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CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY - CAD ($) shares in Thousands, $ in Millions | Share capital | Contributed surplus | Accumulated other comprehensive income | Retained earnings | Total
--- | --- | --- | --- | --- | ---
Beginning balance at Dec. 31, 2018 | $ 25,910 | $ 540 | $ 1,076 | $ 16,479 | $ 44,005
Beginning balance (in share) at Dec. 31, 2018 |  |  |  |  | 1,584,484
Changes in equity |  |  |  |  |
Net (loss) earnings |  |  |  | 2,899 | $ 2,899
Foreign currency translation adjustment |  |  | (177) |  | (177)
Actuarial loss on employee retirement benefit plans, net of income taxes |  |  |  | (48) | (48)
Total comprehensive (loss) income |  |  | (177) | 2,851 | 2,674
Issued under share option plans | 116 | (24) |  |  | $ 92
Issued under share option plans (in shares) |  |  |  |  | 2,688
Repurchase of common shares for cancellation | (905) |  |  | (1,369) | $ (2,274)
Repurchase of common shares for cancellation (in shares) |  |  |  |  | (55,298)
Change in liability for share purchase commitment | 46 |  |  | 49 | $ 95
Share-based compensation |  | 50 |  |  | 50
Dividends paid on common shares |  |  |  | (2,614) | (2,614)
Ending balance at Dec. 31, 2019 | 25,167 | 566 | 899 | 15,410 | $ 42,042
Ending balance (in share) at Dec. 31, 2019 |  |  |  |  | 1,531,874
Changes in equity |  |  |  |  |
Adoption of IFRS 16 impact |  |  |  | 14 | $ 14
At January 1, 2019, adjusted | 25,910 | 540 | 1,076 | 16,493 | 44,019
Net (loss) earnings |  |  |  | (4,319) | (4,319)
Foreign currency translation adjustment |  |  | (22) |  | (22)
Actuarial loss on employee retirement benefit plans, net of income taxes |  |  |  | (196) | (196)
Total comprehensive (loss) income |  |  | (22) | (4,515) | (4,537)
Issued under share option plans | 36 | (7) |  |  | $ 29
Issued under share option plans (in shares) |  |  |  |  | 804
Repurchase of common shares for cancellation | (124) |  |  | (183) | $ (307)
Repurchase of common shares for cancellation (in shares) |  |  |  |  | (7,527)
Change in liability for share purchase commitment | 65 |  |  | 103 | $ 168
Share-based compensation |  | 32 |  |  | 32
Dividends paid on common shares |  |  |  | (1,670) | (1,670)
Ending balance at Dec. 31, 2020 | $ 25,144 | $ 591 | $ 877 | $ 9,145 | $ 35,757
Ending balance (in share) at Dec. 31, 2020 |  |  |  |  | 1,525,151

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