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ACQUISTION AND DIVESTITURE ACTIVITY - Sempra Texas Utility (Details) - USD ($) $ in Millions |  |  |  |  |  | 1 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | --- | --- | --- | ---
Jul. 13, 2018 | Mar. 09, 2018 | Mar. 08, 2018 | Jan. 12, 2018 | Jan. 09, 2018 | Jan. 31, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Repayments of debt |  |  |  | $ 800 |  | $ 800 |  |  |  |  |
Issuances of common stock, net of $41 in offering costs in 2018 |  |  |  |  |  |  |  |  | $ 2,272 | $ 47 | $ 51
Oncor Holdings Electric Delivery Company LLC [Member] |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Acquired percentage interest |  | 80.25% |  |  |  |  |  |  |  |  |
Oncor Electric Delivery Company LLC [Member] |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Acquired percentage interest |  | 80.25% |  |  |  |  |  |  |  |  |
Sempra Texas Holdings Corp [Member] |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Proceeds from issuance of debt and equity |  |  |  |  |  | $ 7,000 |  |  |  |  |
Sempra Texas Holdings Corp [Member] | Oncor Electric Delivery Company LLC [Member] |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Acquired percentage interest |  | 80.03% |  |  |  |  |  |  |  |  |
Oncor Electric Delivery Company LLC [Member] | Oncor Electric Delivery Company LLC Additional Acquisition [Member] | Oncor Holdings Electric Delivery Company LLC [Member] |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Ownership percentage in consolidated entity |  | 0.22% |  |  |  |  |  |  |  |  |
Acquired percentage interest |  | 0.22% |  |  |  |  |  |  |  |  |
Consideration transferred |  | $ 26 |  |  |  |  |  |  |  |  |
Sempra Texas Intermediate Holding Company LLC [Member] | Sempra Texas Holdings Corp [Member] | Oncor Holdings Electric Delivery Company LLC [Member] |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Ownership percentage in consolidated entity |  | 100.00% |  |  |  |  |  |  |  |  |
Sempra Texas Intermediate Holding Company LLC [Member] | Oncor Electric Delivery Company LLC Additional Acquisition [Member] | Oncor Holdings Electric Delivery Company LLC [Member] |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Cash consideration (fair value of total consideration) |  | $ 26 |  |  |  |  |  |  |  |  |
Texas Transmission Investment LLC [Member] | Sempra Texas Holdings Corp [Member] | Oncor Electric Delivery Company LLC [Member] |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Ownership percentage held by noncontrolling owners |  | 19.75% |  |  |  |  |  |  |  |  |
Oncor Holdings Electric Delivery Company LLC [Member] | Sempra Texas Holdings Corp [Member] |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Cash consideration (fair value of total consideration) |  | $ 9,450 |  |  |  |  |  |  |  |  |
Additional consideration transfered |  | 31 |  |  |  |  |  |  |  |  |
Transaction costs incurred |  | $ 59 |  |  |  |  |  |  |  |  |
Common Stock [Member] |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Shares issued (in shares) | 11,212,500 |  | 8,556,630 |  | 26,869,158 |  | 7,651,671 | 8,556,630 |  |  |
Settlement of Forward Sale Contracts [Member] | Common Stock [Member] |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Issuances of common stock, net of $41 in offering costs in 2018 |  |  | $ 900 |  |  |  | $ 800 | $ 900 |  |  |
Payments of stock issuance costs |  |  | 16 |  |  |  |  |  |  |  |
Commercial paper [Member] | Oncor Holdings Electric Delivery Company LLC [Member] | Sempra Texas Holdings Corp [Member] |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Proceeds from issuance of debt |  |  | $ 2,600 |  |  |  |  |  |  |  |
Weighted average term, of line of credit |  |  | 47 days |  |  |  |  |  |  |  |
Weighted average rate |  |  | 2.20% |  |  |  |  |  |  |  |

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