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STOCK OPTION AND STOCK UNIT PLANS - PSUs AND RSUs (Details) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2021 CAD ($) shares | Dec. 31, 2020 CAD ($) shares | Dec. 31, 2019 CAD ($)
Stock units, additional disclosures |  |  |
Compensation expense | $ | $ 157 | $ 145 | $ 117
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 | 0.5 | 0.5 | 1.3
Number |  |  |
Units outstanding at beginning of year (in shares) | 3,056,000 |  |
Units granted (in shares) | 1,895,000 |  |
Units cancelled (in shares) | (76,000) |  |
Units matured (in shares) | (1,664,000) |  |
Dividend reinvestment (in shares) | 218,000 |  |
Units outstanding at end of year (in shares) | 3,429,000 | 3,056,000 |
Weighted Average Remaining Contractual Life (years) |  |  |
Units outstanding at end of year | 1 year 1 month 6 days |  |
Aggregate Intrinsic Value |  |  |
Units outstanding at end of year | $ | $ 181 |  |
Stock units, additional disclosures |  |  |
Total amount paid | $ | 70 | $ 14 | $ 19
Compensation expense | $ | 56 | $ 76 | 40
Unrecognized compensation expense related to non-vested units granted | $ | $ 31 |  |
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 | 3 years |  |
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) | 2,453,000 |  |
Units granted (in shares) | 1,514,000 |  |
Units cancelled (in shares) | (75,000) |  |
Units matured (in shares) | (1,433,000) |  |
Dividend reinvestment (in shares) | 246,000 |  |
Units outstanding at end of year (in shares) | 2,705,000 | 2,453,000 |
Weighted Average Remaining Contractual Life (years) |  |  |
Units outstanding at end of year | 1 year 1 month 6 days |  |
Aggregate Intrinsic Value |  |  |
Units outstanding at end of year | $ | $ 129 |  |
Stock units, additional disclosures |  |  |
Total amount paid | $ | 72 | $ 27 | 34
Compensation expense | $ | 85 | $ 44 | $ 41
Unrecognized compensation expense related to non-vested units granted | $ | $ 62 |  |
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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