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First mortgage bonds amount available for future issuance.

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Face (par) amount of debt instrument at time of issuance.

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Contractual interest rate for funds borrowed, under the debt agreement.

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Percentage price of original principal amount of debt at which debt can be redeemed by the issuer.

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Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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The interest rate applicable to the portion of the carrying amount of long-term borrowings outstanding as of the balance sheet date, including current maturities, which accrues interest at a set, unchanging rate.

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The cash inflow from additional borrowings, net of cash paid to third parties in connection with debt origination.

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The cash inflow during the period from additional borrowings in aggregate debt. Includes proceeds from short-term and long-term debt.

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Amount of cash outflow for payment of an obligation from a lender, including but not limited to, letter of credit, standby letter of credit and revolving credit arrangements.

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The cash outflow for debt initially having maturity due after one year or beyond the normal operating cycle, if longer.

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The cash outflow for the settlement of obligation drawn from a contractual arrangement with the lender, including letter of credit, standby letter of credit and revolving credit arrangements, under which borrowings can be made up to a specific amount at any point in time with maturities due beyond one year or the operating cycle, if longer.

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Percentage of subsidiary's or equity method investee's stock owned by parent immediately after all stock transactions.

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Including the current and noncurrent portions, carrying value as of the balance sheet date of uncollateralized debt obligations (with maturities initially due after one year or beyond the operating cycle if longer).

