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Stock-based Compensatin (Stock Options) (Details) - CAD ($) $ / shares in Units, $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019
Total Options, Number of Options |  |
Total Options: Number of Options, Exercised | (420,000) | (2,570,000)
Non-Vested Options: Weighted average exercise price per share |  |
Non-Vested Options: Weighted average exercise price per share, Granted | $ 3.58 | $ 2.41
Stock option plan, Additional information |  |
Non-Vested options: Unrecognized compensation | $ 2 | $ 2
Non-vested options: Weighted average recognition period | 3 years | 2 years
Vested Options: Weighted average remaining term | 6 years | 6 years
Vested Options: Aggregate intrinsic value | $ 12 | $ 11
Vested Options: Fair value | $ 2 | $ 2
Employee Stock Option Plan |  |
Total Options, Number of Options |  |
Total Options: Number of Options, Outstanding, Beginning Balance | 2,286,550 |
Granted | 501,900 |
Total Options: Number of Options, Exercised | (417,968) |
Total Options: Number of Options, Forfeited | (102,700) |
Total Options: Number of Options, Outstanding, Ending Balance | 2,267,782 | 2,286,550
Total Options: Number of Options, Options exercisable | 973,932 |
Total Options, Weighted average exercise price per share |  |
Total Options: Weighted average exercise price per share, Outstanding, Beginning Balance | $ 43.31 |
Total Options: Weighted average exercise price per share, Granted | 60.03 |
Total Options: Weighted average exercise price per share, Exercised | 44.74 |
Total Options: Weighted average exercise price per share, Forfeited | 45.94 |
Total Options: Weighted average exercise price per share, Outstanding, Ending Balance | 46.62 | $ 43.31
Total Options: Weighted average exercise price per share, Options exercisable | $ 42.08 |
Non-Vested Options, Number of Options |  |
Non-Vested Options: Number of Options, Outstanding, Beginning Balance | 1,549,025 |
Granted | 501,900 |
Non-Vested Options: Number of Options, Vested | 654,375 |
Non-Vested Options: Number of options, Forfeited | (102,700) |
Non-Vested Options: Number of Options, Ending Balance | 1,293,850 | 1,549,025
Non-Vested Options: Weighted average exercise price per share |  |
Non-Vested Options: Weighted average exercise price per share, Outstanding, Beginning Balance | $ 2.22 |
Non-Vested Options: Weighted average exercise price per share, Granted | 3.58 |
Non-Vested Options: Weighted average exercise price per share, Vested | 2.32 |
Non-Vested Options: Weighted average exercise price per share, Forteited | 2.33 |
Non-Vested Options: Weighted average exercise price per share, Outstanding, Ending Balance | $ 2.69 | $ 2.22

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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 Amount of cost to be recognized for option under share-based payment arrangement. + 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 The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan. + 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 (c)(1)(iii) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan. + 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 (c)(1)(iii) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan. + 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 (c)(1)(iv)(3) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology. + 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 (d)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Weighted average remaining contractual term for vested portions of options outstanding and currently exercisable or convertible, 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 -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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