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Employee Future Benefits - Schedule of Allocation of and Fair Value of Plan Assets (Details) - CAD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Defined Benefit Plan Disclosure [Line Items]
2023 Target Allocation	100.00%
Actual plan asset allocation	100.00%	100.00%
Fair value of plan assets	$ 3,743	$ 3,468
Equities
Defined Benefit Plan Disclosure [Line Items]
2023 Target Allocation	47.00%
Actual plan asset allocation	46.00%	48.00%
Fair value of plan assets	$ 1,725	$ 1,671
Fixed income
Defined Benefit Plan Disclosure [Line Items]
2023 Target Allocation	46.00%
Actual plan asset allocation	45.00%	43.00%
Fair value of plan assets	$ 1,679	$ 1,488
Real estate
Defined Benefit Plan Disclosure [Line Items]
2023 Target Allocation	6.00%
Actual plan asset allocation	8.00%	8.00%
Fair value of plan assets	$ 291	$ 282
Cash and other
Defined Benefit Plan Disclosure [Line Items]
2023 Target Allocation	1.00%
Actual plan asset allocation	1.00%	1.00%
Fair value of plan assets	$ 48	$ 27
Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	932	870
Level 1 | Equities
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	666	666
Level 1 | Fixed income
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	232	199
Level 1 | Real estate
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Level 1 | Cash and other
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	34	5
Level 2
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	2,520	2,316
Level 2 | Equities
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	1,059	1,005
Level 2 | Fixed income
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	1,447	1,289
Level 2 | Real estate
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Level 2 | Cash and other
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	14	22
Level 3
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	291	282	$ 256
Level 3 | Equities
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Level 3 | Fixed income
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Level 3 | Real estate
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	291	282
Level 3 | Cash and other
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	$ 0	$ 0

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Amount of asset segregated and restricted to provide benefit under defined benefit plan. Asset includes, but is not limited to, stock, bond, other investment, earning from investment, and contribution by employer and employee.

+ References

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Percentage of target investment allocation to total plan assets. Includes, but is not limited to, percentage on weighted-average basis if more than one plan.

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Percentage of actual investment allocation to total plan assets. Includes, but is not limited to, percentage on weighted-average basis if more than one plan.

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