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STOCK OPTION AND STOCK UNIT PLANS (Details) (CAD) In Millions, except Share data, unless otherwise specified |  | 12 Months Ended |  |  | 12 Months Ended
--- | --- | --- | --- | --- | ---
Dec. 31, 2012 item | Dec. 31, 2012 2002 ISO plan | Dec. 31, 2012 2007 ISO and PBSO plans | Dec. 31, 2011 2007 ISO and PBSO plans | Dec. 31, 2007 2007 ISO and PBSO plans | Dec. 31, 2012 PSU Plan and the RSU Plan | Dec. 31, 2012 INCENTIVE STOCK OPTIONS | Dec. 31, 2011 INCENTIVE STOCK OPTIONS | Dec. 31, 2010 INCENTIVE STOCK OPTIONS | Dec. 31, 2012 PERFORMANCE BASED STOCK OPTIONS | Dec. 31, 2011 PERFORMANCE BASED STOCK OPTIONS | Dec. 31, 2010 PERFORMANCE BASED STOCK OPTIONS
STOCK OPTION AND STOCK UNIT PLANS |  |  |  |  |  |  |  |  |  |  |  |
Number of long-term incentive compensation plans | 4 |  |  |  |  |  |  |  |  |  |  |
Maximum number of common shares reserved for issuance under the share-based compensation plan |  | 60,000,000 | 52,000,000 |  | 33,000,000 |  |  |  |  |  |  |
Number of shares issued to date under the share-based compensation plan |  | 46,000,000 | 4,000,000 |  |  |  |  |  |  |  |  |
Increase in number of shares reserved under the share-based compensation plan |  |  |  | 19,000,000 |  |  |  |  |  |  |  |
Number of common shares for each stock unit granted |  |  |  |  |  | 1 |  |  |  |  |  |
Vesting period |  |  |  |  |  |  | 4 years |  |  | 5 years |  |
Expiration term |  |  |  |  |  |  | 10 years |  |  |  |  |
Number |  |  |  |  |  |  |  |  |  |  |  |
Options outstanding at beginning of year (in shares) |  |  |  |  |  |  | 27,465,000 |  |  | 4,127,000 |  |
Options granted (in shares) |  |  |  |  |  |  | 5,802,000 |  |  | 3,543,000 |  |
Options exercised (in shares) |  |  |  |  |  |  | (5,796,000) |  |  | (966,000) |  |
Options cancelled or expired (in shares) |  |  |  |  |  |  | (103,000) |  |  |  |  |
Options outstanding at end of year (in shares) |  |  |  |  |  |  | 27,368,000 | 27,465,000 |  | 6,704,000 | 4,127,000 |
Options vested at end of year (in shares) |  |  |  |  |  |  | 13,703,000 |  |  | 3,061,000 |  |
Weighted Average Exercise Price |  |  |  |  |  |  |  |  |  |  |  |
Options outstanding at beginning of year (in Canadian dollars per share) |  |  |  |  |  |  | 21.19 |  |  | 18.52 |  |
Options granted (in Canadian dollars per share) |  |  |  |  |  |  | 38.32 |  |  | 39.34 |  |
Options exercised (in Canadian dollars per share) |  |  |  |  |  |  | 16.99 |  |  | 18.29 |  |
Options cancelled or expired (in Canadian dollars per share) |  |  |  |  |  |  | 27.78 |  |  |  |  |
Options outstanding at end of year (in Canadian dollars per share) |  |  |  |  |  |  | 25.69 | 21.19 |  | 29.56 | 18.52 |
Options vested at end of year (in Canadian dollars per share) |  |  |  |  |  |  | 20.33 |  |  | 18.54 |  |
Weighted Average Remaining Contractual Life (years) |  |  |  |  |  |  |  |  |  |  |  |
Options outstanding at end of year |  |  |  |  |  |  | 6 years 8 months 12 days |  |  | 5 years 3 months 18 days |  |
Options vested at end of year |  |  |  |  |  |  | 5 years 2 months 12 days |  |  | 2 years 7 months 6 days |  |
Aggregate Intrinsic Value |  |  |  |  |  |  |  |  |  |  |  |
Options outstanding at end of year (in Canadian dollars) |  |  |  |  |  |  | 375 |  |  | 66 |  |
Options vested at end of year (in Canadian dollars) |  |  |  |  |  |  | 261 |  |  | 64 |  |
Stock options, additional disclosures |  |  |  |  |  |  |  |  |  |  |  |
Total intrinsic value of awards exercised (in Canadian dollars) |  |  |  |  |  |  | 130 | 68 | 38 | 20 | 2 | 26
Cash received on exercise of awards (in Canadian dollars) |  |  |  |  |  |  | 69 | 56 | 50 | 12 | 3 | 27
Total fair value of options vested (in Canadian dollars) |  |  |  |  |  |  | 19 | 17 | 14 | 1 | 2 | 2
Total intrinsic value of awards outstanding (in Canadian dollars) |  |  |  |  |  |  | 375 |  |  | 66 |  |

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