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INCOME TAXES - UNRECOGNIZED TAX BENEFITS (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Reconciliation of Unrecognized Tax Benefits |  |  |
Beginning balance | $ 278 | $ 304 | $ 99
Increase in prior period tax positions | 308 | 16 | 3
Decrease in prior period tax positions | (63) | (2) | (2)
Decrease in current period tax positions | (21) | 0 | 0
Settlements with tax authorities | (16) | (43) | 0
Expiration of statutes of limitations | 0 | (1) | 0
Increase in current period tax positions | 6 | 4 | 204
Ending balance | 492 | 278 | 304
Of the total, amounts related to tax positions that, if recognized, in future years, would decrease the effective tax rate | (224) | (117) | (105)
Of the total, amounts related to tax positions that, if recognized, in future years, would increase the effective tax rate | 1 | 38 | 34
SDG&E |  |  |
Reconciliation of Unrecognized Tax Benefits |  |  |
Beginning balance | 14 | 14 | 13
Increase in prior period tax positions | 2 | 0 | 1
Settlements with tax authorities | (2) | 0 | 0
Ending balance | 14 | 14 | 14
Of the total, amounts related to tax positions that, if recognized, in future years, would decrease the effective tax rate | (11) | (11) | (11)
Of the total, amounts related to tax positions that, if recognized, in future years, would increase the effective tax rate | 1 | 1 | 1
SoCalGas |  |  |
Reconciliation of Unrecognized Tax Benefits |  |  |
Beginning balance | 77 | 72 | 68
Increase in prior period tax positions | 1 | 1 | 1
Decrease in prior period tax positions | (47) | 0 | 0
Settlements with tax authorities | (2) | 0 | 0
Increase in current period tax positions | 0 | 4 | 3
Ending balance | 29 | 77 | 72
Of the total, amounts related to tax positions that, if recognized, in future years, would decrease the effective tax rate | (29) | (67) | (63)
Of the total, amounts related to tax positions that, if recognized, in future years, would increase the effective tax rate | $ 0 | $ 37 | $ 33

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