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Post-employee benefit plans - Narrative (Details) - CAD ($) $ in Millions	3 Months Ended	6 Months Ended
	Jun. 30, 2022	Jun. 30, 2022	Mar. 31, 2022	Dec. 31, 2021	Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2020
Employee Benefits [Abstract]
Other comprehensive income, before tax, gains (losses)	$ 354	$ 1,233
Post-employment benefit obligations	$ 2,672	$ 6,112
Discount rates	5.30%	5.30%	4.30%	3.20%	3.30%	3.40%	2.60%
Increase (decrease) in return on plan assets	$ 2,092	$ 4,314
Gain (loss) on plan assets, percent	720.00%	13.80%
Change in effect of asset limit	22600000000.00%	56500000000.00%

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Employee Benefits [Abstract]

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Return On Plan Assets, Including Amounts Included In Net Interest On The Net Defined Benefit Liability (Asset)

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Return On Plan Assets, Including Amounts Included In Net Interest On The Net Defined Benefit Liability (Asset), Percent

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- 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

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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- Definition

The decrease (increase) in a net defined benefit liability (asset) resulting from the remeasurement of that net defined benefit liability (asset). [Refer: Net defined benefit liability (asset)]

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The amount of other comprehensive income, before tax, related to gains (losses) in relation to changes in the revaluation surplus of property, plant and equipment, right-of-use assets and intangible assets. [Refer: Other comprehensive income, before tax; Revaluation surplus]

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