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STOCK OPTION AND STOCK UNIT PLANS - STOCK OPTION ACTIVITY (Details) $ / shares in Units, shares in Thousands, $ in Millions | 12 Months Ended
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Dec. 31, 2021 CAD ($) compensationPlan $ / shares shares | Dec. 31, 2020 CAD ($) $ / shares shares | Dec. 31, 2019 CAD ($)
STOCK OPTION AND STOCK UNIT PLANS |  |  |
Number of long-term incentive compensation plans | compensationPlan | 3 |  |
Compensation expense | $ 157 | $ 145 | $ 117
INCENTIVE STOCK OPTIONS |  |  |
STOCK OPTION AND STOCK UNIT PLANS |  |  |
Compensation expense | $ 16 | $ 24 | 32
Vesting period | 4 years |  |
Expiration term | 10 years |  |
Number |  |  |
Options outstanding at beginning of year (in shares) | shares | 35,494 |  |
Options granted (in shares) | shares | 4,072 |  |
Options exercised (in shares) | shares | (4,142) |  |
Options cancelled or expired (in shares) | shares | (1,407) |  |
Options outstanding at end of year (in shares) | shares | 34,017 | 35,494 |
Options vested at end of year (in shares) | shares | 22,029 |  |
Weighted Average Exercise Price |  |  |
Options outstanding at beginning of year (in dollars per share) | $ / shares | $ 48.65 |  |
Options granted (in dollars per share) | $ / shares | 43.86 |  |
Options exercised (in dollars per share) | $ / shares | 41.85 |  |
Options cancelled or expired (in dollars per share) | $ / shares | 50.74 |  |
Options outstanding at end of year (in dollars per share) | $ / shares | 49.28 | $ 48.65 |
Options vested at end of year (in dollars per share) | $ / shares | $ 49.84 |  |
Weighted Average Remaining Contractual Life (years) |  |  |
Options outstanding at end of year | 5 years 8 months 12 days |  |
Options vested at end of year | 4 years 6 months |  |
Aggregate Intrinsic Value |  |  |
Options outstanding at end of year | $ 128 |  |
Options vested at end of year | 64 |  |
Stock options, additional disclosures |  |  |
Total intrinsic value of awards exercised | 24 | $ 13 | 58
Cash received on exercise of awards | 2 | 4 | 1
Total fair value of options vested | $ 25 | $ 30 | $ 32

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