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SIGNIFICANT ACCOUNTING POLICIES AND OTHER FINANCIAL DATA - NONCONTROLLING INTERESTS (Details) $ / shares in Units, $ in Millions, $ in Millions |  |  | 1 Months Ended | 3 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Jan. 12, 2018 USD ($) | Oct. 13, 2016 USD ($) $ / shares $ / $ shares | Oct. 13, 2016 MXN ($) shares | Feb. 28, 2019 USD ($) shares | Dec. 31, 2018 USD ($) | Apr. 30, 2018 USD ($) | Jan. 31, 2018 USD ($) | Dec. 31, 2016 USD ($) facility | Dec. 31, 2018 USD ($) shares | Dec. 31, 2017 USD ($) facility company | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Sep. 30, 2018 | Oct. 19, 2016 | Oct. 18, 2016
Noncontrolling Interest [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock repurchased in the period |  |  |  |  |  |  |  |  |  |  | $ 21 | $ 15 | $ 56 |  |  |
Repayments of debt | $ 800 |  |  |  |  |  | $ 800 |  |  |  |  |  |  |  |  |
Impact of issuance on equity |  |  |  |  |  |  |  |  |  |  | 90 | 196 | 1,701 |  |  |
Decrease from divestiture from noncontrolling interests |  |  |  |  |  |  |  |  |  |  | 486 |  |  |  |  |
IEnova [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Noncontrolling Interest [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock repurchased during the period (in shares) | shares |  |  |  |  |  |  |  |  | 2,000,000 |  |  |  |  |  |  |
Stock repurchased in the period |  |  |  |  |  |  |  |  | $ 7 |  |  |  |  |  |  |
Ownership interest |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 66.40% | 81.10%
Price of shares issued (in pesos per share) | $ / shares |  | $ 80.00 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Additional shares purchased (in shares) | shares |  | 83,125,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash consideration (fair value of total consideration) |  | $ 351 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares issued (in shares) | shares |  | 380,000,000 | 380,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from sale of shares |  | $ 1,570 | $ 29,860 |  |  |  |  |  |  |  |  |  |  |  |  |
Exchange rate (in pesos) | $ / $ |  | 18.96 |  |  |  |  |  |  |  |  |  |  |  |  |  |
IEnova [Member] | Bridge Loan [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Noncontrolling Interest [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repayments of debt |  | $ 1,150 |  |  |  |  |  |  |  |  |  |  |  |  |  |
IEnova [Member] | Related Party Debt [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Noncontrolling Interest [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repayments of debt |  | 100 |  |  |  |  |  |  |  |  |  |  |  |  |  |
IEnova [Member] | Revolving Credit Facility [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Noncontrolling Interest [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repayments of debt |  | 250 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ventika [Member] | IEnova [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Noncontrolling Interest [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash consideration (fair value of total consideration) |  | $ 50 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shareholders' equity [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Noncontrolling Interest [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock repurchased in the period |  |  |  |  |  |  |  |  |  |  | 21 | 15 | 56 |  |  |
Impact of issuance on equity |  |  |  |  |  |  |  |  |  |  | 4 |  | 281 |  |  |
Shareholders' equity [Member] | IEnova [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Noncontrolling Interest [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Impact of issuance on equity |  |  |  |  |  |  |  |  |  |  |  |  | 281 |  |  |
Non-controlling interests [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Noncontrolling Interest [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Impact of issuance on equity |  |  |  |  |  |  |  |  |  |  | 86 | $ 196 | 1,420 |  |  |
Decrease from divestiture from noncontrolling interests |  |  |  |  |  |  |  |  |  |  | $ 486 |  |  |  |  |
Non-controlling interests [Member] | IEnova [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Noncontrolling Interest [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Impact of issuance on equity |  |  |  |  |  |  |  |  |  |  |  |  | $ 948 |  |  |
Sempra Renewables [Member] | Noncontrolling Tax Equity Investors [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Noncontrolling Interest [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of tax equity limited liability companies formed | company |  |  |  |  |  |  |  |  |  | 2 |  |  |  |  |  |
Proceeds from sale of noncontrolling interests |  |  |  |  |  |  |  | $ 474 |  |  |  |  |  |  |  |
Sempra Renewables [Member] | Tax equity arrangement – solar [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Noncontrolling Interest [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Decrease from divestiture from noncontrolling interests |  |  |  |  | $ 486 |  |  |  |  |  |  |  |  |  |  |
Solar Power Projects [Member] | Sempra Renewables [Member] | Noncontrolling Tax Equity Investors [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Noncontrolling Interest [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of facilities acquired | facility |  |  |  |  |  |  |  | 3 |  | 4 |  |  |  |  |  |
Proceeds from sale of noncontrolling interests |  |  |  |  |  | $ 85 |  |  |  | $ 104 |  |  |  |  |  |
Wind Generation Projects [Member] | Sempra Renewables [Member] | Noncontrolling Tax Equity Investors [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Noncontrolling Interest [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of facilities acquired | facility |  |  |  |  |  |  |  |  |  | 1 |  |  |  |  |  |
Proceeds from sale of noncontrolling interests |  |  |  |  |  |  |  |  |  | $ 92 |  |  |  |  |  |
IEnova [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Noncontrolling Interest [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership interest |  |  |  |  | 66.50% |  |  |  | 66.50% |  | 66.50% |  |  | 66.40% |  |
Subsequent Event [Member] | IEnova [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Noncontrolling Interest [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock repurchased during the period (in shares) | shares |  |  |  | 1,600,000 |  |  |  |  |  |  |  |  |  |  |  |
Stock repurchased in the period |  |  |  | $ 6 |  |  |  |  |  |  |  |  |  |  |  |

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