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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 |  |  |

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- Definition 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. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e)(1) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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