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STOCK OPTION AND STOCK UNIT PLANS - PSUs AND RSUs (Details) shares in Thousands, $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 CAD ($) shares | Dec. 31, 2019 CAD ($) shares | Dec. 31, 2018 CAD ($)
Stock units, additional disclosures |  |  |
Compensation expense | $ | $ 145 | $ 117 | $ 106
Performance Stock Units (PSUs) |  |  |
STOCK OPTION AND STOCK UNIT PLANS |  |  |
Performance / maturity period | 3 years |  |
Period prior to the maturity of the grant for which weighted average share price is used to calculate cash awards | 20 days |  |
Performance multiplier | 1.5 | 1.0 | 1.8
Number |  |  |
Units outstanding at beginning of year (in shares) | 2,189 |  |
Units granted (in shares) | 1,034 |  |
Units cancelled (in shares) | (154) |  |
Units matured (in shares) | (219) |  |
Dividend reinvestment (in shares) | 206 |  |
Units outstanding at end of year (in shares) | 3,056 | 2,189 |
Weighted Average Remaining Contractual Life (years) |  |  |
Units outstanding at end of year | 2 years 2 months 12 days |  |
Aggregate Intrinsic Value |  |  |
Units outstanding at end of year | $ | $ 129 |  |
Stock units, additional disclosures |  |  |
Total amount paid | $ | 14 | $ 19 | $ 18
Compensation expense | $ | 76 | $ 40 | 15
Unrecognized compensation expense related to non-vested units granted | $ | $ 46 |  |
Weighted average period over which compensation cost is expected to be recognized | 2 years |  |
Restricted Stock Units (RSU) |  |  |
STOCK OPTION AND STOCK UNIT PLANS |  |  |
Performance / maturity period | 35 months |  |
Period prior to the maturity of the grant for which weighted average share price is used to calculate cash awards | 20 days |  |
Number |  |  |
Units outstanding at beginning of year (in shares) | 1,624 |  |
Units granted (in shares) | 1,281 |  |
Units cancelled (in shares) | (87) |  |
Units matured (in shares) | (561) |  |
Dividend reinvestment (in shares) | 196 |  |
Units outstanding at end of year (in shares) | 2,453 | 1,624 |
Weighted Average Remaining Contractual Life (years) |  |  |
Units outstanding at end of year | 2 years 6 months |  |
Aggregate Intrinsic Value |  |  |
Units outstanding at end of year | $ | $ 104 |  |
Stock units, additional disclosures |  |  |
Total amount paid | $ | 27 | $ 34 | 41
Compensation expense | $ | 44 | $ 41 | $ 32
Unrecognized compensation expense related to non-vested units granted | $ | $ 50 |  |
Weighted average period over which compensation cost is expected to be recognized | 2 years |  |
Minimum | Performance Stock Units (PSUs) |  |  |
STOCK OPTION AND STOCK UNIT PLANS |  |  |
Performance multiplier | 0 |  |
Maximum | Performance Stock Units (PSUs) |  |  |
STOCK OPTION AND STOCK UNIT PLANS |  |  |
Performance multiplier | 2 |  |

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