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EMPLOYEE BENEFIT PLANS - NARRATIVE (Details) - USD ($) $ in Millions |  | 12 Months Ended
--- | --- | ---
Mar. 09, 2018 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Dedicated assets in support of certain benefit plans |  | $ 416 | $ 455 |
Benefit obligation payment for settlement |  | 54 |  |
Pension Plan [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Plan amendments |  | 12 | 1 |
Plan assets, payment for settlement |  | 394 | 194 |
Settlement charges |  | 12 | 8 | $ 0
Increase due to business combination |  | 0 | 0 |
Increase in liability due to special termination benefits |  | 0 | 0 |
Settlements |  | 394 | 194 | 75
Settlement charge |  |  | 38 | 16
Other Postretirement Benefits Plan [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Plan amendments |  | 0 | 0 |
Plan assets, payment for settlement |  | 0 | 0 |
Settlement charges |  | 0 | 0 | 0
Increase due to business combination |  | 21 | 0 |
Increase in liability due to special termination benefits |  | 5 | 18 | 26
Settlements |  | 0 | 0 |
San Diego Gas and Electric Company [Member] | Pension Plan [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Plan amendments |  | 8 | 0 |
Plan assets, payment for settlement |  | 145 | 0 |
Settlement charges |  | 4 | 0 | 0
Increase in liability due to special termination benefits |  | 0 | 0 |
Settlements |  | 145 | 0 | 75
Settlement charge |  |  |  | 16
San Diego Gas and Electric Company [Member] | Other Postretirement Benefits Plan [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Plan amendments |  | 0 | 0 |
Plan assets, payment for settlement |  | 0 | 0 |
Settlement charges |  | 0 | 0 | 0
Increase in liability due to special termination benefits |  | 3 | 0 | 14
Settlements |  | 0 | 0 |
Southern California Gas Company [Member] | Pension Plan [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Plan assets, payment for settlement |  | 231 | 175 |
Increase in liability due to special termination benefits |  | 0 | 0 |
Settlements |  | 231 | 175 |
Settlement charge |  |  | 30 |
Southern California Gas Company [Member] | Other Postretirement Benefits Plan [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Plan assets, payment for settlement |  | 0 | 0 |
Increase in liability due to special termination benefits |  | 2 | 18 | $ 11
Settlements |  | 0 | 0 |
Qualified Plan [Member] | Pension Plan [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Plan assets, payment for settlement |  | 363 |  |
Qualified Plan [Member] | San Diego Gas and Electric Company [Member] | Pension Plan [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Plan assets, payment for settlement |  | 132 |  |
Benefit obligation payment for settlement |  | 22 |  |
Qualified Plan [Member] | Southern California Gas Company [Member] | Pension Plan [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Plan assets, payment for settlement |  | 231 |  |
Benefit obligation payment for settlement |  | 32 |  |
Nonqualified Plan [Member] | Pension Plan [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Benefit obligation payment for settlement |  | 12 | $ 8 |
Nonqualified Plan [Member] | San Diego Gas and Electric Company [Member] | Pension Plan [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Benefit obligation payment for settlement |  | $ 4 |  |
Sempra Texas Holdings Corp [Member] | Sempra Texas Intermediate Holding Company LLC [Member] | Other Postretirement Benefits Plan [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Increase due to business combination | $ 21 |  |  |
Sempra Texas Holdings Corp [Member] | Oncor Electric Delivery Company LLC [Member] | Sempra Texas Intermediate Holding Company LLC [Member] | Other Postretirement Benefits Plan [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Gain (loss) arising during the period | $ 27 |  |  |

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- Definition The amount of cash, securities, or other assets held by a third-party trustee pursuant to the terms of an agreement which assets are available to be used by beneficiaries to that agreement only within the specific terms thereof and which agreement is expected to terminate more than one year from the balance sheet date (or operating cycle, if longer) at which time the assets held-in-trust will be released or forfeited. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(b)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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