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Post-employment benefit plans - Funded Status of Post-Employment Benefit Plans Cost (Details) - Plan asset (deficit) - CAD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Disclosure of defined benefit plans [line items]
Present value of post-employment benefit obligations	$ (26,001)	$ (28,749)
Fair value of plan assets	28,391	28,129
Plan surplus (deficit)	2,390	(620)
FUNDED
Disclosure of defined benefit plans [line items]
Present value of post-employment benefit obligations	(23,872)	(26,421)
Fair value of plan assets	27,979	27,727
Plan surplus (deficit)	4,107	1,306
PARTIALLY FUNDED
Disclosure of defined benefit plans [line items]
Present value of post-employment benefit obligations	(1,840)	(2,011)
Fair value of plan assets	412	402
Plan surplus (deficit)	(1,428)	(1,609)
UNFUNDED
Disclosure of defined benefit plans [line items]
Present value of post-employment benefit obligations	(289)	(317)
Fair value of plan assets	0	0
Plan surplus (deficit)	$ (289)	$ (317)

X

- Definition

The present value, without deducting any plan assets, of expected future payments required to settle the obligation resulting from employee service in the current and prior periods. [Refer: Plan assets, at fair value]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 19
-IssueDate 2021-01-01
-Paragraph 57
-Subparagraph a
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-URIDate 2021-03-24

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- Definition

Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with members defined in one or many axes of the table.

+ References

No definition available.

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- Definition

The fair value of defined benefit plan assets. Plan assets comprise assets held by a long-term employee benefit fund and qualifying insurance policies. [Refer: At fair value [member]]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 19
-IssueDate 2021-01-01
-Paragraph 57
-Subparagraph a
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2021-en-r&anchor=para_57_a&doctype=Standard
-URIDate 2021-03-24

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- Definition

The fair value of any plan assets, less the present value of the defined benefit obligation. [Refer: Plan assets [member]]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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-Number 19
-IssueDate 2021-01-01
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-URIDate 2021-03-24

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