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Post-employment benefit plans - Post-Employment Benefit Plan Assets (Details) - CAD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2023 | Dec. 31, 2022
Disclosure of fair value of plan assets [line items] |  |
Equity securities, total plan assets fair value percent | 13.00% | 15.00%
Debt securities, total plan assets fair value percent | 55.00% | 52.00%
Alternative investments, total plan asset fair value percent | 32.00% | 33.00%
Total plan assets fair value percent | 100.00% | 100.00%
Liabilities | $ 51,383 | $ 46,814
Defined benefit obligation hedged | 3,000 |
MLSE financial liability |  |
Disclosure of fair value of plan assets [line items] |  |
Liabilities | 149 | 149
DB pension |  |
Disclosure of fair value of plan assets [line items] |  |
Plan assets, at fair value | 23,768 | 23,355
Equity securities included in total plan assets | $ 9 | $ 11
Equity securities percent included in total plan assets | 0.04% | 0.05%
Debt securities included in total plan assets | $ 92 | $ 85
Debt securities percent included in total plan assets | 0.39% | 0.40%
Alternative investments included in total plan assets |  | $ 149
Alternative investments percent included in total plan assets |  | 0.64%
DB pension | Money market |  |
Disclosure of fair value of plan assets [line items] |  |
Debt securities | $ 1,222 | $ 739
DB pension | Private equities |  |
Disclosure of fair value of plan assets [line items] |  |
Alternative investments | 831 | 1,017
DB pension | Hedge funds |  |
Disclosure of fair value of plan assets [line items] |  |
Alternative investments | 1,268 | 1,374
DB pension | Real estate and infrastructure |  |
Disclosure of fair value of plan assets [line items] |  |
Alternative investments | 4,221 | 4,297
DB pension | Private Debt |  |
Disclosure of fair value of plan assets [line items] |  |
Alternative investments | 1,237 | 1,048
DB pension | Other |  |
Disclosure of fair value of plan assets [line items] |  |
Alternative investments | 32 | 60
DB pension | Canadian |  |
Disclosure of fair value of plan assets [line items] |  |
Equity securities | 858 | 824
DB pension | Canadian | Debt securities, excluding money market |  |
Disclosure of fair value of plan assets [line items] |  |
Debt securities | 10,284 | 9,904
DB pension | Foreign |  |
Disclosure of fair value of plan assets [line items] |  |
Equity securities | 2,265 | 2,555
DB pension | Foreign | Debt securities, excluding money market |  |
Disclosure of fair value of plan assets [line items] |  |
Debt securities | $ 1,550 | $ 1,537
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 | 50.00% |
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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