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Credit Facilities, Long-Term Debt and Lease Liabilities - Principal Repayments (Details) - CAD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Disclosure of detailed information about borrowings [line items]
Borrowings	$ 3,361	$ 3,212
2021
Disclosure of detailed information about borrowings [line items]
Lease commitments for short-term leases for which recognition exemption has been used	(13)
Gross carrying amount
Disclosure of detailed information about borrowings [line items]
Borrowings	3,264
Lease liabilities	134
Gross carrying amount | 2021
Disclosure of detailed information about borrowings [line items]
Borrowings	96
Lease liabilities	(5)
Gross carrying amount | 2022
Disclosure of detailed information about borrowings [line items]
Borrowings	626
Lease liabilities	6
Gross carrying amount | 2023
Disclosure of detailed information about borrowings [line items]
Borrowings	277
Lease liabilities	5
Gross carrying amount | 2024
Disclosure of detailed information about borrowings [line items]
Borrowings	119
Lease liabilities	5
Gross carrying amount | 2025
Disclosure of detailed information about borrowings [line items]
Borrowings	136
Lease liabilities	5
Gross carrying amount | 2026
Disclosure of detailed information about borrowings [line items]
Borrowings	2,010
Lease liabilities	$ 118

X

- Definition

The amount of outstanding funds that the entity is obligated to repay.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
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-IssueDate 2019-01-01
-Paragraph 55
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- Definition

The amount of the lease commitments for short-term leases accounted for applying paragraph 6 of IFRS 16. Short-term lease is a lease that, at the commencement date, has a lease term of 12 months or less. A lease that contains a purchase option is not a short-term lease.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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-IssueDate 2019-01-01
-Paragraph 55
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- Definition

The amount of liabilities related to the entity's leases. Lease is a contract, or part of a contract, that conveys the right to use an underlying asset for a period of time in exchange for consideration.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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-IssueDate 2019-01-01
-Paragraph 47
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