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CHANGES IN ACCOUNTING POLICIES (Details) - CAD ($) $ in Millions | Jan. 01, 2019 | Sep. 30, 2019
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New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |
Operating lease right-of-use assets, net | $ 771 | $ 733
Operating lease liability | 856 | $ 804
Lease impairment | $ 85 |
Weighted average discount rate, percent | 4.30% | 4.30%
Accounting Standards Update 2016-02 |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |
Operating lease right-of-use assets, net | $ 771 |
Operating lease liability | $ 771 |
Weighted average discount rate, percent | 4.32% |

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