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CAPITAL DISCLOSURES (Details) - CAD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Disclosure of objectives, policies and processes for managing capital [line items] |  |  |
Long-term debt, net | $ 22,321 | $ 16,788 |
Equity | $ 31,653 | $ 26,267 | $ 27,381
Debt to book capitalization | 41.00% | 39.00% |
Bottom of range |  |  |
Disclosure of objectives, policies and processes for managing capital [line items] |  |  |
Debt to book capitalization | 25.00% |  |
Top of range |  |  |
Disclosure of objectives, policies and processes for managing capital [line items] |  |  |
Debt to book capitalization | 45.00% |  |

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