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Leases - Impacts to the Consolidated Financial Statements on Transition (Details) - CAD ($) | Dec. 31, 2019 | Jan. 01, 2019 | Dec. 31, 2018
--- | --- | --- | ---
Disclosure of leases [Abstract] |  |  |
Right-of-use assets | $ 1,789,000,000 | $ 1,539,000,000 |
Lease liabilities | $ 1,809,000,000 | $ 1,539,000,000 | $ 0
Weighted average lessee's incremental borrowing rate applied to lease liabilities recognised at date of initial application of IFRS 16 |  | 4.00% |
Leases previously reported as commitments at December 31, 2018 |  |  | $ 1,430,000,000
Impact of discounting |  | $ (317,000,000) |
Leases previously reported as commitments, discounted at January 1, 2019 |  | 1,113,000,000 |
Lease extension options and renewals reasonably certain to be exercised |  | 243,000,000 |
Arrangements determined to be leases under IFRS 16 |  | 83,000,000 |
Leases entered into on behalf of a joint operation |  | $ 100,000,000 |

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- Definition Commitments Determined To Be Leases Under IFRS Sixteen + References No definition available. + Details
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- Definition Disclosure of leases [Abstract] + References No definition available. + Details
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- Definition Lease Liabilities, Joint Operations + References No definition available. + Details
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- Definition Lease Liability Extension Options And Renewals Reasonably Certain To Be Exercised + References No definition available. + Details
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- Definition Minimum Lease Payments Impact Of Discounting + References No definition available. + Details
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- Definition Minimum Lease Payments Of Arrangements That Exclude Payments For Non-Lease Elements + References No definition available. + Details
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- Definition Minimum Lease Payments Payable Under Non-Cancellable Lease + References No definition available. + Details
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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 -Name IFRS -Number 16 -IssueDate 2019-01-01 -Paragraph 47 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=16&code=ifrs-tx-2019-en-r&anchor=para_47_b&doctype=Standard -URIDate 2019-03-27 + Details
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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 2019-01-01 -Paragraph 53 -Subparagraph j -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=16&code=ifrs-tx-2019-en-r&anchor=para_53_j&doctype=Standard -URIDate 2019-03-27 + Details
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- Definition The weighted average lessee's incremental borrowing rate applied to lease liabilities recognised in the statement of financial position at the date of initial application of IFRS 16. The incremental borrowing rate is the rate of interest that a lessee would have to pay to borrow over a similar term, and with a similar security, the funds necessary to obtain an asset of a similar value to the right-of-use asset in a similar economic environment. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 16 -IssueDate 2019-01-01 -Paragraph C12 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=16&code=ifrs-tx-2019-en-r&anchor=para_C12_a&doctype=Appendix&subtype=C -URIDate 2019-03-27 + Details
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