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OTHER CONTINGENCIES AND COMMITMENTS (Tax Matters) (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020 | Dec. 31, 2020
Disaggregation of Revenue [Line Items] |  |  |  |  |
Decrease in net operating loss | $ (304) | $ (398) | $ (1,242) | $ (1,335) |
Fire Victim Trust |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Cash transferred |  |  |  |  | $ 5,400
Common stock transferred |  |  |  |  | 4,540
Aggregate transferred |  |  |  |  | 10,000
Decrease in net operating loss |  |  |  |  | 10,000
Deferred tax assets charge |  |  |  |  | $ 1,300

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