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INCOME TAXES - UNRECOGNIZED TAX BENEFITS (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Reconciliation of Unrecognized Tax Benefits |  |  |
Beginning balance | $ 89 | $ 90 | $ 87
Increase in prior period tax positions | 7 | 22 | 2
Decrease in prior period tax positions | (1) | (15) | (2)
Increase in current period tax positions | 24 | 4 | 6
Settlements with taxing authorities | 0 | (12) | (3)
Ending balance | 119 | 89 | 90
Of the total, amounts related to tax positions that, if recognized, in future years, would decrease the effective tax rate | (107) | (77) | (87)
Of the total, amounts related to tax positions that, if recognized, in future years, would increase the effective tax rate | 24 | 20 | 36
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued [Abstract] |  |  |
Accrued interest and penalties | 1 | 0 |
Unrecognized Tax Benefits, Income Tax Penalties and Interest Expense [Abstract] |  |  |
Interest income and penalties on unrecognized income tax benefits | 1 | 0 | 0
San Diego Gas and Electric Company [Member] |  |  |
Reconciliation of Unrecognized Tax Benefits |  |  |
Beginning balance | 10 | 22 | 20
Increase in prior period tax positions | 1 | 9 | 0
Decrease in prior period tax positions | 0 | (11) | 0
Increase in current period tax positions | 0 | 0 | 2
Settlements with taxing authorities | 0 | (10) | 0
Ending balance | 11 | 10 | 22
Of the total, amounts related to tax positions that, if recognized, in future years, would decrease the effective tax rate | (9) | (7) | (19)
Of the total, amounts related to tax positions that, if recognized, in future years, would increase the effective tax rate | 1 | 1 | 13
Southern California Gas Company [Member] |  |  |
Reconciliation of Unrecognized Tax Benefits |  |  |
Beginning balance | 35 | 29 | 27
Increase in prior period tax positions | 2 | 3 | 0
Decrease in prior period tax positions | 0 | 0 | (2)
Increase in current period tax positions | 24 | 4 | 4
Settlements with taxing authorities | 0 | (1) | 0
Ending balance | 61 | 35 | 29
Of the total, amounts related to tax positions that, if recognized, in future years, would decrease the effective tax rate | (51) | (26) | (29)
Of the total, amounts related to tax positions that, if recognized, in future years, would increase the effective tax rate | $ 23 | $ 20 | $ 24

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