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STOCK OPTION AND STOCK UNIT PLANS - STOCK OPTION ACTIVITY (Details) - INCENTIVE STOCK OPTIONS - CAD ($) $ / shares in Units, shares in Thousands, $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
STOCK OPTION AND STOCK UNIT PLANS |  |  |
Vesting period | 4 years |  |
Expiration term | 10 years |  |
Number |  |  |
Options outstanding at beginning of year (in shares) | 34,366 |  |
Options granted (in shares) | 5,775 |  |
Options exercised (in shares) | (2,519) |  |
Options cancelled or expired (in shares) | (3,235) |  |
Options outstanding at end of year (in shares) | 34,387 | 34,366 |
Options vested at end of year (in shares) | 21,064 |  |
Weighted Average Exercise Price |  |  |
Options outstanding at beginning of year (in dollars per share) | $ 45.41 |  |
Options granted (in dollars per share) | 32.32 |  |
Options exercised (in dollars per share) | 27.11 |  |
Options cancelled or expired (in dollars per share) | 44.11 |  |
Options outstanding at end of year (in dollars per share) | 43.47 | $ 45.41 |
Options vested at end of year (in dollars per share) | $ 43.48 |  |
Weighted Average Remaining Contractual Life (years) |  |  |
Options outstanding at end of year | 6 years 1 month 6 days |  |
Options vested at end of year | 4 years 8 months 12 days |  |
Aggregate Intrinsic Value |  |  |
Options outstanding at end of year | $ 108 |  |
Options vested at end of year | 84 |  |
Stock options, additional disclosures |  |  |
Total intrinsic value of awards exercised | 42 | $ 62 | $ 123
Cash received on exercise of awards | 15 | 17 | 37
Total fair value of options vested | $ 36 | $ 44 | $ 36

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