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STOCK OPTION AND STOCK UNIT PLANS - PSUs AND RSUs (Details) shares in Thousands, $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 CAD ($) shares | Dec. 31, 2018 CAD ($) shares | Dec. 31, 2017 CAD ($)
Stock units, additional disclosures |  |  |
Compensation expense | $ | $ 117 | $ 106 | $ 165
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 |  |
Number |  |  |
Units outstanding at beginning of year (in shares) | 1,069 |  |
Units granted (in shares) | 1,093 |  |
Units cancelled (in shares) | (65) |  |
Units matured (in shares) | (25) |  |
Dividend reinvestment (in shares) | 117 |  |
Units outstanding at end of year (in shares) | 2,189 | 1,069 |
Weighted Average Remaining Contractual Life (years) |  |  |
Units outstanding at end of year | 1 year 6 months |  |
Aggregate Intrinsic Value |  |  |
Units outstanding at end of year | $ | $ 111 |  |
Stock units, additional disclosures |  |  |
Total amount paid | $ | 19 | $ 18 | 28
Compensation expense | $ | 40 | $ 15 | 5
Unrecognized compensation expense related to non-vested units granted | $ | $ 55 |  |
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) | 1,213 |  |
Units granted (in shares) | 1,087 |  |
Units cancelled (in shares) | (96) |  |
Units matured (in shares) | (706) |  |
Dividend reinvestment (in shares) | 126 |  |
Units outstanding at end of year (in shares) | 1,624 | 1,213 |
Weighted Average Remaining Contractual Life (years) |  |  |
Units outstanding at end of year | 1 year 7 months 6 days |  |
Aggregate Intrinsic Value |  |  |
Units outstanding at end of year | $ | $ 82 |  |
Stock units, additional disclosures |  |  |
Total amount paid | $ | 34 | $ 41 | 39
Compensation expense | $ | 41 | $ 32 | $ 46
Unrecognized compensation expense related to non-vested units granted | $ | $ 47 |  |
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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