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FINANCIAL RISK MANAGEMENT FINANCIAL RISK MANAGEMENT - Capital Structure (Details) - USD ($) $ in Millions | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
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Financial Instruments [Abstract] |  |  |  |
Subsidiary and corporate borrowings | $ 10,164 | $ 8,326 |  |
Preferred shares | 20 | 20 |  |
Cash and cash equivalents | (459) | (789) |  |
Total partnership capital | 9,725 | 7,557 |  |
Total partnership capital | 13,474 | 9,644 | $ 7,176 | $ 6,322
Total capital and net debt | $ 23,199 | $ 17,201 |  |
Net debt to capitalization ratio | 42.00% | 44.00% |  |

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