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ACQUISTION AND DIVESTITURE ACTIVITY - ASSETS ACQUIRED AND LIABILITIES ASSUMED (Details) - USD ($) $ in Millions |  |  |  |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | --- | ---
Dec. 18, 2018 | Mar. 09, 2018 | Dec. 14, 2016 | Sep. 26, 2016 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Fair value of equity interest in IEnova Pipelines immediately prior to acquisition |  |  |  |  |  |  |  | $ 0 | $ 28 | $ 1,144
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities [Abstract] |  |  |  |  |  |  |  |  |  |
Goodwill |  |  |  |  | $ 2,373 | $ 2,397 | $ 2,364 | 2,373 | 2,397 | 2,364
Acquisition of business – measurement period adjustment |  |  |  |  |  |  |  |  | $ (13) |
Compania Transmisora del Norte Grande S.A. [Member] |  |  |  |  |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets [Abstract] |  |  |  |  |  |  |  |  |  |
Cash and cash equivalents | $ 18 |  |  |  |  |  |  |  |  |
Other current assets | 5 |  |  |  |  |  |  |  |  |
Other intangible assets | 46 |  |  |  |  |  |  |  |  |
Property, plant and equipment | 162 |  |  |  |  |  |  |  |  |
Total assets acquired | 231 |  |  |  |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities [Abstract] |  |  |  |  |  |  |  |  |  |
Other current liabilities | 1 |  |  |  |  |  |  |  |  |
Deferred income taxes | 42 |  |  |  |  |  |  |  |  |
Total liabilities assumed | 43 |  |  |  |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net | 188 |  |  |  |  |  |  |  |  |
Goodwill | 38 |  |  |  |  |  |  |  |  |
Consideration transferred | $ 226 |  |  |  |  |  |  |  |  |
Oncor Holdings Electric Delivery Company LLC [Member] |  |  |  |  |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets [Abstract] |  |  |  |  |  |  |  |  |  |
Accounts receivable |  | $ 1 |  |  |  |  |  |  |  |
Due from unconsolidated affiliates |  | 46 |  |  |  |  |  |  |  |
Investment in Oncor Holdings |  | 9,227 |  |  |  |  |  |  |  |
Deferred income taxes |  | 287 |  |  |  |  |  |  |  |
Other noncurrent assets |  | 109 |  |  |  |  |  |  |  |
Total assets acquired |  | 9,670 |  |  |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities [Abstract] |  |  |  |  |  |  |  |  |  |
Other current liabilities |  | 23 |  |  |  |  |  |  |  |
Pension and other postretirement benefit plan obligations |  | 21 |  |  |  |  |  |  |  |
Deferred credits and other |  | 58 |  |  |  |  |  |  |  |
Total liabilities assumed |  | 102 |  |  |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net |  | 9,568 |  |  |  |  |  |  |  |
Consideration transferred |  | $ 9,568 |  |  |  |  |  |  |  |
Oncor Holdings Electric Delivery Company LLC [Member] | Scenario, Adjustment [Member] |  |  |  |  |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets [Abstract] |  |  |  |  |  |  |  |  |  |
Investment in Oncor Holdings |  |  |  |  | 64 |  |  | 64 |  |
Deferred income taxes |  |  |  |  | 66 |  |  | 66 |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities [Abstract] |  |  |  |  |  |  |  |  |  |
Deferred credits and other |  |  |  |  | 2 |  |  | 2 |  |
Consideration transferred |  |  |  |  | 2 |  |  |  |  |
Sempra Mexico [Member] | IEnova Pipelines [Member] |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Cash consideration (fair value of total consideration) |  |  |  | $ 1,144 |  |  |  |  |  |
Fair value of equity interest in IEnova Pipelines immediately prior to acquisition |  |  |  | 1,144 |  |  |  |  |  |
Total fair value of business combination |  |  |  | 2,288 |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets [Abstract] |  |  |  |  |  |  |  |  |  |
Cash and cash equivalents |  |  |  | 66 |  |  |  |  |  |
Restricted cash |  |  |  | 0 |  |  |  |  |  |
Accounts receivable |  |  |  | 39 |  |  |  |  |  |
Other current assets |  |  |  | 6 |  |  |  |  |  |
Other intangible assets |  |  |  | 0 |  |  |  |  |  |
Deferred income taxes |  |  |  | 0 |  |  |  |  |  |
Regulatory assets |  |  |  | 33 |  |  |  |  |  |
