v3.24.2.u1

employee future benefits - Defined benefit pension plans - summary (Details) - CAD ($) $ in Millions	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023	Dec. 31, 2023
Other comprehensive income
Discount rate used to determine defined benefit obligations	4.97%		4.97%		4.65%
Total	$ (22)	$ (5)	$ (69)	$ 1
Effect of asset ceiling limit
Other comprehensive income
Changes in the effect of limiting net defined benefit plan assets to the asset ceiling			1,188		$ 914
Pension plans | Pension plan | Present value of the defined benefit obligations
Employee benefits expense
Benefits earned for current service	(20)	(20)	(40)	(38)
Benefits earned for past service	(1)		(1)
Total	(21)	(20)	(41)	(38)
Financing costs
Notional income on plan assets and interest on defined benefit obligations accrued	(96)	(100)	(193)	(200)
Total	(96)	(100)	(193)	(200)
Other comprehensive income
Changes in plan financial assumptions	92	(9)	327	(200)
Total	92	(9)	327	(200)
AMOUNTS INCLUDED IN OPERATING ACTIVITIES CASH FLOWS
BENEFITS PAID BY PLANS			234	234
PLAN ACCOUNT BALANCES
Change in period			327	(204)
Balance at beginning of period			(8,489)	(8,075)	(8,075)
Balance at end of period	(8,162)	(8,279)	(8,162)	(8,279)	(8,489)
Pension plans | Pension plan | Present value of the defined benefit obligations | Pension plans that have plan assets in excess of defined benefit obligations accrued
PLAN ACCOUNT BALANCES
Balance at end of period	(7,740)	(7,042)	(7,740)	(7,042)
Pension plans | Pension plan | Present value of the defined benefit obligations | Pension plans that have defined benefit obligations accrued in excess of plan assets
PLAN ACCOUNT BALANCES
Balance at end of period	(422)	(1,237)	(422)	(1,237)
Pension plans | Pension plan | Present value of the defined benefit obligations | Pension plans that have defined benefit obligations accrued in excess of plan assets - Funded
PLAN ACCOUNT BALANCES
Balance at end of period	(210)	(1,029)	(210)	(1,029)
Pension plans | Pension plan | Present value of the defined benefit obligations | Pension plans that have defined benefit obligations accrued in excess of plan assets - Unfunded
PLAN ACCOUNT BALANCES
Balance at end of period	(212)	(208)	(212)	(208)
Pension plans | Pension plan | Plan assets
Employee benefits expense
Employees' contributions	5	5	9	9
Administrative fees	(1)	(1)	(2)	(2)
Total	4	4	7	7
Financing costs
Notional income on plan assets and interest on defined benefit obligations accrued	105	109	210	219
Interest effect on asset ceiling limit	(11)	(11)	(21)	(23)
Total	94	98	189	196
Other comprehensive income
Plan assets - Difference between actual results and estimated plan assumptions	(3)	8	(5)	234
Changes in the effect of limiting net defined benefit plan assets to the asset ceiling	(67)	6	(253)	(35)
Total	(70)	14	(258)	199
AMOUNTS INCLUDED IN OPERATING ACTIVITIES CASH FLOWS
Employer contributions			14	16
BENEFITS PAID BY PLANS			(234)	(234)
PLAN ACCOUNT BALANCES
Change in period			(282)	184
Balance at beginning of period			8,352	7,990	7,990
Balance at end of period	8,070	8,174	8,070	8,174	8,352
Pension plans | Pension plan | Plan assets | Pension plans that have plan assets in excess of defined benefit obligations accrued
PLAN ACCOUNT BALANCES
Balance at end of period	8,061	7,349	8,061	7,349
Pension plans | Pension plan | Plan assets | Pension plans that have defined benefit obligations accrued in excess of plan assets
PLAN ACCOUNT BALANCES
Balance at end of period	9	825	9	825
Pension plans | Pension plan | Plan assets | Pension plans that have defined benefit obligations accrued in excess of plan assets - Funded
PLAN ACCOUNT BALANCES
Balance at end of period	9	825	9	825
Pension plans | Pension plan | Net
Employee benefits expense
Total	(17)	(16)	(34)	(31)
Financing costs
Total	(2)	(2)	(4)	(4)
DEFINED BENEFIT (COST) INCLUDED IN NET INCOME	(19)	(18)	(38)	(35)
Other comprehensive income
Total	22	5	69	(1)
DEFINED BENEFIT (COST) INCLUDED IN COMPREHENSIVE INCOME	3	(13)	31	(36)
AMOUNTS INCLUDED IN OPERATING ACTIVITIES CASH FLOWS
Employer contributions			14	16
PLAN ACCOUNT BALANCES
Change in period			45	(20)
Balance at beginning of period			(137)	(85)	(85)
Balance at end of period	(92)	(105)	(92)	(105)	$ (137)
Pension plans | Pension plan | Net | Pension plans that have plan assets in excess of defined benefit obligations accrued
PLAN ACCOUNT BALANCES
Balance at end of period	321	307	321	307
Pension plans | Pension plan | Net | Pension plans that have defined benefit obligations accrued in excess of plan assets
PLAN ACCOUNT BALANCES
Balance at end of period	(413)	(412)	(413)	(412)
Pension plans | Pension plan | Net | Pension plans that have defined benefit obligations accrued in excess of plan assets - Funded
PLAN ACCOUNT BALANCES
Balance at end of period	(201)	(204)	(201)	(204)
Pension plans | Pension plan | Net | Pension plans that have defined benefit obligations accrued in excess of plan assets - Unfunded
PLAN ACCOUNT BALANCES
Balance at end of period	$ (212)	$ (208)	$ (212)	$ (208)

