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Pension Plans and Other Post-Retirement Benefits - Schedule of Net Benefit Expense (Details) - CAD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017
Disclosure of defined benefit plans [line items] |  |
Current service cost | $ 59 | $ 50
Net interest expense (income) | 22 | 22
Settlement losses (gains)(1) | 0 | (6)
Plan amendments | (1) | (2)
Other long-term employee benefit losses (gains) | (3) | 4
Net benefit expense | 78 | 68
Pension |  |
Disclosure of defined benefit plans [line items] |  |
Current service cost | 54 | 47
Net interest expense (income) | 13 | 12
Settlement losses (gains)(1) | 0 | (6)
Plan amendments | (1) | (2)
Other long-term employee benefit losses (gains) | 0 | 0
Net benefit expense | 67 | 51
Other post-retirement |  |
Disclosure of defined benefit plans [line items] |  |
Current service cost | 5 | 3
Net interest expense (income) | 9 | 10
Settlement losses (gains)(1) | 0 | 0
Plan amendments | 0 | 0
Other long-term employee benefit losses (gains) | (3) | 4
Net benefit expense | $ 11 | $ 17

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- Definition The increase (decrease) in the net defined benefit liability (asset) resulting from employee service in the current period. [Refer: Net defined benefit liability (asset)] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2017-01-01 -Paragraph 141 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2017-03-01&anchor=para_141_a&doctype=Standard -URIDate 2017-03-09 + Details
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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 decrease (increase) in the net defined benefit liability (asset) resulting from settlements. Settlements are transactions that eliminate all further legal or constructive obligations for part or all of the benefits provided under a defined benefit plan, other than a payment of benefits to, or on behalf of, employees that is set out in the terms of the plan and included in the actuarial assumptions. [Refer: Net defined benefit liability (asset); Defined benefit plans [member]; Actuarial assumptions [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2017-01-01 -Paragraph 141 -Subparagraph d -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2017-03-01&anchor=para_141_d&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The increase (decrease) in the net defined benefit liability (asset) resulting from the passage of time. [Refer: Interest expense; Net defined benefit liability (asset)] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2017-01-01 -Paragraph 141 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2017-03-01&anchor=para_141_b&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The amount of post-employment benefit expense relating to defined benefit plans. [Refer: Defined benefit plans [member]] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 19 -IssueDate 2017-01-01 -Paragraph 5 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2017-03-01&anchor=para_5&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition Other Long-Term Employee Benefit Gains (Losses), Net Defined Benefit Liability (Asset) + References No definition available. + Details
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- Definition Plan Amendment, Net Defined Benefit Liability (Asset) + References No definition available. + Details
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- Details
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- Details
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