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CHANGES IN ACCOUNTING POLICIES (Details) - CAD ($) $ in Millions | Jan. 01, 2019 | Dec. 31, 2019
--- | --- | ---
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |
Operating lease right-of-use assets | $ 771 | $ 713
Operating lease liabilities | 856 | $ 783
Pre-existing liabilities related to impaired lease | $ 85 |
Weighted average discount rate (percent) | 4.32% | 4.30%
ASU 2016-02 (Topic 842) |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |
Operating lease right-of-use assets | $ 771 |
Operating lease liabilities | $ 771 |

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