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

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Restricted stock units issued by subsidary.

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- Definition

Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage, Decrease Modifier for Bottom Quartile

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No definition available.

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Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage, Increase Modifier for Top Quartile

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Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage, Maximum Additional Award

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- Definition

Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

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Represents the compensation cost capitalized during the period arising from equity-based compensation arrangements (for example, shares of stock, units, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

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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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The total recognized tax benefit related to compensation cost for equity-based payment arrangements recognized in income during the period.

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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 stock options granted under share-based compensation 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 which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Amount of cash paid related to share-based compensation liabilities.

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The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested).

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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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- Definition

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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- Definition

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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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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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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Number of share options (or share units) exercised during the current period.

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- SHARE-BASED COMPENSATION EXPENSE/ OPTIONS (Details) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended			96 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant	6,067,767			6,067,767
Number of shares authorized for issuance (in shares)	6,067,767			6,067,767
Share-based compensation expense, before income taxes	$ 76	$ 78	$ 46
Income tax benefit	(21)	(31)	(18)
Capitalized share-based compensation cost	10	9	7
Excess income tax deficiency (benefit)	15	0	(34)
Share-based compensation expense, net of taxes	$ 55	$ 47	$ 28
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Beginning balance (in shares)	195,801
Exercised (in shares)	(138,861)	(164,454)	(167,742)
Ending balance (in shares)	56,940	195,801		56,940
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract]
Beginning balance (in dollars per share)	$ 50.30
Exercised (in dollars per share)	48.53
Ending balance (in dollars per share)	$ 54.63	$ 50.30		$ 54.63
Outstanding at period end, Weighted- average remaining contractual term	10 months 24 days
Outstanding at period end, Aggregate intrinsic value	$ 3			$ 3
Vested at period end (in shares)	56,940			56,940
Vested at period end, Weighted- average exercise price (in dollars per share)	$ 54.63			$ 54.63
Vested at period end, Weighted- average remaining contractual term	10 months 24 days
Vested at period end, Aggregate intrinsic value	$ 3			$ 3
Exercisable at period end (in shares)	56,940			56,940
Exercisable at period end, Weighted- average exercise price (in dollars per share)	$ 54.63			$ 54.63
Exercisable at period end, Weighted- average remaining contractual term	10 months 24 days
Exercisable at period end, Aggregate intrinsic value	$ 3			$ 3
Aggregate intrinsic value of options exercised	9	$ 9	$ 8
Cash received from exercise of options	7
Options grants in period (in shares)				0
San Diego Gas and Electric Company [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Share-based compensation expense, before income taxes	12	13	7
Income tax benefit	(3)	(5)	(3)
Capitalized share-based compensation cost	6	5	4
Excess income tax deficiency (benefit)	3	0	(7)
Share-based compensation expense, net of taxes	9	8	4
Southern California Gas Company [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Share-based compensation expense, before income taxes	16	17	8
Income tax benefit	(5)	(7)	(3)
Capitalized share-based compensation cost	4	4	3
Excess income tax deficiency (benefit)	2	0	(4)
Share-based compensation expense, net of taxes	$ 11	$ 10	$ 5
IENova Plans [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Restricted stock units issued by subsidiary (in shares)	966,747	1,043,709	378,367	966,747
Restricted stock units issued by subsidiary, outstanding (in shares)	696,787			696,787
Cash paid to settle awards	$ 3	$ 2	$ 1
Employee Stock Option [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Award vesting period	4 years
Expiration period	10 years
Restricted Stock Units (RSUs), Service-based [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Award requisite service period	3 years
Restricted Stock Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Award requisite service period	4 years
Awarded during or after two thousand fifteen [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
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%
Awarded during or after two thousand fifteen [Member] \| Performance Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Award requisite service period	3 years
Awarded During Or After Two Thousand and Fourteen [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Award vesting rights maximum additional award	100.00%
Awards Before 2015 [Member] \| Performance Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Award requisite service period	4 years
Awards Before 2015 [Member] \| Restricted Stock Units (RSUs), Service-based [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Award requisite service period	4 years
Awards Granted in 2013 and Earlier [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Award vesting rights maximum additional award	50.00%
Minimum [Member] \| Restricted Stock Units, Employee Stock Options, or Restricted Stock Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Award requisite service period	3 years
Maximum [Member] \| Restricted Stock Units, Employee Stock Options, or Restricted Stock Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Award requisite service period	4 years