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DISPOSITION OF BUSINESSES Disposition of Businesses - Additional Information (Details) - USD ($) $ in Millions |  |  | 3 Months Ended | 6 Months Ended
--- | --- | --- | --- | ---
Jun. 07, 2021 | May 12, 2021 | Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020
Disclosure of subsidiaries [line items] |  |  |  |  |  |
Proceeds From Partial Disposition Of Subsidiaries To Non-Controlling Interest, Net Of Taxes |  |  | $ 0 | $ 0 | $ 0 | $ 168
U.K. regulated distribution business |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |
Gain (Loss) on Disposition of Business |  | $ 195 |  |  |  |
Increase (decrease) through transfer between revaluation surplus and retained earnings, equity |  | 142 |  |  |  |
Reclassification adjustments on exchange differences on translation, net of tax |  | 12 |  |  |  |
Proceeds from Disposition of Subsidiary |  | 340 |  |  |  |
U.K. regulated distribution business | Consortium |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |
Gain (Loss) on Disposition of Business |  | 155 |  |  |  |
Proceeds from Disposition of Subsidiary |  | $ 820 |  |  |  |
Canadian district energy operations |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |
Gain (Loss) on Disposition of Business | $ 295 |  |  |  |  |
Increase (decrease) through transfer between revaluation surplus and retained earnings, equity | 124 |  |  |  |  |
Reclassification adjustments on exchange differences on translation, net of tax | $ 9 |  |  |  |  |
Disposal of ownership interest, percentage | 25.00% |  |  |  |  |
Proceeds from Disposition of Subsidiary | $ 450 |  |  |  |  |
Canadian district energy operations | Consortium |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |
Gain (Loss) on Disposition of Business | 1,170 |  |  |  |  |
Proceeds from Disposition of Subsidiary | $ 1,770 |  |  |  |  |

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