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Pension Plans and Other Post-Retirement Benefits - Narrative (Details) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2018 CAD ($) Year | Dec. 31, 2017 CAD ($)
Disclosure of defined benefit plans [line items] |  |
Age requirement | Year | 50 |
Requisite service period | 10 years |
Equity investments | 3.00% | 3.00%
Post-employment benefit expense, defined contribution plans | $ | $ 120 | $ 109
Fixed income investments | Level 1 |  |
Disclosure of defined benefit plans [line items] |  |
Equity investments | 2.00% | 2.00%

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- Definition Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table. + References No definition available. + Details
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- Definition The amount of post-employment benefit expense relating to defined contribution plans. Defined contribution plans are post-employment benefit plans under which an entity pays fixed contributions into a separate entity (a fund) and will have no legal or constructive obligation to pay further contributions if the fund does not hold sufficient assets to pay all employee benefits relating to employee service in the current and prior periods. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2017-01-01 -Paragraph 53 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2017-03-01&anchor=para_53&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition Defined Benefit Plan, Requisite Service Period + References No definition available. + Details
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- Definition Equity Instruments, Amount Contributed To Fair Value Of Plan Assets, Allocation Percentage + References No definition available. + Details
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