Leases - Right-of-Use Assets (Details) - CAD ($) $ in Millions	12 Months Ended
Dec. 31, 2022	Dec. 31, 2021
Leases [Abstract]
Opening net book value	$ 704	$ 730
Additions	202	141
Depreciation	(142)	(163)
Changes in foreign exchange rates and other	39	(4)
Transfers to assets held for sale	(219)	0
Closing net book value	$ 584	$ 704

The amount of additions to right-of-use assets. [Refer: Right-of-use assets]

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 16
-IssueDate 2022-03-24
-Paragraph 53
-Subparagraph h
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-URIDate 2022-03-24

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Balance Type:	debit
Period Type:	duration

- Definition

The amount of depreciation of right-of-use assets. [Refer: Depreciation and amortisation expense; Right-of-use assets]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 16
-IssueDate 2022-03-24
-Paragraph 53
-Subparagraph a
-URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=16&code=ifrs-tx-2022-en-r&anchor=para_53_a&doctype=Standard
-URIDate 2022-03-24

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- Definition

The amount of assets that represent a lessee's right to use an underlying asset for the lease term. Underlying asset is an asset that is the subject of a lease, for which the right to use that asset has been provided by a lessor to a lessee.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 16
-IssueDate 2022-03-24
-Paragraph 53
-Subparagraph j
-URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=16&code=ifrs-tx-2022-en-r&anchor=para_53_j&doctype=Standard
-URIDate 2022-03-24

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- Definition

Changes In Foreign Exchange Rates And Other

+ References

No definition available.

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- Definition

Leases [Abstract]

+ References

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- Definition

Right of Use Assets, Increase (Decrease) Through Transfer to Assets Held For Sale

+ References

No definition available.

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