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Employee Future Benefits - Schedule of Allocation of and Fair Value of Plan Assets (Details) - CAD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Defined Benefit Plan Disclosure [Line Items]
2024 Target Allocation	100.00%
Actual plan asset allocation	100.00%	100.00%
Fair value of plan assets	$ 4,119	$ 3,743
Equities
Defined Benefit Plan Disclosure [Line Items]
2024 Target Allocation	46.00%
Actual plan asset allocation	47.00%	46.00%
Fair value of plan assets	$ 1,941	$ 1,725
Fixed income
Defined Benefit Plan Disclosure [Line Items]
2024 Target Allocation	46.00%
Actual plan asset allocation	45.00%	45.00%
Fair value of plan assets	$ 1,829	$ 1,679
Real estate
Defined Benefit Plan Disclosure [Line Items]
2024 Target Allocation	7.00%
Actual plan asset allocation	7.00%	8.00%
Fair value of plan assets	$ 300	$ 291
Cash and other
Defined Benefit Plan Disclosure [Line Items]
2024 Target Allocation	1.00%
Actual plan asset allocation	1.00%	1.00%
Fair value of plan assets	$ 49	$ 48
Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	1,064	932
Level 1 | Equities
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	773	666
Level 1 | Fixed income
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	268	232
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	23	34
Level 2
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	2,755	2,520
Level 2 | Equities
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	1,168	1,059
Level 2 | Fixed income
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	1,561	1,447
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	26	14
Level 3
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	300	291	$ 282
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	300	291
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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-Topic 715
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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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-Topic 715
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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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