SHARE-BASED COMPENSATION (Details) $ / shares in Units, $ in Millions	12 Months Ended
Dec. 31, 2015 USD ($) $ / shares shares	Dec. 31, 2014 USD ($) $ / shares shares	Dec. 31, 2013 USD ($) $ / shares shares
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Allocated Share-based Compensation Expense	$ 48	$ 46	$ 38
Employee Service Share-based Compensation, Tax Benefit from Compensation Expense	(19)	(18)	(15)
Employee Service Share-Based Compensation, Compensation Expense, Net Of Tax	$ 29	$ 28	$ 23
Employee Service Share-Based Compensation, Compensation Expense, Net Of Tax, Per Basic Share \| $ / shares	$ 0.12	$ 0.11	$ 0.09
Employee Service Share-Based Compensation, Compensation Expense, Net Of Tax, Per Diluted Share \| $ / shares	$ 0.12	$ 0.11	$ 0.09
Employee Service Share-based Compensation, Allocation of Recognized Period Costs, Capitalized Amount	$ 6	$ 5	$ 4
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number, Beginning Balance \| shares	757,412
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price, Beginning of Period \| $ / shares	$ 53.84
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period \| shares	0	0	0
Exercised Stock Options \| shares	(227,815)
Share-based Compensation Arrangements by Share-based Payment Award, Options, Exercises in Period, Weighted Average Exercise Price \| $ / shares	$ 54.48
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Total Intrinsic Value	$ 12	$ 33	$ 41
Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures and Expirations in Period \| shares	(1,600)
Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures and Expirations in Period, Weighted Average Exercise Price \| $ / shares	$ 36.3
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number, Ending Balance \| shares	527,997	757,412
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price, End of Period \| $ / shares	$ 53.62	$ 53.84
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term	2.6
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value	$ 21
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Number \| shares	527,997
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Weighted Average Exercise Price \| $ / shares	$ 53.62
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Weighted Average Remaining Contractual Term	2.6
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Aggregate Intrinsic Value	$ 21
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Exercisable, Number \| shares	527,997
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Exercisable, Weighted Average Exercise Price \| $ / shares	$ 53.62
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Exercisable, Weighted Average Remaining Contractual Term	2.6
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Exercisable, Aggregate Intrinsic Value	$ 21
Share-Based Compensation Arrangement By Share-Based Payment Award, Options, Vested In Period, Total Fair Value		$ 1	$ 2
Restricted Stock Units Issued By Subsidiary, Outstanding \| shares	570,218
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized \| shares	6,148,009
Employee Service Share-based Compensation, Cash Received from Exercise of Stock Options	$ 12
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant \| shares	6,148,009
Restricted stock units issued by subsidary \| shares	278,538	468,339	1,014,899
Employee Service Share-based Compensation, Tax Benefit Realized from Exercise of Stock Options	$ 52
IENova Plans [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Share-based Liabilities Paid	4	$ 3	$ 0
San Diego Gas and Electric Company [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Allocated Share-based Compensation Expense	8	8	8
Employee Service Share-based Compensation, Allocation of Recognized Period Costs, Capitalized Amount	4	3	3
Southern California Gas Company [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Allocated Share-based Compensation Expense	10	8	8
Employee Service Share-based Compensation, Allocation of Recognized Period Costs, Capitalized Amount	$ 2	$ 2	$ 1

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Exercised stock options.

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Share-based compensation arrangement by share-based payment award, options, outstanding, weighted average remaining contractual term.

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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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Aggregate proceeds received by the entity during the annual period from exercises of stock or unit options and conversion of similar instruments granted under equity-based payment arrangements.

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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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Disclosure of the aggregate tax benefit realized from the exercise of stock options and the conversion of similar instruments during the annual period.

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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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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 of difference between fair value of the underlying shares reserved for issuance and exercise price of fully vested and expected to vest options that are exercisable.

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The number of exercisable share options (fully vested and expected to vest) that may be converted as of the balance sheet date.

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As of the balance sheet date, the weighted-average exercise price (at which grantees can acquire the shares reserved for issuance) for exercisable stock options that are fully vested or expected to vest.

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As of the balance sheet date, the number of shares into which fully vested and expected to vest stock options outstanding can be converted under the option plan.

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As of the balance sheet date, the weighted-average exercise price for outstanding stock options that are fully vested or expected to vest.

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

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