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STOCK OPTION AND STOCK UNIT PLANS - PSUs AND RSUs (Details) - CAD ($) shares in Thousands, $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Stock units, additional disclosures |  |  |
Compensation expense | $ 106 | $ 165 | $ 130
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) | 1,693 |  |
Units granted (in shares) | 542 |  |
Units cancelled (in shares) | (191) |  |
Units matured (in shares) | (971) |  |
Dividend reinvestment (in shares) | 140 |  |
Units outstanding at end of year (in shares) | 1,213 | 1,693 |
Weighted Average Remaining Contractual Life (years) |  |  |
Units outstanding at end of year | 1 year 3 months 19 days |  |
Aggregate Intrinsic Value |  |  |
Units outstanding at end of year | $ 52 |  |
Stock units, additional disclosures |  |  |
Total amount paid | 41 | $ 39 | 56
Compensation expense | 32 | $ 46 | $ 51
Unrecognized compensation expense related to non-vested units granted | $ 26 |  |
Weighted average period over which compensation cost is expected to be recognized | 2 years |  |

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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5047-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -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=115993241&loc=d3e301413-122809 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -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=109197908&loc=d3e5070-113901 + Details
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- Definition Weighted average remaining contractual term for equity-based awards excluding options, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e)(1) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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