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Adoption of New IFRS Pronouncements - Reconciliation of Lease Liabilities (Details) - CAD ($) $ in Millions | Dec. 31, 2019 | Jan. 01, 2019 | Dec. 31, 2018
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Adoption Of New IFRS Pronouncements [Line Items] |  |  |
Future aggregate minimum lease payments under operating leases |  | $ 439 |
Recognition exemptions and other |  | (2) |
Undiscounted minimum lease payments: | $ 1,140 | 437 |
Effect of discounting at the incremental borrowing rate |  | (95) |
Total lease liabilities as at January 1, 2019 | $ 672 | 680 | $ 338
Finance Lease Liabilities |  | 338 | $ 338
IFRS 16 |  |  |
Adoption Of New IFRS Pronouncements [Line Items] |  |  |
Total lease liabilities as at January 1, 2019 |  | $ 342 |

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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 -Name IFRS -Number 16 -IssueDate 2019-01-01 -Paragraph 55 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=16&code=ifrs-tx-2019-en-r&anchor=para_55&doctype=Standard -URIDate 2019-03-27 + 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 [Line Items] for Adoption Of New IFRS Pronouncements [Table] + References No definition available. + Details
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- Definition Finance Lease Liabilities + References No definition available. + Details
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- Definition Lessee Operating Lease Liability Undiscounted Excess Amount + References No definition available. + Details
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- Definition Minimum Lease Payments Payable Under Noncancellable Operating Lease + References No definition available. + Details
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- Definition Undiscounted Operating Lease Payments To Be Paid + References No definition available. + Details
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- Details
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