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Employee Future Benefits - Summary of Major Categories of Plan Assets and Actual Per Cent Allocation to Each Category (Detail) - CAD ($) $ in Millions | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Pension defined benefit plans [member] |  |
Disclosure of fair value of plan assets [Line Items] |  |
Total | $ 3,722.0 | $ 4,510.0
Retiree welfare plans [Member] |  |
Disclosure of fair value of plan assets [Line Items] |  |
Total | 523.0 | 587.0
U.S. plans [Member] |  |
Disclosure of fair value of plan assets [Line Items] |  |
Equity securities | 1.2 | 1.2
U.S. plans [Member] | Pension defined benefit plans [member] | Fair value measurements [member] |  |
Disclosure of fair value of plan assets [Line Items] |  |
Total | $ 2,581.0 | $ 3,028.0
Percentage of fair value measurements | 100.00% | 100.00%
U.S. plans [Member] | Pension defined benefit plans [member] | Fair value measurements [member] | Debt securities [Member] |  |
Disclosure of fair value of plan assets [Line Items] |  |
Debt securities | $ 1,509.0 | $ 1,863.0
Percentage of fair value measurements | 58.00% | 61.00%
U.S. plans [Member] | Pension defined benefit plans [member] | Fair value measurements [member] | Cash and cash equivalents [Member] |  |
Disclosure of fair value of plan assets [Line Items] |  |
Cash and cash equivalents | $ 35.0 | $ 90.0
Percentage of fair value measurements | 1.00% | 3.00%
U.S. plans [Member] | Pension defined benefit plans [member] | Fair value measurements [member] | Equity securities [Member] |  |
Disclosure of fair value of plan assets [Line Items] |  |
Equity securities | $ 377.0 | $ 600.0
Percentage of fair value measurements | 15.00% | 20.00%
U.S. plans [Member] | Pension defined benefit plans [member] | Fair value measurements [member] | Other investments [member] |  |
Disclosure of fair value of plan assets [Line Items] |  |
Other investments | $ 660.0 | $ 475.0
Percentage of fair value measurements | 26.00% | 16.00%
U.S. plans [Member] | Retiree welfare plans [Member] | Fair value measurements [member] |  |
Disclosure of fair value of plan assets [Line Items] |  |
Total | $ 523.0 | $ 587.0
Percentage of fair value measurements | 100.00% | 100.00%
U.S. plans [Member] | Retiree welfare plans [Member] | Fair value measurements [member] | Debt securities [Member] |  |
Disclosure of fair value of plan assets [Line Items] |  |
Debt securities | $ 445.0 | $ 501.0
Percentage of fair value measurements | 85.00% | 85.00%
U.S. plans [Member] | Retiree welfare plans [Member] | Fair value measurements [member] | Cash and cash equivalents [Member] |  |
Disclosure of fair value of plan assets [Line Items] |  |
Cash and cash equivalents | $ 22.0 | $ 21.0
Percentage of fair value measurements | 4.00% | 4.00%
U.S. plans [Member] | Retiree welfare plans [Member] | Fair value measurements [member] | Equity securities [Member] |  |
Disclosure of fair value of plan assets [Line Items] |  |
Equity securities | $ 41.0 | $ 57.0
Percentage of fair value measurements | 8.00% | 10.00%
U.S. plans [Member] | Retiree welfare plans [Member] | Fair value measurements [member] | Other investments [member] |  |
Disclosure of fair value of plan assets [Line Items] |  |
Other investments | $ 15.0 | $ 8.0
Percentage of fair value measurements | 3.00% | 1.00%
Canadian plans [Member] |  |
Disclosure of fair value of plan assets [Line Items] |  |
Equity securities |  |
Canadian plans [Member] | Pension defined benefit plans [member] | Fair value measurements [member] |  |
Disclosure of fair value of plan assets [Line Items] |  |
Total | $ 1,141.0 | $ 1,482.0
Percentage of fair value measurements | 100.00% | 100.00%
Canadian plans [Member] | Pension defined benefit plans [member] | Fair value measurements [member] | Debt securities [Member] |  |
Disclosure of fair value of plan assets [Line Items] |  |
Debt securities | $ 898.0 | $ 1,144.0
Percentage of fair value measurements | 79.00% | 77.00%
Canadian plans [Member] | Pension defined benefit plans [member] | Fair value measurements [member] | Cash and cash equivalents [Member] |  |
Disclosure of fair value of plan assets [Line Items] |  |
Cash and cash equivalents | $ 9.0 | $ 14.0
Percentage of fair value measurements | 1.00% | 1.00%
Canadian plans [Member] | Pension defined benefit plans [member] | Fair value measurements [member] | Equity securities [Member] |  |
Disclosure of fair value of plan assets [Line Items] |  |
Equity securities | $ 233.0 | $ 322.0
Percentage of fair value measurements | 20.00% | 22.00%
Canadian plans [Member] | Pension defined benefit plans [member] | Fair value measurements [member] | Other investments [member] |  |
Disclosure of fair value of plan assets [Line Items] |  |
Other investments | $ 1.0 | $ 2.0
Percentage of fair value measurements | 0.00% | 0.00%

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