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STOCK OPTION AND STOCK UNIT PLANS - INCENTIVE PLANS (Details) $ in Millions | 12 Months Ended
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Dec. 31, 2018 CAD ($) compensation_plan shares | Dec. 31, 2017 CAD ($) | Dec. 31, 2016 CAD ($)
STOCK OPTION AND STOCK UNIT PLANS |  |  |
Number of long-term incentive compensation plans | compensation_plan | 4 |  |
Compensation expense | $ | $ 106 | $ 165 | $ 130
2002 ISO plan |  |  |
STOCK OPTION AND STOCK UNIT PLANS |  |  |
Maximum number of common shares reserved for issuance under the share-based compensation plan (in shares) | 60,000,000 |  |
Number of shares issued to date under the share-based compensation plan (in shares) | 50,000,000 |  |
2007 ISO and PSO plans |  |  |
STOCK OPTION AND STOCK UNIT PLANS |  |  |
Maximum number of common shares reserved for issuance under the share-based compensation plan (in shares) | 71,000,000 |  |
Number of shares issued to date under the share-based compensation plan (in shares) | 17,000,000 |  |
PSU and RSU plans |  |  |
STOCK OPTION AND STOCK UNIT PLANS |  |  |
Number of common shares for each stock unit granted (in shares) | 1 |  |

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