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STOCK OPTION AND STOCK UNIT PLANS - PSUs AND RSUs (Details) shares in Thousands, CAD in Millions | 12 Months Ended
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Dec. 31, 2016 CAD item shares | Dec. 31, 2015 CAD shares | Dec. 31, 2014 CAD
PERFORMANCE STOCK UNITS |  |  |
STOCK OPTION AND STOCK UNIT PLANS |  |  |
Vesting period | 3 years |  |
Period prior to the maturity of the grant for which weighted average share price is used to calculate cash awards | 20 days |  |
Performance multiplier | item | 2 |  |
Number |  |  |
Units outstanding at beginning of year (in shares) | 536 |  |
Units granted (in shares) | 294 |  |
Units cancelled (in shares) | (14) |  |
Units matured (in shares) | (295) |  |
Dividend reinvestment (in shares) | 35 |  |
Units outstanding at end of year (in shares) | 556 | 536 |
Weighted Average Remaining Contractual Life (years) |  |  |
Units outstanding at end of year | 1 year 6 months |  |
Aggregate Intrinsic Value |  |  |
Units outstanding at end of year (in Canadian dollars) | CAD | CAD 54 |  |
Stock units, additional disclosures |  |  |
Total amount paid (in Canadian dollars) | CAD | 22 | CAD 35 | CAD 36
Compensation expense (in Canadian dollars) | CAD | 33 | CAD 12 | 40
Unrecognized compensation expense related to non-vested units granted (in Canadian dollars) | CAD | CAD 30 |  |
Weighted average period over which compensation cost is expected to be recognized | 2 years |  |
PERFORMANCE STOCK UNITS | Minimum |  |  |
STOCK OPTION AND STOCK UNIT PLANS |  |  |
Performance multiplier | item | 0 |  |
PERFORMANCE STOCK UNITS | Maximum |  |  |
STOCK OPTION AND STOCK UNIT PLANS |  |  |
Performance multiplier | item | 2 |  |
Restricted Stock Units (RSU) |  |  |
STOCK OPTION AND STOCK UNIT PLANS |  |  |
Vesting period | 35 months |  |
Period prior to the maturity of the grant for which weighted average share price is used to calculate cash awards | 20 days |  |
Number |  |  |
Units outstanding at beginning of year (in shares) | 1,906 |  |
Units granted (in shares) | 972 |  |
Units cancelled (in shares) | (154) |  |
Units matured (in shares) | (992) |  |
Dividend reinvestment (in shares) | 122 |  |
Units outstanding at end of year (in shares) | 1,854 | 1,906 |
Weighted Average Remaining Contractual Life (years) |  |  |
Units outstanding at end of year | 1 year 4 months 24 days |  |
Aggregate Intrinsic Value |  |  |
Units outstanding at end of year (in Canadian dollars) | CAD | CAD 105 |  |
Stock units, additional disclosures |  |  |
Total amount paid (in Canadian dollars) | CAD | 56 | CAD 45 | 45
Compensation expense (in Canadian dollars) | CAD | 51 | CAD 47 | CAD 44
Unrecognized compensation expense related to non-vested units granted (in Canadian dollars) | CAD | CAD 62 |  |
Weighted average period over which compensation cost is expected to be recognized | 1 year |  |

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- Definition Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 14.F) -URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(3) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Amount of cash paid related to share-based compensation liabilities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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