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PARTIAL DISPOSITION OF OUR INTEREST IN CHILEAN TOLL ROAD BUSINESS - Additional Information (Details) - USD ($) $ in Millions |  | 3 Months Ended | 6 Months Ended
--- | --- | --- | ---
Feb. 07, 2019 | Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Disclosure Of Associates And Joint Ventures [Line Items] |  |  |  |  |
Proceeds from sales of investments accounted for using equity method |  | $ 135 | $ 0 | $ 135 | $ 1,289
Gain (Loss) on Disposition of Business |  | $ 0 | $ 0 | 0 | $ 338
Chilean toll roads |  |  |  |  |
Disclosure Of Associates And Joint Ventures [Line Items] |  |  |  |  |
Ownership and Voting Interest Held In Associate And Joint Venture | 17.00% |  |  |  |
Proceeds from sales of investments accounted for using equity method | $ 365 |  |  |  |
Dividends received | 200 |  |  |  |
Partnership's share of proceeds from sales of investments accounted for using equity method | $ 165 |  |  |  |
Gain (Loss) on Disposition of Business |  |  |  | 354 |
Reclassification adjustments on exchange differences on translation, net of tax |  |  |  | $ 38 |

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