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Post-employee benefit plans - Service Cost (Details) - CAD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Disclosure of defined benefit plans [line items]
DC pension	$ (26)	$ (26)	$ (64)	$ (62)
Less:
Capitalized benefit plans cost	16	19	33	37
Total post-employment benefit plans service cost	(59)	(63)	(128)	(137)
DB pension
Disclosure of defined benefit plans [line items]
Current service cost	(49)	(56)	(97)	(111)
OPEBs
Disclosure of defined benefit plans [line items]
Current service cost	$ 0	$ 0	$ 0	$ (1)

X

- Definition

Post-Employment Benefit Expense, Benefit Plans, Service Cost Capitalized

+ References

No definition available.

+ Details

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- Definition

Post-Employment Benefit Expense, Benefit Plans, Service Cost Capitalized [Abstract]

+ References

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- Definition

Post-Employment Benefit Expense, Benefit Plans, Service Cost, Net

+ References

No definition available.

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X

- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 19
-IssueDate 2021-01-01
-Paragraph 141
-Subparagraph a
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2021-en-r&anchor=para_141_a&doctype=Standard
-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 amount of post-employment benefit expense relating to defined contribution plans. Defined contribution plans are post-employment benefit plans under which an entity pays fixed contributions into a separate entity (a fund) and will have no legal or constructive obligation to pay further contributions if the fund does not hold sufficient assets to pay all employee benefits relating to employee service in the current and prior periods.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 19
-IssueDate 2021-01-01
-Paragraph 53
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2021-en-r&anchor=para_53&doctype=Standard
-URIDate 2021-03-24

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