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ACQUISITIONS, DIVESTITURES AND DISCONTINUED OPERATIONS - ACQUISITION ACTIVITY (Details) - USD ($) $ / shares in Units, $ in Millions |  |  |  | 3 Months Ended
--- | --- | --- | --- | ---
Dec. 18, 2018 | Oct. 18, 2018 | Mar. 09, 2018 | Mar. 31, 2019
Oncor Electric Delivery Company LLC. [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Acquired percentage interest |  |  | 80.25% |
Compania Transmisora del Norte Grande S.A. [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Cash consideration | $ 208 |  |  |
Consideration | 226 |  |  |
Cash acquired | $ 18 |  |  |
Sempra Texas Holdings Corp [Member] | Oncor Electric Delivery Company LLC. [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Acquired percentage interest |  |  | 80.03% |
Sempra Texas Holdings Corp [Member] | Sempra Texas Intermediate Holding Company LLC [Member] | Oncor Holdings [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Ownership percentage in consolidated entity |  |  | 100.00% |
Sempra Texas Holdings Corp [Member] | Texas Transmission Investment LLC [Member] | Oncor Electric Delivery Company LLC. [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Ownership percentage held by noncontrolling owners |  |  | 19.75% |
Sempra Texas Holdings Corp [Member] | Oncor Holdings [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Cash consideration |  |  | $ 9,450 |
Adjustment for dividends |  |  | $ 31 |
Sempra Texas Holdings Corp [Member] | Oncor Holdings [Member] | Oncor Electric Delivery Company LLC. [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Ownership percentage in consolidated entity |  |  | 80.25% |
Oncor Electric Delivery Company LLC Additional Acquisition [Member] | Sempra Texas Intermediate Holding Company LLC [Member] | Oncor Holdings [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Cash consideration |  |  | $ 26 |
Oncor Electric Delivery Company LLC Additional Acquisition [Member] | Oncor Electric Delivery Company LLC. [Member] | Oncor Holdings [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Acquired percentage interest |  |  | 0.22% |
Compania Transmisora del Norte Grande S.A. [Member] | Sempra South American Utilities [Member] | Compania Transmisora del Norte Grande S.A. [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Acquired percentage interest | 100.00% |  |  |
InfraREIT Acquisition [Member] | Sempra Texas Utility [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Consideration |  | $ 1,275 |  |
Acquisition price per share acquired |  | $ 21 |  |
Management agreement termination fee paid |  | $ 40 |  |
Debt assumed |  |  |  | $ 946
InfraREIT Acquisition [Member] | Sempra Texas Utility [Member] | InfraREIT [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Acquired percentage interest |  | 100.00% |  |
InfraREIT Acquisition [Member] | Sempra Texas Utility [Member] | InfraREIT Partners [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Acquired percentage interest |  | 100.00% |  |
Sharyland Holdings, LP [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Commitment to invest |  | $ 1,025 |  |
Sharyland Holdings, LP [Member] | Sempra Texas Utility [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Acquired percentage interest |  | 50.00% |  |
Consideration |  | $ 98 |  |
Sharyland Holdings, LP [Member] | Sempra Texas Utility [Member] | Sharyland Utilities [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Ownership percentage in consolidated entity |  | 50.00% |  |
Acquired percentage interest |  | 100.00% |  |

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