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DISPOSITION OF BUSINESSES Disposition of Businesses - Additional Information (Details) - USD ($) $ in Millions |  |  | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
Feb. 06, 2020 | Jan. 14, 2020 | Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019 | Feb. 15, 2020 | Feb. 07, 2019
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |
Proceeds From Partial Disposition Of Subsidiaries To Non-Controlling Interest, Net Of Taxes |  |  | $ 0 | $ 0 | $ 168 | $ 165 |  |
Colombian Regulated Distribution Operation [Member] |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |
Disposal of ownership interest, percentage |  | 17.00% |  |  |  |  |  |
Proceeds from Disposition of Subsidiary |  | $ 88 |  |  |  |  |  |
Gain (Loss) on Disposition of Business |  | 36 |  |  |  |  |  |
Increase (decrease) through transfer between revaluation surplus and retained earnings, equity |  |  |  |  | 61 |  |  |
Reclassification adjustments on cash flow hedges, net of tax |  | 44 |  |  |  |  |  |
Chilean toll roads |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |
Disposal of ownership interest, percentage | 33.00% |  |  |  |  |  |  | 33.00%
Gain (Loss) on Disposition of Business | $ 140 |  |  |  |  |  |  |
Reclassification adjustments on cash flow hedges, net of tax |  |  |  |  | 44 | $ 38 |  |
Proceeds From Partial Disposition Of Subsidiaries To Non-Controlling Interest, Net Of Taxes | $ 170 |  |  |  |  |  |  |
North American Rail Operation |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |
Disposal of ownership interest, percentage |  |  |  |  |  |  | 51.00% |
Proceeds from Disposition of Subsidiary |  |  |  |  |  |  | $ 40 |
Gain (Loss) on Disposition of Business |  |  |  |  | $ 0 |  |  |
Deferred consideration, acquisition-date fair value |  |  |  |  |  |  | 195 |
Consortium | Colombian Regulated Distribution Operation [Member] |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |
Proceeds from Disposition of Subsidiary |  | 495 |  |  |  |  |  |
Gain (Loss) on Disposition of Business |  | $ 197 |  |  |  |  |  |
Consortium | North American Rail Operation |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |
Proceeds from Disposition of Subsidiary |  |  |  |  |  |  | $ 420 |

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