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FINANCIAL RISK MANAGEMENT - Capital Structure (Details) - USD ($) $ in Millions | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | --- | --- | ---
Financial Instruments [Abstract] |  |  |  |
Non-recourse borrowings | $ 3,556 | $ 3,477 |  |
Cash and cash equivalents | (469) | (192) |  |
Net debt | 3,087 | 3,285 |  |
Exchangeable and class B shares | 4,466 | 2,221 |  |
Loans payable to Brookfield Infrastructure | 0 | 1,143 |  |
Loans payable to Brookfield Infrastructure | 131 | 0 |  |
Total equity | (1,424) | (572) | $ 3,277 | $ 3,249
Total capital and net debt | $ 6,260 | $ 6,077 |  |
Net debt to capitalization ratio | 49.00% | 54.00% |  |

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