X

- Definition

The discount rate used as the significant actuarial assumption to determine the present value of a defined benefit obligation. [Refer: Defined benefit obligation, at present value; Actuarial assumptions [member]]

+ References

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The decrease (increase) in a net defined benefit liability (asset) resulting from actuarial gains (losses) arising from changes in financial assumptions that result in remeasurements of the net defined benefit liability (asset). Financial assumptions deal with items such as: (a) the discount rate; (b) benefit levels, excluding any cost of the benefits to be met by employees, and future salary; (c) in the case of medical benefits, future medical costs, including claim handling costs (ie the costs that will be incurred in processing and resolving claims, including legal and adjuster's fees); and (d) taxes payable by the plan on contributions relating to service before the reporting date or on benefits resulting from that service. [Refer: Net defined benefit liability (asset)]

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The decrease (increase) in net defined benefit liability (asset) resulting from contributions to a defined benefit plan by the employer. [Refer: Net defined benefit liability (asset); Defined benefit plans [member]]

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The decrease (increase) in the net defined benefit liability (asset) resulting from contributions to a defined benefit plan by plan participants. [Refer: Net defined benefit liability (asset); Defined benefit plans [member]]

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The increase (decrease) in the net defined benefit liability (asset) resulting from employee service in the current period. [Refer: Net defined benefit liability (asset)]

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The increase (decrease) in the net defined benefit liability (asset). [Refer: Net defined benefit liability (asset)]

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The increase (decrease) in the net defined benefit liability (asset) resulting from the passage of time. [Refer: Interest expense; Net defined benefit liability (asset)]

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The amount of deficit or surplus in a defined benefit plan, adjusted for any effect of limiting a net defined benefit asset to the asset ceiling. [Refer: Defined benefit plans [member]]

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The amount of other comprehensive income, before tax, related to gains (losses) on remeasurements of defined benefit plans, which comprise actuarial gains and losses; the return on plan assets, excluding amounts included in net interest on the net defined benefit liability (asset); and any change in the effect of the asset ceiling, excluding amounts included in net interest on the net defined benefit liability (asset). [Refer: Other comprehensive income; Defined benefit plans [member]; Plan assets [member]; Net defined benefit liability (asset)] [Contrast: Decrease (increase) in net defined benefit liability (asset) resulting from gain (loss) on remeasurement in other comprehensive income]

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The increase (decrease) in the net defined benefit liability (asset) resulting from past service cost. Past service cost is the change in the present value of the defined benefit obligation for employee service in prior periods, resulting from a plan amendment (the introduction or withdrawal of, or changes to, a defined benefit plan) or a curtailment (a significant reduction by the entity in the number of employees covered by a plan). [Refer: Net defined benefit liability (asset); Defined benefit plans [member]]

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The decrease (increase) in the net defined benefit liability (asset) resulting from payments from the plan. [Refer: Net defined benefit liability (asset)]

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The decrease (increase) in the net defined benefit liability (asset) resulting from the return on plan assets, excluding amounts included in interest income or expense. The return on plan assets is interest, dividends and other revenue derived from the plan assets, together with realised and unrealised gains or losses on the plan assets, less any costs of managing plan assets and less any tax payable by the plan itself, other than tax included in the actuarial assumptions used to measure the present value of the defined benefit obligation. [Refer: Plan assets [member]; Net defined benefit liability (asset); Actuarial assumptions [member]; Increase (decrease) in net defined benefit liability (asset) resulting from interest expense (income)]

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The effect on the net defined benefit liability (asset) of expenses related to defined benefit plans that the entity classifies as being administrative.

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The amount of defined benefit (cost) included in net income.

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The amount of interest effect on defined benefit plans asset ceiling limit recognized in financing costs.

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The total amount of post-employment benefit costs relating to defined benefit plan, including amounts charged to financing costs and to other comprehensive income.

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