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Share Capital (Tables) | 12 Months Ended
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Dec. 31, 2020
Disclosure Of Classes Of Share Capital [Abstract] |
Summary of Share Capital | B) Issued and Outstanding
| 2020 |  |  | 2019 |
As at December 31, | Number of Common Shares (thousands) |  |  | Amount |  |  | Number of Common Shares (thousands) |  |  | Amount |
Outstanding, Beginning of Year |  | 1,228,828 |  |  |  | 11,040 |  |  |  | 1,228,790 |  |  |  | 11,040 |
Common Shares Issued Under Stock Option Plan (Note 32) |  | 42 |  |  |  | - |  |  |  | 38 |  |  | - |
Outstanding, End of Year |  | 1,228,870 |  |  |  | 11,040 |  |  |  | 1,228,828 |  |  |  | 11,040 |
Disclosure Of Paid In Surplus Includes Stock Based Compensation Expense Explanatory | Cenovus’s paid in surplus reflects the Company’s retained earnings prior to the split of Encana Corporation (“Encana”) under the plan of arrangement into two independent energy companies, Encana (now known as Ovintiv Inc.) and Cenovus (pre-arrangement earnings). In addition, paid in surplus includes stock-based compensation expense related to the Company’s NSRs discussed in Note 32A.
| Pre-Arrangement Earnings |  |  | Stock-Based Compensation |  |  | Total |
As at December 31, 2018 |  | 4,086 |  |  |  | 281 |  |  |  | 4,367 |
Stock-Based Compensation Expense |  | - |  |  |  | 10 |  |  |  | 10 |
As at December 31, 2019 |  | 4,086 |  |  |  | 291 |  |  |  | 4,377 |
Stock-Based Compensation Expense |  | - |  |  |  | 14 |  |  |  | 14 |
As at December 31, 2020 |  | 4,086 |  |  |  | 305 |  |  |  | 4,391 |

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