00%
Gross long-term debt	$ 0		0	$ 75
San Diego Gas and Electric Company [Member] | 6% June 1, 2039
Debt Instrument [Line Items]
Stated percentage rate	6.00%
Gross long-term debt	$ 300		300	300
San Diego Gas and Electric Company [Member] | 5.35% May 15, 2040
Debt Instrument [Line Items]
Stated percentage rate	5.35%
Gross long-term debt	$ 250		250	250
San Diego Gas and Electric Company [Member] | 4.5% August 15, 2040
Debt Instrument [Line Items]
Stated percentage rate	4.50%
Gross long-term debt	$ 500		500	500
San Diego Gas and Electric Company [Member] | 3.95% November 15, 2041
Debt Instrument [Line Items]
Stated percentage rate	3.95%
Gross long-term debt	$ 250		250	250
San Diego Gas and Electric Company [Member] | 4.3% April 1, 2042
Debt Instrument [Line Items]
Stated percentage rate	4.30%
Gross long-term debt	$ 250		250	250
San Diego Gas and Electric Company [Member] | 3.75% June 1, 2047
Debt Instrument [Line Items]
Stated percentage rate	3.75%
Gross long-term debt	$ 400		400	400
San Diego Gas and Electric Company [Member] | 4.15% May 15, 2048
Debt Instrument [Line Items]
Stated percentage rate	4.15%
Gross long-term debt	$ 400		400	400
San Diego Gas and Electric Company [Member] | 4.1% June 15, 2049
Debt Instrument [Line Items]
Stated percentage rate	4.10%
Gross long-term debt	$ 400		400	400
San Diego Gas and Electric Company [Member] | 3.32% April 15, 2050
Debt Instrument [Line Items]
Stated percentage rate	3.32%
Gross long-term debt	$ 400		400	0
San Diego Gas and Electric Company [Member] | 2.95% August 15, 2051
Debt Instrument [Line Items]
Stated percentage rate	2.95%
Gross long-term debt	$ 750		0	0
San Diego Gas and Electric Company [Member] | Purchased-power contracts
Debt Instrument [Line Items]
Long-term lease liabilities	1,217		1,237	1,255
San Diego Gas and Electric Company [Member] | Other
Debt Instrument [Line Items]
Long-term lease liabilities	57		39	15
San Diego Gas and Electric Company [Member] | Other Long-term Debt
Debt Instrument [Line Items]
Long term debt and lease obligations, including current maturities	1,274		$ 1,476	1,270
San Diego Gas and Electric Company [Member] | Other Long Term Debt, Variable Rate Notes Due March 2021 [Member]
Debt Instrument [Line Items]
Stated percentage rate			0.95%
Gross long-term debt	0		$ 200	0
SoCalGas
Debt Instrument [Line Items]
Gross long-term debt	4,450		4,450	3,800
Long-term lease liabilities	50		44	13
Long term debt and lease obligations, including current maturities	4,820		4,813	3,828
Finance lease obligations	61		54	19
Finance lease obligations and other long term debt	370		363	28
Current portion of long-term debt	(11)		(10)	(6)
Unamortized discount on long-term debt	(7)		(8)	(7)
Unamortized debt issuance costs	(29)		(32)	(27)
Total debt and lease obligations	4,773		4,763	3,788
Long-term debt and finance leases	$ 4,773		4,763	3,788
SoCalGas | First Mortgage Bonds Due June 2026
Debt Instrument [Line Items]
Stated percentage rate	2.60%
Gross long-term debt	$ 500		500	500
SoCalGas | 3.15% September 15, 2024
Debt Instrument [Line Items]
Stated percentage rate	3.15%
Gross long-term debt	$ 500		500	500
SoCalGas | 3.2% June 15, 2025
Debt Instrument [Line Items]
Stated percentage rate	3.20%
Gross long-term debt	$ 350		350	350
SoCalGas | 2.55% February 1, 2030
Debt Instrument [Line Items]
Stated percentage rate	2.55%
Gross long-term debt	$ 650		650	0
SoCalGas | 5.75% November 15, 2035
Debt Instrument [Line Items]
Stated percentage rate	5.75%
Gross long-term debt	$ 250		250	250
SoCalGas | 5.125% November 15, 2040
Debt Instrument [Line Items]
Stated percentage rate	5.125%
Gross long-term debt	$ 300		300	300
SoCalGas | 3.75% September 15, 2042
Debt Instrument [Line Items]
Stated percentage rate	3.75%
Gross long-term debt	$ 350		350	350
SoCalGas | 4.45% March 15, 2044
Debt Instrument [Line Items]
Stated percentage rate	4.45%
Gross long-term debt	$ 250		250	250
SoCalGas | 4.125% June 1, 2048
Debt Instrument [Line Items]
Stated percentage rate	4.125%
