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STOCK OPTION AND STOCK UNIT PLANS - WEIGHTED AVERAGE ASSUMPTIONS (Details) $ / shares in Units, $ in Millions | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2020 CAD ($) $ / shares | Dec. 31, 2019 CAD ($) $ / shares | Dec. 31, 2018 CAD ($) $ / shares | Dec. 31, 2020 $ / shares | Dec. 31, 2019 $ / shares | Dec. 31, 2018 $ / shares
Weighted average assumptions used to determine the fair value of options |  |  |  |  |  |
Compensation expense | $ | $ 145 | $ 117 | $ 106 |  |  |
INCENTIVE STOCK OPTIONS |  |  |  |  |  |
Weighted average assumptions used to determine the fair value of options |  |  |  |  |  |
Fair value per option (in dollars per share) | $ / shares | $ 4.01 | $ 4.37 | $ 3.86 |  |  |
Expected option term (in years) | 6 years | 5 years | 5 years |  |  |
Expected volatility (as a percent) | 18.30% | 19.90% | 21.90% |  |  |
Expected dividend yield (as a percent) | 5.90% | 6.10% | 6.40% |  |  |
Risk-free interest rate (as a percent) | 1.30% | 2.00% | 2.20% |  |  |
Expected option term - historical exercise practice | 6 years |  |  |  |  |
Compensation expense | $ | $ 24 | $ 32 | $ 28 |  |  |
Unrecognized compensation cost related to non-vested share-based compensation arrangements granted | $ | $ 13 |  |  |  |  |
Weighted average period over which compensation cost is expected to be recognized | 2 years |  |  |  |  |
INCENTIVE STOCK OPTIONS | Canadian employees |  |  |  |  |  |
Weighted average assumptions used to determine the fair value of options |  |  |  |  |  |
Fair value per option (in dollars per share) | $ / shares | $ 3.75 | $ 4.04 | $ 3.75 |  |  |
INCENTIVE STOCK OPTIONS | United States employees |  |  |  |  |  |
Weighted average assumptions used to determine the fair value of options |  |  |  |  |  |
Fair value per option (in dollars per share) | $ / shares |  |  |  | $ 3.62 | $ 4.09 | $ 3.30
INCENTIVE STOCK OPTIONS | Retirement-eligible employees |  |  |  |  |  |
Weighted average assumptions used to determine the fair value of options |  |  |  |  |  |
Expected option term (in years) | 5 years |  |  |  |  |

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- Definition Amount of expense for award under share-based payment arrangement. Excludes amount capitalized. + 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=120381028&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=120381028&loc=d3e5070-113901 + Details
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- Definition Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents 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 (i) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Agreed-upon price for the exchange of the underlying asset relating to the share-based payment award. + References No definition available. + Details
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- Definition The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term. + 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 (f)(2)(iii) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition The estimated measure of the percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period. + 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 (f)(2)(ii) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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