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INCOME TAXES - EFFECTS OF THE TAX CUTS AND JOBS ACT OF 2017 (Details) - USD ($) $ in Millions | 1 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Schedule of Effect of Changes in Legislation of Income Tax (Expense) [Line Items] |  |  |  |
U.S. federal statutory income tax rate |  | 21.00% | 35.00% | 35.00%
Income tax expense recognized in current period, related to remeasurement of deferred income tax assets and liabilities |  | $ 20 |  |
Income tax expense, related to remeasurement of deferred income tax assets and liabilities |  | 49 | $ 182 |
Increase in net regulatory liabilities from remeasurement of deferred tax income tax assets and liabilities |  | 33 | 2,402 |
Decrease in net deferred income tax liabilities due to remeasurement |  | 16 | (2,220) |
Income tax expense related to deemed repatriation |  | (8) | 328 |
Foreign undistributed earnings | $ 4,000 | 3,700 | 4,000 |
Foreign earnings repatriated |  | 338 |  |
U.S. state and non-U.S. withholding tax expense, related to expected future repatriation of foreign earnings |  | 44 | 360 |
Total increase in income tax expense | $ 870 | 85 | $ 870 |
Undistributed earnings of foreign subsidiaries considered to be indefinitely reinvested |  | $ 1,000 |  |
San Diego Gas and Electric Company [Member] |  |  |  |
Schedule of Effect of Changes in Legislation of Income Tax (Expense) [Line Items] |  |  |  |
U.S. federal statutory income tax rate |  | 21.00% | 35.00% | 35.00%
Income tax expense, related to remeasurement of deferred income tax assets and liabilities |  | $ 0 | $ 28 |
Increase in net regulatory liabilities from remeasurement of deferred tax income tax assets and liabilities |  | 38 | 1,428 |
Decrease in net deferred income tax liabilities due to remeasurement |  | (38) | (1,400) |
Income tax expense related to deemed repatriation |  | 0 | 0 |
U.S. state and non-U.S. withholding tax expense, related to expected future repatriation of foreign earnings |  | 0 | 0 |
Total increase in income tax expense |  | $ 0 | $ 28 |
Southern California Gas Company [Member] |  |  |  |
Schedule of Effect of Changes in Legislation of Income Tax (Expense) [Line Items] |  |  |  |
U.S. federal statutory income tax rate |  | 21.00% | 35.00% | 35.00%
Income tax expense, related to remeasurement of deferred income tax assets and liabilities |  | $ 0 | $ 2 |
Increase in net regulatory liabilities from remeasurement of deferred tax income tax assets and liabilities |  | (5) | 974 |
Decrease in net deferred income tax liabilities due to remeasurement |  | 5 | (972) |
Income tax expense related to deemed repatriation |  | 0 | 0 |
U.S. state and non-U.S. withholding tax expense, related to expected future repatriation of foreign earnings |  | 0 | 0 |
Total increase in income tax expense |  | 0 | $ 2 |
U.S. Federal [Member] |  |  |  |
Schedule of Effect of Changes in Legislation of Income Tax (Expense) [Line Items] |  |  |  |
Operating loss valuation allowance |  | $ 29 |  |

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