Gross long-term debt	$ 400		400	400
SoCalGas | 4.3% January 15, 2049
Debt Instrument [Line Items]
Stated percentage rate	4.30%
Gross long-term debt	$ 550		550	550
SoCalGas | 3.95% February 15, 2050
Debt Instrument [Line Items]
Stated percentage rate	3.95%
Gross long-term debt	$ 350		350	350
SoCalGas | Notes at variable rates (0.55% at December 31, 2021) September 14, 2023(1)
Debt Instrument [Line Items]
Stated percentage rate	0.55%
Gross long-term debt	$ 300		300	0
SoCalGas | 1.875% Notes May 14, 2026(1)
Debt Instrument [Line Items]
Stated percentage rate	1.875%
Gross long-term debt	$ 4		4	4
SoCalGas | 5.67% Notes January 18, 2028(2)
Debt Instrument [Line Items]
Stated percentage rate	5.67%
Gross long-term debt	$ 5		5	$ 5
Sempra Energy | 2.4% Notes February 1, 2020
Debt Instrument [Line Items]
Stated percentage rate				2.40%
Gross long-term debt	0		0	$ 500
Sempra Energy | 2.4% Notes March 15, 2020
Debt Instrument [Line Items]
Stated percentage rate				2.40%
Gross long-term debt	0		0	$ 500
Sempra Energy | 2.85% Notes November 15, 2020
Debt Instrument [Line Items]
Stated percentage rate				2.85%
Gross long-term debt	0		0	$ 400
Sempra Energy | Notes at variable rates (2.50% at December 31, 2019) January 15, 2021(1)
Debt Instrument [Line Items]
Gross long-term debt	0		0	700
Sempra Energy | Other Long Term Debt, Variable Rate Notes Due March 2021 [Member]
Debt Instrument [Line Items]
Gross long-term debt	0		$ 850	850
Fixed interest rate after floating to fixed interest rate swaps			3.069%
Sempra Energy | 2.875% Notes October 1, 2022
Debt Instrument [Line Items]
Stated percentage rate			2.875%
Gross long-term debt	0		$ 500	500
Sempra Energy | 2.9% Notes February 1, 2023
Debt Instrument [Line Items]
Stated percentage rate			2.90%
Gross long-term debt	0		$ 500	500
Sempra Energy | 4.05% Notes December 1, 2023
Debt Instrument [Line Items]
Stated percentage rate			4.05%
Gross long-term debt	0		$ 500	500
Sempra Energy | 3.55% Notes June 15, 2024
Debt Instrument [Line Items]
Stated percentage rate			3.55%
Gross long-term debt	0		$ 500	500
Sempra Energy | 3.75% Notes November 15, 2025
Debt Instrument [Line Items]
Stated percentage rate			3.75%
Gross long-term debt	$ 0		$ 350	350
Sempra Energy | 3.25% Notes June 15, 2027
Debt Instrument [Line Items]
Stated percentage rate	3.25%
Gross long-term debt	$ 750		750	750
Sempra Energy | 3.4% Notes February 1, 2028
Debt Instrument [Line Items]
Stated percentage rate	3.40%
Gross long-term debt	$ 1,000		1,000	1,000
Sempra Energy | 3.8% Notes February 1, 2038
Debt Instrument [Line Items]
Stated percentage rate	3.80%
Gross long-term debt	$ 1,000		1,000	1,000
Sempra Energy | 6% Notes October 15, 2039
Debt Instrument [Line Items]
Stated percentage rate	6.00%
Gross long-term debt	$ 750		750	750
Sempra Energy | 4% Notes February 1, 2048
Debt Instrument [Line Items]
Stated percentage rate	4.00%
Gross long-term debt	$ 800		800	800
Sempra Energy | 4.125% Junior Subordinated Notes April 1, 2052(1)
Debt Instrument [Line Items]
Stated percentage rate	4.125%	4.125%
Gross long-term debt	$ 1,000		0	0
Sempra Energy | 5.75% Junior Subordinated Notes July 1, 2079(1)
Debt Instrument [Line Items]
Stated percentage rate	5.75%
Gross long-term debt	$ 758		758	758
Sempra Infrastructure
Debt Instrument [Line Items]
Gross long-term debt	$ 8,923		11,247	12,298
Sempra Infrastructure | 6.3% Notes February 2, 2023 (4.124% after cross-currency swap effective 2013)
Debt Instrument [Line Items]
Stated percentage rate	6.30%
Gross long-term debt	$ 189		197	207
Fixed interest rate after floating to fixed interest rate swaps	4.124%
Sempra Infrastructure | Loan at variable rates (2.93% at December 31, 2021) December 9, 2025
Debt Instrument [Line Items]
Stated percentage rate	2.93%
Gross long-term debt	$ 341		17	0
Sempra Infrastructure | Notes at 2.87% to 3.51% October 1, 2026(1)
Debt Instrument [Line Items]
Gross long-term debt	0		0	$ 22
Sempra Infrastructure | Notes at 2.87% to 3.51% October 1, 2026(1) | Minimum
