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employee future benefits - Employer contributions (Details) - Pension plans - CAD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019
employee future benefits |  |
Undrawn letters of credit that secure obligations | $ 108 | $ 173
Estimated contributions to defined benefit plans in 2021 | $ 51 |

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