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Post-employment benefit plans - Post-Employment Benefit Plan Assets (Details) - CAD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2021 | Dec. 31, 2020
Disclosure of fair value of plan assets [line items] |  |
Equity securities, total plan assets fair value percent | 16.00% | 23.00%
Debt securities, total plan assets fair value percent | 64.00% | 60.00%
Alternative investments, total plan asset fair value percent | 20.00% | 17.00%
Total plan assets fair value percent | 100.00% | 100.00%
Defined benefit obligation hedged | $ 4,000 |
DB pension |  |
Disclosure of fair value of plan assets [line items] |  |
Plan assets, at fair value | 28,040 | $ 27,785
Equity securities included in total plan assets | $ 3 | $ 3
Equity securities percent included in total plan assets | 0.01% | 0.01%
Debt securities included in total plan assets | $ 85 | $ 141
Debt securities percent included in total plan assets | 0.30% | 0.51%
Alternative investments included in total plan assets | $ 149 | $ 149
Alternative investments percent included in total plan assets | 0.53% | 0.54%
DB pension | Money market |  |
Disclosure of fair value of plan assets [line items] |  |
Debt securities | $ 1,466 | $ 369
DB pension | Private equities |  |
Disclosure of fair value of plan assets [line items] |  |
Alternative investments | 3,123 | 2,564
DB pension | Hedge funds |  |
Disclosure of fair value of plan assets [line items] |  |
Alternative investments | 1,208 | 1,200
DB pension | Real estate |  |
Disclosure of fair value of plan assets [line items] |  |
Alternative investments | 1,429 | 1,033
DB pension | Other |  |
Disclosure of fair value of plan assets [line items] |  |
Alternative investments | 55 | 76
DB pension | Canadian |  |
Disclosure of fair value of plan assets [line items] |  |
Equity securities | 952 | 1,027
DB pension | Canadian | Debt securities, excluding money market |  |
Disclosure of fair value of plan assets [line items] |  |
Debt securities | 13,643 | 13,361
DB pension | Foreign |  |
Disclosure of fair value of plan assets [line items] |  |
Equity securities | 3,436 | 5,242
DB pension | Foreign | Debt securities, excluding money market |  |
Disclosure of fair value of plan assets [line items] |  |
Debt securities | $ 2,728 | $ 2,913
Bottom of range |  |
Disclosure of fair value of plan assets [line items] |  |
Equity securities, weighted average target allocation | 0.00% |
Debt securities, weighted average target allocation | 60.00% |
Alternative investments, weighted average target allocation | 0.00% |
Top of range |  |
Disclosure of fair value of plan assets [line items] |  |
Equity securities, weighted average target allocation | 40.00% |
Debt securities, weighted average target allocation | 100.00% |
Alternative investments, weighted average target allocation | 50.00% |

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