Debt Instrument [Line Items]
Stated percentage rate				2.87%
Sempra Infrastructure | Notes at 2.87% to 3.51% October 1, 2026(1) | Maximum
Debt Instrument [Line Items]
Stated percentage rate				3.51%
Sempra Infrastructure | Notes at variable rates (5.13% after floating-to-fixed rate swaps effective 2014), payable 2016 through December 2026, collateralized by plant assets(2)
Debt Instrument [Line Items]
Gross long-term debt	$ 154		196	$ 237
Fixed interest rate after floating to fixed interest rate swaps	5.13%
Sempra Infrastructure | 3.75% Notes January 14, 2028
Debt Instrument [Line Items]
Stated percentage rate	3.75%
Gross long-term debt	$ 300		300	300
Sempra Infrastructure | Bank loans including $234 at a weighted-average fixed rate of 6.87%, $130 at variable rates (weighted-average rate of 6.54% after floating-to-fixed rate swaps effective 2014) and $34 at variable rates (3.45% at December 31, 2020), payable 2016 through March 2032, collateralized by plant assets
Debt Instrument [Line Items]
Gross long-term debt	0		$ 398	423
Sempra Infrastructure | Bank loans including $234 at a weighted-average fixed rate of 6.87%, $130 at variable rates (weighted-average rate of 6.54% after floating-to-fixed rate swaps effective 2014) and $34 at variable rates (3.45% at December 31, 2020), payable 2016 through March 2032, collateralized by plant assets | Weighted Average
Debt Instrument [Line Items]
Stated percentage rate			6.87%
Gross long-term debt			$ 234
Sempra Infrastructure | Loan at variable rates (5.75% at December 31, 2019) July 31, 2028(1)
Debt Instrument [Line Items]
Gross long-term debt	0		0	11
Sempra Infrastructure | Other Long-term Debt, Variable Rate Payable Through November 2034
Debt Instrument [Line Items]
Gross long-term debt	$ 200		200	200
Fixed interest rate after floating to fixed interest rate swaps	4.0275%
Sempra Infrastructure | Other Long Term Debt 2.9% Loan Due 2034
Debt Instrument [Line Items]
Gross long-term debt	$ 241		241	0
Sempra Infrastructure | Other Long-term Debt, Variable Rate Loan Due November 2034
Debt Instrument [Line Items]
Gross long-term debt	$ 100		100	0
Fixed interest rate after floating to fixed interest rate swaps	2.38%
Sempra Infrastructure | 4.875% Notes January 14, 2048
Debt Instrument [Line Items]
Stated percentage rate	4.875%
Gross long-term debt	$ 540		540	540
Sempra Infrastructure | Other Long-term Debt, 4.75% Notes Due September 2051
Debt Instrument [Line Items]
Stated percentage rate	4.75%
Gross long-term debt	$ 800		800	0
Other Sempra
Debt Instrument [Line Items]
Current portion of long-term debt	(46)		(919)	(1,464)
Unamortized discount on long-term debt	(65)		(55)	(35)
Unamortized debt issuance costs	(98)		(121)	(108)
Long-term debt and finance leases	$ 8,714		$ 10,152	$ 10,691
LIBOR | Sempra Energy | Notes at variable rates (2.50% at December 31, 2019) January 15, 2021(1)
Debt Instrument [Line Items]
Stated percentage rate				2.50%
LIBOR | Sempra Infrastructure | Bank loans including $234 at a weighted-average fixed rate of 6.87%, $130 at variable rates (weighted-average rate of 6.54% after floating-to-fixed rate swaps effective 2014) and $34 at variable rates (3.45% at December 31, 2020), payable 2016 through March 2032, collateralized by plant assets
Debt Instrument [Line Items]
Stated percentage rate			3.45%
Gross long-term debt			$ 34
LIBOR | Sempra Infrastructure | Bank loans including $234 at a weighted-average fixed rate of 6.87%, $130 at variable rates (weighted-average rate of 6.54% after floating-to-fixed rate swaps effective 2014) and $34 at variable rates (3.45% at December 31, 2020), payable 2016 through March 2032, collateralized by plant assets | Weighted Average
Debt Instrument [Line Items]
Gross long-term debt			$ 130
Fixed interest rate after floating to fixed interest rate swaps			6.54%
LIBOR | Sempra Infrastructure | Loan at variable rates (5.75% at December 31, 2019) July 31, 2028(1)
Debt Instrument [Line Items]
Stated percentage rate				5.75%