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Leases - Lease Liabilities and Expense (Details) - CAD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Lease liabilities [abstract]
Lease liabilities	$ 1,690	$ 1,809
Less: current portion	189	233
Non-current lease liabilities	1,501	1,576
Expenses relating to short-term leases	409	448
Interest expense on lease liabilities	67	70
Variable lease payments not included in the measurement of lease liabilities	85	118
Total cash outflows for leases	983	1,178
Increase through capitalization of short-term leases, property, plant and equipment	$ 197	$ 305

X

- Definition

Increase Through Capitalization Of Short-Term Leases, Property, Plant And Equipment

+ References

No definition available.

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X

- Definition

The cash outflow for leases.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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-Number 16
-IssueDate 2020-01-01
-Paragraph 53
-Subparagraph g
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- Definition

The amount of current lease liabilities. [Refer: Lease liabilities]

+ References

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-Name IFRS
-Number 16
-IssueDate 2020-01-01
-Paragraph 47
-Subparagraph b
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X

- Definition

The amount of the expense relating to short-term leases accounted for applying paragraph 6 of IFRS 16. This expense need not include the expense relating to leases with a lease term of one month or less. 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

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-Name IFRS
-Number 16
-IssueDate 2020-01-01
-Paragraph 53
-Subparagraph c
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=16&code=ifrs-tx-2020-en-r&anchor=para_53_c&doctype=Standard
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- Definition

The amount of the expense relating to variable lease payments not included in the measurement of lease liabilities. Variable lease payments are the portion of payments made by a lessee to a lessor for the right to use an underlying asset during the lease term that varies because of changes in facts or circumstances occurring after the commencement date, other than the passage of time. [Refer: Lease liabilities]

+ References

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-IssueDate 2020-01-01
-Paragraph 53
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- Definition

The amount of interest expense on lease liabilities. [Refer: Lease liabilities]

+ References

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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

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- References

No definition available.

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- Definition

The amount of non-current lease liabilities. [Refer: Lease liabilities]

+ References

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