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DEBT AND CREDIT FACILITIES - NARRATIVE (Details)		1 Months Ended							2 Months Ended	3 Months Ended	12 Months Ended
DEBT AND CREDIT FACILITIES - NARRATIVE (Details)	Mar. 30, 2020 USD ($)	Dec. 31, 2020 USD ($) MMBbls	Oct. 31, 2020 USD ($)	Sep. 30, 2020 USD ($)	Jun. 30, 2020 USD ($)	Apr. 30, 2020 USD ($)	Mar. 31, 2020 USD ($)	Jan. 31, 2020 USD ($)	Apr. 30, 2020 USD ($)	Mar. 31, 2020 USD ($)	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)
Debt Instrument [Line Items]
Letters of credit outstanding		$ 508,000,000									$ 508,000,000
Unsecured debt		$ 11,200,000,000									11,200,000,000
Redemptions prior to maturity											5,864,000,000	$ 3,667,000,000	$ 3,342,000,000
Equitization of long-term debt for deficit held by NCI											$ (22,000,000)
Sempra Energy Consolidated [Member]
Debt Instrument [Line Items]
Weighted average interest rate on total short-term debt outstanding		0.83%									0.83%	2.31%
San Diego Gas and Electric Company [Member]
Debt Instrument [Line Items]
Weighted average interest rate on total short-term debt outstanding		0.00%									0.00%	1.97%
First mortgage bonds available for future issuance		$ 6,500,000,000									$ 6,500,000,000
Redemptions prior to maturity											510,000,000	$ 274,000,000	492,000,000
Total facility		$ 1,500,000,000									$ 1,500,000,000
San Diego Gas and Electric Company [Member] \| Term Loan [Member]
Debt Instrument [Line Items]
Proceeds from debt							$ 200,000,000
Basis spread on variable percentage rate	0.80%										0.95%
San Diego Gas and Electric Company [Member] \| Line of Credit [Member]
Debt Instrument [Line Items]
Repayments of Long-term Lines of Credit										$ 200,000,000
Southern California Gas Company [Member]
Debt Instrument [Line Items]
Weighted average interest rate on total short-term debt outstanding		0.14%									0.14%	1.86%
Unsecured debt		$ 309,000,000									$ 309,000,000
First mortgage bonds available for future issuance		1,200,000,000									1,200,000,000
Redemptions prior to maturity											12,000,000	$ 6,000,000	$ 500,000,000
Total facility		$ 750,000,000									$ 750,000,000
Southern California Gas Company [Member] \| First Mortgage Bonds, Due February 2030
Debt Instrument [Line Items]
Stated percentage rate		2.55%						2.55%			2.55%
Sempra Energy [Member]
Debt Instrument [Line Items]
Total facility		$ 1,250,000,000									$ 1,250,000,000
Sempra Energy [Member] \| Term Loan [Member]
Debt Instrument [Line Items]
Proceeds from debt									$ 1,599,000,000
Debt issuance costs						$ 1,000,000			1,000,000
Sempra Mexico [Member] \| IEnova Loan Agreement [Member] \| Japan International Cooperation Agency [Member]
Debt Instrument [Line Items]
Proceeds from debt						98,000,000
Debt issuance costs						2,000,000			$ 2,000,000
Proceeds from issuance of debt						$ 100,000,000
Fixed interest rate (as a percent)						2.38%			2.38%
Sempra Mexico [Member] \| IEnova Loan Agreement [Member] \| U.S. International Development Finance Corporation [Member]
Debt Instrument [Line Items]
Proceeds from debt					$ 236,000,000
Debt issuance costs					5,000,000
Proceeds from issuance of debt					$ 241,000,000
Fixed interest rate (as a percent)					2.90%
Sempra Mexico [Member] \| IEnova Loan Agreement [Member] \| LIBOR [Member] \| Japan International Cooperation Agency [Member]
Debt Instrument [Line Items]
Basis spread on variable percentage rate						1.50%
Sempra LNG [Member] \| Liberty Gas Storage, LLC [Member]
Debt Instrument [Line Items]
Equitization of long-term debt for deficit held by NCI	$ 22,000,000
Sempra LNG [Member] \| ECA LNG JV [Member]
Debt Instrument [Line Items]
Ownership percentage in consolidated entity		41.70%
Sempra LNG [Member] \| Loan Agreement To Finance Natural Gas Liquefaction Export Facility [Member]
Debt Instrument [Line Items]
Stated percentage rate		2.70%									2.70%
Term of contract		5 years
Total facility		$ 1,600,000,000									$ 1,600,000,000
Long-term debt outstanding		$ 17,000,000									$ 17,000,000
Name plate capacity (in Mtpa) \| MMBbls		3.25
Initial offtake capacity (in Mtpa) \| MMBbls		2.5
Subsidiary of TOTAL SE [Member] \| ECA LNG JV [Member]
Debt Instrument [Line Items]
Ownership percentage in consolidated entity		16.60%
IEnova [Member] \| ECA LNG JV [Member]
Debt Instrument [Line Items]
Ownership percentage in consolidated entity		41.70%
Bonds [Member] \| San Diego Gas and Electric Company [Member] \| First Mortgage Bonds Due June 2049 [Member]
Debt Instrument [Line Items]
Proceeds from debt				$ 792,000,000
Debt issuance costs				8,000,000
Debt amount				$ 800,000,000
Stated percentage rate				1.70%
Bonds [Member] \| San Diego Gas and Electric Company [Member] \| First Mortgage Bonds, Due June 2050 [Member]
Debt Instrument [Line Items]
Proceeds from debt						$ 395,000,000
Debt issuance costs						5,000,000			$ 5,000,000
Debt amount						$ 400,000,000			$ 400,000,000
Stated percentage rate						3.32%			3.32%
Repayments of lines of credit						$ 200,000,000
Bonds [Member] \| Southern California Gas Company [Member] \| First Mortgage Bonds, Due June 2050 [Member]
Debt Instrument [Line Items]
Proceeds from debt				$ 298,000,000
Debt issuance costs				2,000,000
Debt amount				300,000,000
Bonds [Member] \| Southern California Gas Company [Member] \| First Mortgage Bonds, Due February 2030
Debt Instrument [Line Items]
Proceeds from debt								$ 643,000,000
Debt issuance costs								7,000,000
Debt amount								$ 650,000,000
Bonds [Member] \| Prior To Maturity In 2034 [Member] \| San Diego Gas and Electric Company [Member]
Debt Instrument [Line Items]
Redemptions prior to maturity		$ 176,000,000
Bonds [Member] \| Prior To Maturity In 2039 [Member] \| San Diego Gas and Electric Company [Member]
Debt Instrument [Line Items]
Redemptions prior to maturity		$ 75,000,000
Junior Subordinated Debt [Member] \| Sempra Mexico [Member] \| Junior Subordinated Notes Due 2079 [Member]
Debt Instrument [Line Items]
Debt amount				$ 800,000,000
Stated percentage rate				4.75%
Unsecured Debt [Member] \| Southern California Gas Company [Member] \| Senior Unsecured Notes Maturing 2023 [Member]
Debt Instrument [Line Items]
Debt instrument, redemption price (as a percent)				100.00%
Unsecured Debt [Member] \| Southern California Gas Company [Member] \| Senior Unsecured Notes Maturing 2023 [Member] \| LIBOR [Member]
Debt Instrument [Line Items]
Basis spread on variable percentage rate				0.35%
Unsecured Debt [Member] \| Sempra Mexico [Member] \| Four Point Seven Five Percent Senior Unsecured Notes Maturing 2051 [Member]
Debt Instrument [Line Items]
Proceeds from debt				$ 770,000,000
Debt issuance costs				$ 30,000,000
Sempra Energy Consolidated [Member] \| Prior to maturity in 2021
Debt Instrument [Line Items]
Redemptions prior to maturity			$ 700,000,000