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Changes in Accounting Policies - Narrative (Details) - CAD ($) $ in Millions | Jan. 01, 2019 | Jan. 01, 2018
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IFRS 15 | Restatement Adjustment |  |
Disclosure of voluntary change in accounting policy [line items] |  |
Reduction to retained earnings |  | $ 44
Subsequent Event | Scenario, Forecast | IFRS 16 |  |
Disclosure of voluntary change in accounting policy [line items] |  |
Right-of-use assets | $ 800 |
Lease liabilities | $ 900 |

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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 -Note Effective 2019-01-01 -Name IFRS -Number 16 -IssueDate 2017-01-01 -Paragraph 53 -Subparagraph j -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=16&date=2017-03-01&anchor=para_53_j&doctype=Standard -URIDate 2017-03-09 + Details
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