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Consolidated Statements of Changes in Equity $ in Millions, $ in Millions | CAD ($) | Issued capital Class A Common Shares CAD ($) | Issued capital Class A Common Shares USD ($) | Issued capital Class B Subordinate Voting Shares CAD ($) | Retained earnings CAD ($) | Contributed surplus CAD ($) | Accumulated other comprehensive income CAD ($) | Non-controlling interests CAD ($) | SSM/SC Retained earnings CAD ($) | SSM/SC Non-controlling interests CAD ($)
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Beginning of year at Dec. 31, 2018 |  | $ 6 |  | $ 6,595 | $ 15,495 | $ 204 | $ 584 | $ 134 |  |
Issued on exercise of options |  |  |  | 13 |  | (3) |  |  |  |
Profit (loss) for the year attributable to shareholders of the company | $ (605) |  |  |  | (605) |  |  |  |  |
Dividends paid (Note 25(g)) |  |  |  |  | (111) |  |  |  |  |
Share repurchases |  |  |  | (285) | (367) |  |  |  |  |
Adjustment from SMM/SC transaction |  |  |  |  |  |  |  |  | $ 4 | $ 675
Remeasurements of retirement benefit plans | (74) |  |  |  | (74) |  | (74) |  |  |
Share option compensation expense (Note 25(c)) |  |  |  |  |  | 18 |  |  |  |
Other comprehensive income (loss) | (201) |  |  |  |  |  | (201) |  |  |
Profit (loss) for the year attributable to non-controlling interests | 17 |  |  |  |  |  |  | 17 |  |
Other comprehensive income (loss) attributable to non-controlling interests | (30) |  |  |  |  |  |  | (30) |  |
Dividends or distributions |  |  |  |  |  |  |  | (26) |  |
End of year at Dec. 31, 2019 | 22,074 |  |  | 6,323 | 14,447 | 219 | 309 | 770 |  |
Issued on exercise of options |  |  |  | 1 |  |  |  |  |  |
Profit (loss) for the year attributable to shareholders of the company | (864) |  |  |  | (864) |  |  |  |  |
Dividends paid (Note 25(g)) |  |  |  |  | (106) |  |  |  |  |
Share repurchases |  |  |  | (190) | (17) |  |  |  |  |
Remeasurements of retirement benefit plans | 50 |  |  |  | 50 |  | 50 |  |  |
Share option compensation expense (Note 25(c)) |  |  |  |  |  | 23 |  |  |  |
Other comprehensive income (loss) | (112) |  |  |  |  |  | (112) |  |  |
Profit (loss) for the year attributable to non-controlling interests | (80) |  |  |  |  |  |  | (80) |  |
Other comprehensive income (loss) attributable to non-controlling interests | (14) |  |  |  |  |  |  | (14) |  |
Dividends or distributions |  |  |  |  |  |  |  | (7) |  |
End of year at Dec. 31, 2020 | $ 20,708 |  | $ 6 | $ 6,134 | $ 13,410 | $ 242 | $ 247 | $ 669 |  |

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