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FINANCIAL RISK MANAGEMENT FINANCIAL RISK MANAGEMENT - Capital Structure (Details) - USD ($) $ in Millions | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
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Financial Instruments [Abstract] |  |  |  |
Corporate borrowings | $ 1,993 | $ 2,101 |  |
Non-recourse Borrowings | 13,113 | 8,063 |  |
Subsidiary and corporate borrowings | 15,106 | 10,164 |  |
Preferred shares | 20 | 20 |  |
Cash and cash equivalents | (713) | (459) |  |
Net debt | 14,413 | 9,725 |  |
Total partnership capital | 14,668 | 13,474 | $ 9,644 | $ 7,176
Total capital and net debt | $ 29,081 | $ 23,199 |  |
Net debt to capitalization ratio | 50.00% | 42.00% |  |

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