Property, plant and equipment |  |  |  | 1,248 |  |  |  |  |  |
Other noncurrent assets |  |  |  | 1 |  |  |  |  |  |
Total assets acquired |  |  |  | 1,393 |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities [Abstract] |  |  |  |  |  |  |  |  |  |
Short-term debt |  |  |  | 0 |  |  |  |  |  |
Accounts payable |  |  |  | 11 |  |  |  |  |  |
Due to unconsolidated affiliates |  |  |  | 3 |  |  |  |  |  |
Current portion of long-term debt |  |  |  | 49 |  |  |  |  |  |
Fixed-price contracts and other derivatives, current |  |  |  | 6 |  |  |  |  |  |
Other current liabilities |  |  |  | 20 |  |  |  |  |  |
Long-term debt |  |  |  | 315 |  |  |  |  |  |
Asset retirement obligations |  |  |  | 5 |  |  |  |  |  |
Deferred income taxes |  |  |  | 127 |  |  |  |  |  |
Fixed-price contracts and other derivatives, noncurrent |  |  |  | 19 |  |  |  |  |  |
Other noncurrent liabilities |  |  |  | 11 |  |  |  |  |  |
Total liabilities assumed |  |  |  | 566 |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net |  |  |  | 827 |  |  |  |  |  |
Goodwill |  |  |  | $ 1,461 |  |  |  |  |  |
Sempra Mexico [Member] | IEnova Pipelines [Member] | Scenario, Adjustment [Member] |  |  |  |  |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets [Abstract] |  |  |  |  |  |  |  |  |  |
Regulatory assets |  |  |  |  |  |  | 33 |  |  | 33
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities [Abstract] |  |  |  |  |  |  |  |  |  |
Deferred income taxes |  |  |  |  |  |  | 119 |  |  | $ 119
Acquisition of business – measurement period adjustment |  |  |  |  |  |  | $ 86 |  |  |
Sempra Mexico [Member] | Ventika [Member] |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Cash consideration (fair value of total consideration) |  |  | $ 310 |  |  |  |  |  |  |
Fair value of equity interest in IEnova Pipelines immediately prior to acquisition |  |  | 0 |  |  |  |  |  |  |
Total fair value of business combination |  |  | 310 |  |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets [Abstract] |  |  |  |  |  |  |  |  |  |
Cash and cash equivalents |  |  | 0 |  |  |  |  |  |  |
Restricted cash |  |  | 68 |  |  |  |  |  |  |
Accounts receivable |  |  | 14 |  |  |  |  |  |  |
Other current assets |  |  | 1 |  |  |  |  |  |  |
Other intangible assets |  |  | 154 |  |  |  |  |  |  |
Deferred income taxes |  |  | 36 |  |  |  |  |  |  |
Regulatory assets |  |  | 0 |  |  |  |  |  |  |
Property, plant and equipment |  |  | 673 |  |  |  |  |  |  |
Other noncurrent assets |  |  | 3 |  |  |  |  |  |  |
Total assets acquired |  |  | 949 |  |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities [Abstract] |  |  |  |  |  |  |  |  |  |
Short-term debt |  |  | 125 |  |  |  |  |  |  |
Accounts payable |  |  | 1 |  |  |  |  |  |  |
Due to unconsolidated affiliates |  |  | 0 |  |  |  |  |  |  |
Current portion of long-term debt |  |  | 7 |  |  |  |  |  |  |
Fixed-price contracts and other derivatives, current |  |  | 4 |  |  |  |  |  |  |
Other current liabilities |  |  | 8 |  |  |  |  |  |  |
Long-term debt |  |  | 478 |  |  |  |  |  |  |
Asset retirement obligations |  |  | 2 |  |  |  |  |  |  |
Deferred income taxes |  |  | 120 |  |  |  |  |  |  |
Fixed-price contracts and other derivatives, noncurrent |  |  | 10 |  |  |  |  |  |  |
Other noncurrent liabilities |  |  | 0 |  |  |  |  |  |  |
Total liabilities assumed |  |  | 755 |  |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net |  |  | 194 |  |  |  |  |  |  |
Goodwill |  |  | $ 116 |  |  |  |  |  |  |
Sempra Mexico [Member] | Ventika [Member] | Scenario, Adjustment [Member] |  |  |  |  |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets [Abstract] |  |  |  |  |  |  |  |  |  |
Deferred income taxes |  |  |  |  | $ 13 |  |  | $ 13 |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities [Abstract] |  |  |  |  |  |  |  |  |  |
Acquisition of business – measurement period adjustment |  |  |  |  |  | $ (13) |  |  |  |

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