SHARE-BASED COMPENSATION - SHARE-BASED COMPENSATION EXPENSE/ OPTIONS (Details) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Number of shares available for future grants (in shares)	7,662,352
Number of shares authorized for issuance (in shares)	7,662,352
Share-based compensation expense, before income taxes	$ 66	$ 76	$ 78
Income tax benefit	(18)	(21)	(31)
Capitalized share-based compensation cost	11	10	9
Excess income tax deficiency	4	15	0
Share-based compensation expense, net of taxes	$ 48	$ 55	$ 47
Stock option exercise period (in years)	3 years
Weighted-average fair value for options granted (in dollars per share)	$ 13.20
Stock price volatility (as a percent)	18.63%
Expected term (in years)	5 years 4 months 2 days
Risk-free rate of return (as a percent)	2.49%
Annual dividend yield (as a percent)	3.35%
Common shares under options
Beginning balance (in shares)	56,940
Options grants in period (in shares)	261,075
Exercised (in shares)	(52,540)	(138,861)	(164,454)
Forfeited/canceled (in shares)	(17,898)
Ending balance (in shares)	247,577	56,940
Vested at period end (in shares)	237,236
Exercisable at period end (in shares)	4,400
Weighted- average exercise price
Beginning balance (in dollars per share)	$ 54.63
Granted (in dollars per share)	106.76
Exercised (in dollars per share)	54.52
Forfeited/canceled (in dollars per share)	106.76
Ending balance (in dollars per share)	105.86	$ 54.63
Vested at period end, Weighted- average exercise price (in dollars per share)	105.82
Exercisable at period end, Weighted- average exercise price (in dollars per share)	$ 55.90
Outstanding at period end, Weighted- average remaining contractual term	8 years 10 months 6 days
Vested at period end, Weighted- average remaining contractual term	8 years 10 months 2 days
Exercisable at period end, Weighted- average remaining contractual term	3 days
Outstanding at period end, Aggregate intrinsic value	$ 11
Vested at period end, Aggregate intrinsic value	11
Exercisable at period end, Aggregate intrinsic value	0
Aggregate intrinsic value of options exercised	$ 4	$ 9	$ 9
Weighted average period over which unrecognized compensation cost will be recognized	2 years 10 days
Cash received from exercise of options	$ 3
San Diego Gas and Electric Company [Member]
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Share-based compensation expense, before income taxes	10	12	13
Income tax benefit	(3)	(3)	(5)
Capitalized share-based compensation cost	6	6	5
Excess income tax deficiency	1	3	0
Share-based compensation expense, net of taxes	7	9	8
Southern California Gas Company [Member]
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Share-based compensation expense, before income taxes	15	16	17
Income tax benefit	(4)	(5)	(7)
Capitalized share-based compensation cost	5	4	4
Excess income tax deficiency	1	2	0
Share-based compensation expense, net of taxes	$ 11	$ 11	$ 10
Share-based Payment Arrangement, Option [Member]
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Expiration period	10 years
Awardsgrantedin2019 [Member] \| Share-based Payment Arrangement, Option [Member]
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Award vesting period	3 years
Awardsgrantedin2019 [Member] \| Restricted Stock Units (RSUs), Service-based [Member]
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Award requisite service period	3 years
Awardsgrantedin2010andprior [Member] \| Share-based Payment Arrangement, Option [Member]
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Award vesting period	4 years
Awarded during or after two thousand fifteen [Member] \| Performance Shares [Member]
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Award requisite service period	3 years
Award vesting rights maximum additional award	100.00%
Award vesting rights, Increase modifier for top quartile	20.00%
Award vesting rights, decrease modifier for bottom quartile	20.00%
Awards Before 2015 [Member] \| Performance Shares [Member]
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Award requisite service period	4 years
Awards Before 2015 [Member] \| Restricted Stock Units (RSUs), Service-based [Member]
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Award requisite service period	4 years
Awards Granted in 2013 and Earlier [Member]
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Award vesting rights maximum additional award	50.00%
Awarded During Or After Two Thousand and Fourteen [Member]
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Award vesting rights maximum additional award	100.00%
sre_Awardsbetween2015-2018 [Member] \| Restricted Stock Units (RSUs), Service-based [Member]
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
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Minimum [Member] \| Restricted Stock Units, Employee Stock Options, or Restricted Stock Awards [Member]
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Award requisite service period	3 years
Maximum [Member] \| Restricted Stock Units, Employee Stock Options, or Restricted Stock Awards [Member]
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Award requisite service period	4 years

Employee service share-based compensation, compensation expense, net of tax.

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Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

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Amount of cost capitalized for award under share-based payment arrangement.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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Amount of tax benefit for recognition of expense of award under share-based payment arrangement.

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Amount of cash outflow for realized tax benefit related to deductible compensation cost reported on the entity's tax return for equity instruments in excess of the compensation cost for those instruments recognized for financial reporting purposes.

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Amount of cash inflow from exercise of option under share-based payment arrangement.

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Estimated period over which an employee is required to provide service in exchange for the equity-based payment award, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Period over which grantee's right to exercise award under share-based payment arrangement is no longer contingent on satisfaction of service or performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, combination of market, performance or service condition.

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The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term.

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The risk-free interest rate assumption that is used in valuing an option on its own shares.

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Rate of weighted-average expected volatility for award under share-based payment arrangement.

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Number of shares authorized for issuance under share-based payment arrangement.

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The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable.

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Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares.

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For presentations that combine terminations, the number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan or that expired.

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Weighted average price of options that were either forfeited or expired.

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Net number of share options (or share units) granted during the period.

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Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding.

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Number of options outstanding, including both vested and non-vested options.

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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Amount by which current fair value of underlying stock exceeds exercise price of fully vested and expected to vest exercisable or convertible options. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur.

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Number of fully vested and expected to vest exercisable options that may be converted into shares under option plan. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur.

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Weighted-average exercise price, at which grantee can acquire shares reserved for issuance, for fully vested and expected to vest exercisable or convertible options. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur.

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Amount by which current fair value of underlying stock exceeds exercise price of fully vested and expected to vest options outstanding. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur.

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Number of fully vested and expected to vest options outstanding that can be converted into shares under option plan. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur.

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Weighted-average exercise price, at which grantee can acquire shares reserved for issuance, for fully vested and expected to vest options outstanding. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur.

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Weighted average price at which option holders acquired shares when converting their stock options into shares.

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Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options.

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Period from grant date that an equity-based award expires, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Expected term of award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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Weighted average remaining contractual term for vested portions of options outstanding and currently exercisable or convertible, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Weighted average remaining contractual term for option awards outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Weighted average remaining contractual term for fully vested and expected to vest exercisable or convertible options, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur.

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Weighted average remaining contractual term for fully vested and expected to vest options outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur.

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