DEBT AND CREDIT FACILITIES - SHORT TERM DEBT DETAILS (Details)	1 Months Ended		12 Months Ended
	Nov. 30, 2021 USD ($) lender	Jun. 30, 2021 USD ($)	Dec. 31, 2021 USD ($) lender	Sep. 30, 2021 USD ($)
Line of Credit Facility [Line Items]
Total facility			$ 9,535,000,000
Number of lenders | lender			23
Lenders, percent of facility			6.00%
Line of credit			$ 749,000,000
Letters of credit outstanding			682,000,000
Foreign Line of Credit
Line of Credit Facility [Line Items]
Total facility			470,000,000
Line of credit			321,000,000
Foreign Unsecured Line of Credit
Line of Credit Facility [Line Items]
Total facility			470,000,000
Sempra Energy
Line of Credit Facility [Line Items]
Total facility			3,185,000,000
Committed lines of credit, capacity for issuance of letters of credit			200,000,000
Line of credit, increase limit			500,000,000
Line of credit			0
Sempra Energy | Sempra Energy Line Of Credit Due May 2024
Line of Credit Facility [Line Items]
Total facility			1,250,000,000
Line of credit			0
San Diego Gas and Electric Company [Member]
Line of Credit Facility [Line Items]
Total facility			1,500,000,000
Committed lines of credit, capacity for issuance of letters of credit			100,000,000
Line of credit, increase limit			250,000,000
Line of credit			0
San Diego Gas and Electric Company [Member] | Term Loan Due 2022 | Secured Debt [Member]
Line of Credit Facility [Line Items]
Variable percentage rate		0.625%
Debt amount		$ 375,000,000	375,000,000
SoCalGas
Line of Credit Facility [Line Items]
Total facility			750,000,000
Committed lines of credit, capacity for issuance of letters of credit			100,000,000
Line of credit, increase limit			250,000,000
Line of credit			$ 0
Sempra U.S.
Line of Credit Facility [Line Items]
Maximum ratio of indebtedness to total capitalization (as a percent)			65.00%
SI Partners
Line of Credit Facility [Line Items]
Total facility	$ 1,000,000,000		$ 1,000,000,000
Number of lenders | lender	12
Lenders, percent of facility	8.33%
Committed lines of credit, capacity for issuance of letters of credit	$ 200,000,000
Term of contract	3 years
Line of credit			0
Maximum adjustment EBITDA allowed	5.25
SI Partners | Swingline Sub-Limit
Line of Credit Facility [Line Items]
Line of credit	$ 100,000,000
IEnova | Foreign Line of Credit | Foreign Committed Lines of Credit, Due September 2021
Line of Credit Facility [Line Items]
Total facility			$ 350,000,000	$ 280,000,000
IEnova | Foreign Line of Credit | Foreign Committed Lines of Credit, Due September 2021 | LIBOR
Line of Credit Facility [Line Items]
Variable percentage rate			0.54%
IEnova | Foreign Line of Credit | Foreign Committed Lines of Credit, Due February 2024
Line of Credit Facility [Line Items]
Total facility			$ 1,500,000,000
Number of lenders | lender			10
IEnova | Foreign Line of Credit | Foreign Committed Lines of Credit, Due February 2024 | LIBOR
Line of Credit Facility [Line Items]
Variable percentage rate			0.80%