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STOCK OPTION AND STOCK UNIT PLANS - STOCK OPTION ACTIVITY (Details) - CAD ($) $ / shares in Units, shares in Thousands, $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
STOCK OPTION AND STOCK UNIT PLANS |  |  |
Compensation expense | $ 145 | $ 117 | $ 106
INCENTIVE STOCK OPTIONS |  |  |
STOCK OPTION AND STOCK UNIT PLANS |  |  |
Compensation expense | $ 24 | $ 32 | 28
Vesting period | 4 years |  |
Expiration term | 10 years |  |
Number |  |  |
Options outstanding at beginning of year (in shares) | 35,047 |  |
Options granted (in shares) | 4,783 |  |
Options exercised (in shares) | (2,656) |  |
Options cancelled or expired (in shares) | (1,680) |  |
Options outstanding at end of year (in shares) | 35,494 | 35,047 |
Options vested at end of year (in shares) | 22,005 |  |
Weighted Average Exercise Price |  |  |
Options outstanding at beginning of year (in dollars per share) | $ 47.73 |  |
Options granted (in dollars per share) | 55.50 |  |
Options exercised (in dollars per share) | 37.12 |  |
Options cancelled or expired (in dollars per share) | 52.43 |  |
Options outstanding at end of year (in dollars per share) | 49.35 | $ 47.73 |
Options vested at end of year (in dollars per share) | $ 48.65 |  |
Weighted Average Remaining Contractual Life (years) |  |  |
Options outstanding at end of year | 6 years |  |
Options vested at end of year | 4 years 7 months 6 days |  |
Aggregate Intrinsic Value |  |  |
Options outstanding at end of year | $ 54 |  |
Options vested at end of year | 34 |  |
Stock options, additional disclosures |  |  |
Total intrinsic value of awards exercised | 13 | $ 58 | 42
Cash received on exercise of awards | 4 | 1 | 15
Total fair value of options vested | $ 30 | $ 32 | $ 36

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