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Post-employment benefit plans - Post-Employment Benefit Plan Assets (Details) - CAD ($) $ in Millions | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2022 | Mar. 01, 2023 | Jan. 01, 2023 | Dec. 31, 2021
Disclosure of fair value of plan assets [line items] |  |  |  |
Equity securities, total plan assets fair value percent | 15.00% |  |  | 16.00%
Debt securities, total plan assets fair value percent | 52.00% |  |  | 61.00%
Alternative investments, total plan asset fair value percent | 33.00% |  |  | 23.00%
Total plan assets fair value percent | 100.00% |  |  | 100.00%
Liabilities | $ 46,814 |  |  | $ 43,823
Defined benefit obligation hedged | 4,000 |  |  |
MLSE financial liability |  |  |  |
Disclosure of fair value of plan assets [line items] |  |  |  |
Liabilities | 149 |  |  | 149
Repurchased obligation | 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 | 23,355 |  |  | 28,040
Equity securities included in total plan assets | $ 11 |  |  | $ 3
Equity securities percent included in total plan assets | 0.05% |  |  | 0.01%
Debt securities included in total plan assets | $ 85 |  |  | $ 85
Debt securities percent included in total plan assets | 0.40% |  |  | 0.30%
Alternative investments included in total plan assets | $ 149 |  |  | $ 149
Alternative investments percent included in total plan assets | 0.64% |  |  | 0.53%
DB pension | Money market |  |  |  |
Disclosure of fair value of plan assets [line items] |  |  |  |
Debt securities | $ 739 |  |  | $ 1,466
DB pension | Private equities |  |  |  |
Disclosure of fair value of plan assets [line items] |  |  |  |
Alternative investments | 1,017 |  |  | 976
DB pension | Hedge funds |  |  |  |
Disclosure of fair value of plan assets [line items] |  |  |  |
Alternative investments | 1,374 |  |  | 1,208
DB pension | Real estate and infrastructure |  |  |  |
Disclosure of fair value of plan assets [line items] |  |  |  |
Alternative investments | 4,297 |  |  | 3,576
DB pension | Private Debt |  |  |  |
Disclosure of fair value of plan assets [line items] |  |  |  |
Alternative investments | 1,048 |  |  | 695
DB pension | Other |  |  |  |
Disclosure of fair value of plan assets [line items] |  |  |  |
Alternative investments | 60 |  |  | 55
DB pension | Canadian |  |  |  |
Disclosure of fair value of plan assets [line items] |  |  |  |
Equity securities | 824 |  |  | 952
DB pension | Canadian | Debt securities, excluding money market |  |  |  |
Disclosure of fair value of plan assets [line items] |  |  |  |
Debt securities | 9,904 |  |  | 13,643
DB pension | Foreign |  |  |  |
Disclosure of fair value of plan assets [line items] |  |  |  |
Equity securities | 2,555 |  |  | 3,436
DB pension | Foreign | Debt securities, excluding money market |  |  |  |
Disclosure of fair value of plan assets [line items] |  |  |  |
Debt securities | $ 1,537 |  |  | $ 2,033
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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