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STOCK OPTION AND STOCK UNIT PLANS - PERFORMANCE STOCK OPTIONS (Details) CAD / shares in Units, CAD in Millions | 12 Months Ended
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Dec. 31, 2015 CAD item CAD / shares shares | Dec. 31, 2014 CAD CAD / shares shares | Dec. 31, 2012 | Dec. 31, 2008 | Dec. 31, 2007
STOCK OPTION AND STOCK UNIT PLANS |  |  |  |  |
Number of long-term incentive compensation plans | item | 4 |  |  |  |
2002 ISO plan |  |  |  |  |
STOCK OPTION AND STOCK UNIT PLANS |  |  |  |  |
Maximum number of common shares reserved for issuance under the share-based compensation plan | 60,000,000 |  |  |  |
Number of shares issued to date under the share-based compensation plan | 50,000,000 |  |  |  |
2007 ISO and PBSO plans |  |  |  |  |
STOCK OPTION AND STOCK UNIT PLANS |  |  |  |  |
Maximum number of common shares reserved for issuance under the share-based compensation plan | 71,000,000 |  |  |  |
Number of shares issued to date under the share-based compensation plan | 11,000,000 |  |  |  |
Number of shares exercised to date under the share-based compensation plan | 11,000,000 |  |  |  |
PSU Plan and the RSU Plan |  |  |  |  |
STOCK OPTION AND STOCK UNIT PLANS |  |  |  |  |
Number of common shares for each stock unit granted | 1 |  |  |  |
INCENTIVE STOCK OPTIONS |  |  |  |  |
STOCK OPTION AND STOCK UNIT PLANS |  |  |  |  |
Vesting period | 4 years |  |  |  |
Expiration term | 10 years |  |  |  |
Number |  |  |  |  |
Options outstanding at beginning of year (in shares) | 31,330,000 |  |  |  |
Options granted (in shares) | 5,852,000 |  |  |  |
Options exercised (in shares) | (4,224,000) |  |  |  |
Options cancelled or expired (in shares) | (170,000) |  |  |  |
Options outstanding at end of year (in shares) | 32,788,000 | 31,330,000 |  |  |
Options vested at end of year (in shares) | 18,297,000 |  |  |  |
Weighted Average Exercise Price |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price, Beginning Balance | CAD / shares | CAD 34.97 |  |  |  |
Options granted (in Canadian dollars per share) | CAD / shares | 59.14 |  |  |  |
Options exercised (in Canadian dollars per share) | CAD / shares | 26.61 |  |  |  |
Options cancelled or expired (in Canadian dollars per share) | CAD / shares | 44.87 |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price, Ending Balance | CAD / shares | 40.31 | CAD 34.97 |  |  |
Options vested at end of year (in Canadian dollars per share) | CAD / shares | CAD 31.66 |  |  |  |
Weighted Average Remaining Contractual Life (years) |  |  |  |  |
Options outstanding at end of year | 6 years 3 months 18 days |  |  |  |
Options vested at end of year | 4 years 9 months 18 days |  |  |  |
Aggregate Intrinsic Value |  |  |  |  |
Options outstanding at end of year (in Canadian dollars) | CAD | CAD 525 |  |  |  |
Options vested at end of year (in Canadian dollars) | CAD | 451 |  |  |  |
Stock options, additional disclosures |  |  |  |  |
Total intrinsic value of awards exercised (in Canadian dollars) | CAD | 126 | CAD 117 |  |  |
Cash received on exercise of awards (in Canadian dollars) | CAD | 43 | 37 |  |  |
Total fair value of options vested (in Canadian dollars) | CAD | CAD 34 | CAD 26 |  |  |
PERFORMANCE STOCK OPTIONS |  |  |  |  |
STOCK OPTION AND STOCK UNIT PLANS |  |  |  |  |
Vesting period |  | 4 years | 5 years | 5 years | 5 years
Number |  |  |  |  |
Options outstanding at beginning of year (in shares) | 4,511,000 |  |  |  |
Options exercised (in shares) | (830,000) |  |  |  |
Options cancelled or expired (in shares) | (464,000) |  |  |  |
Options outstanding at end of year (in shares) | 3,217,000 | 4,511,000 |  |  |
Options vested at end of year (in shares) | 2,307,000 |  |  |  |
Weighted Average Exercise Price |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price, Beginning Balance | CAD / shares | CAD 35.97 |  |  |  |
Options exercised (in Canadian dollars per share) | CAD / shares | 19.44 |  |  |  |
Options cancelled or expired (in Canadian dollars per share) | CAD / shares | 39.34 |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price, Ending Balance | CAD / shares | 39.75 | CAD 35.97 |  |  |
Options vested at end of year (in Canadian dollars per share) | CAD / shares | CAD 39.48 |  |  |  |
Weighted Average Remaining Contractual Life (years) |  |  |  |  |
Options outstanding at end of year | 3 years 10 months 24 days |  |  |  |
Options vested at end of year | 3 years 8 months 12 days |  |  |  |
Aggregate Intrinsic Value |  |  |  |  |
Options outstanding at end of year (in Canadian dollars) | CAD | CAD 53 |  |  |  |
Options vested at end of year (in Canadian dollars) | CAD | 39 |  |  |  |
Stock options, additional disclosures |  |  |  |  |
Total intrinsic value of awards exercised (in Canadian dollars) | CAD | 43 | CAD 0 |  |  |
Cash received on exercise of awards (in Canadian dollars) | CAD | 13 | 0 |  |  |
Total fair value of options vested (in Canadian dollars) | CAD | CAD 6 | CAD 5 |  |  |

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