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Consolidated Statements of Changes in Equity - CAD ($) $ in Millions | Total | AOSP | Share capital | Retained earnings | Accumulated other comprehensive income (loss)
--- | --- | --- | --- | --- | ---
Balance – beginning of year at Dec. 31, 2016 |  |  |  | $ 4,671 | $ 21,526 | $ 70
Issued upon exercise of stock options |  |  |  | 466 |  |
Previously recognized liability on stock options exercised for common shares |  |  |  | 154 |  |
Purchase of common shares under Normal Course Issuer Bid |  |  |  | 0 | 0 |
Issued for the acquisition of AOSP and other assets | [1] |  |  | 3,818 |  |
Net earnings |  | $ 2,397 |  |  | 2,397 |
Dividends on common shares |  |  |  |  | (1,311) |
Other comprehensive income (loss), net of taxes |  | (138) |  |  |  | (138)
Balance – end of year at Dec. 31, 2017 |  | 31,653 |  | 9,109 | 22,612 | (68)
Non-cash share considerations issued on the acquisition of AOSP and other assets |  |  | $ 3,818 |  |  |
Issued upon exercise of stock options |  |  |  | 332 |  |
Previously recognized liability on stock options exercised for common shares |  |  |  | 120 |  |
Purchase of common shares under Normal Course Issuer Bid |  |  |  | (238) | (1,044) |
Issued for the acquisition of AOSP and other assets | [1] |  |  | 0 |  |
Net earnings |  | 2,591 |  |  | 2,591 |
Dividends on common shares |  |  |  |  | (1,630) |
Other comprehensive income (loss), net of taxes |  | 190 |  |  |  | 190
Balance – end of year at Dec. 31, 2018 |  | 31,974 |  | 9,323 | 22,529 | 122
Issued upon exercise of stock options |  |  |  | 360 |  |
Previously recognized liability on stock options exercised for common shares |  |  |  | 53 |  |
Purchase of common shares under Normal Course Issuer Bid |  | (941) |  | (203) | (738) |
Issued for the acquisition of AOSP and other assets | [1] |  |  | 0 |  |
Net earnings |  | 5,416 |  |  | 5,416 |
Dividends on common shares |  |  |  |  | (1,783) |
Other comprehensive income (loss), net of taxes |  | (88) |  |  |  | (88)
Balance – end of year at Dec. 31, 2019 |  | $ 34,991 |  | $ 9,533 | $ 25,424 | $ 34
[1] | During 2017, in connection with the acquisition of direct and indirect interests in the Athabasca Oil Sands Project ("AOSP") and other assets, the Company issued non-cash share consideration of $3,818 million (see note 7).

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