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Post-employee benefit plans - Post-Employment Benefit Plan Assets (Details) - CAD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019
Disclosure of fair value of plan assets [line items] |  |
Equity securities, total plan assets fair value percent | 23.00% | 22.00%
Debt securities, total plan assets fair value percent | 60.00% | 62.00%
Alternative investments, total plan asset fair value percent | 17.00% | 16.00%
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 | 27,785 | $ 25,530
Equity securities included in total plan assets | $ 3 | $ 15
Equity securities percent included in total plan assets | 0.01% | 0.06%
Debt securities included in total plan assets | $ 141 | $ 53
Debt securities percent included in total plan assets | 0.51% | 0.21%
Alternative investments included in total plan assets | $ 149 | $ 135
Alternative investments percent included in total plan assets | 0.54% | 0.53%
DB pension | Money market |  |
Disclosure of fair value of plan assets [line items] |  |
Debt securities | $ 369 | $ 219
DB pension | Private equities |  |
Disclosure of fair value of plan assets [line items] |  |
Alternative investments | 2,564 | 2,119
DB pension | Hedge funds |  |
Disclosure of fair value of plan assets [line items] |  |
Alternative investments | 1,200 | 1,001
DB pension | Real estate |  |
Disclosure of fair value of plan assets [line items] |  |
Alternative investments | 1,033 | 948
DB pension | Other |  |
Disclosure of fair value of plan assets [line items] |  |
Alternative investments | 76 | 91
DB pension | Canadian |  |
Disclosure of fair value of plan assets [line items] |  |
Equity securities | 1,027 | 1,017
DB pension | Canadian | Debt securities, excluding money market |  |
Disclosure of fair value of plan assets [line items] |  |
Debt securities | 13,361 | 13,216
DB pension | Foreign |  |
Disclosure of fair value of plan assets [line items] |  |
Equity securities | 5,242 | 4,534
DB pension | Foreign | Debt securities, excluding money market |  |
Disclosure of fair value of plan assets [line items] |  |
Debt securities | $ 2,913 | $ 2,385
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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