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FINANCIAL LIABILITIES - Exchangeable and Class B Shares (Details) - USD ($) $ / shares in Units, $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Disclosure of financial liabilities [line items] |  |  |
Beginning balance, exchangeable and Class B shares | $ 0 |  |
Remeasurement of liability, value | (511) | $ 0 | $ 0
Ending balance, exchangeable and Class B shares | $ 2,221 | $ 0 |
Exchangeable shares outstanding (Shares) |  |  |
Disclosure of financial liabilities [line items] |  |  |
Beginning balance (in shares) | 0 |  |
Share issuance (in shares) | 46,349,323 |  |
Share exchanges (in shares) | (1,388,874) |  |
Remeasurement of Liability (in shares) | 0 |  |
Ending balance (in shares) | 44,960,449 | 0 |
Class B shares outstanding (Shares) |  |  |
Disclosure of financial liabilities [line items] |  |  |
Beginning balance (in shares) | 0 |  |
Share issuance (in shares) | 1 |  |
Share exchanges (in shares) | 0 |  |
Remeasurement of Liability (in shares) | 0 |  |
Ending balance (in shares) | 1 | 0 |
Exchangeable and class B shares (US$ Millions) |  |  |
Disclosure of financial liabilities [line items] |  |  |
Beginning balance, exchangeable and Class B shares | $ 0 |  |
Share issuance, value | 1,765 |  |
Exchangeable share conversion, value | (55) |  |
Remeasurement of liability, value | 511 |  |
Ending balance, exchangeable and Class B shares | $ 2,221 | $ 0 |
Combined share capital |  |  |
Disclosure of financial liabilities [line items] |  |  |
Beginning balance, BIP unit price (in dollars per share) | $ 0 |  |
Number of share issued (in dollars per share) | 38.09 |  |
Number of share exchanges (in dollars per share) | 39.60 |  |
Remeasurement of liability (in dollars per share) | 0 |  |
Ending balance, BIP unit price (in dollars per share) | $ 49.40 | $ 0 |

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