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Employee Future Benefits - Summary of Pension and Retiree Welfare Plans (Detail) - CAD ($) | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017
Disclosure of net defined benefit liability (asset) [Line Items] |  |
Beginning balance | $ 0 |
Actuarial losses (gains) due to: |  |
Ending balance |  | $ 0
Pension defined benefit plans [member] |  |
Disclosure of net defined benefit liability (asset) [Line Items] |  |
Beginning balance | 378,000,000 |
Actuarial losses (gains) due to: |  |
Experience |  | 15,000,000
Demographic assumption changes | 35,000,000 |
Economic assumption changes | (250,000,000) | 214,000,000
Ending balance | 494,000,000 | 378,000,000
Return on plan assets (excluding interest income) | 315,000,000 | (312,000,000)
Pension defined benefit plans [member] | Present value of defined benefit obligation [Member] |  |
Disclosure of net defined benefit liability (asset) [Line Items] |  |
Beginning balance | 4,706,000,000 | 4,767,000,000
Current service cost | 42,000,000 | 48,000,000
Past service cost - amendments | 8,000,000 |
Past service cost - curtailments | 10,000,000 |
Interest cost | 165,000,000 | 182,000,000
Plan participants' contributions | 1,000,000 | 1,000,000
Actuarial losses (gains) due to: |  |
Experience |  | 15,000,000
Demographic assumption changes | 35,000,000 |
Economic assumption changes | (250,000,000) | 214,000,000
Benefits paid | (304,000,000) | (315,000,000)
Impact of changes in foreign exchange rates | 262,000,000 | (206,000,000)
Ending balance | 4,675,000,000 | 4,706,000,000
Pension defined benefit plans [member] | Plan assets [Member] |  |
Disclosure of net defined benefit liability (asset) [Line Items] |  |
Beginning balance | 4,328,000,000 | 4,277,000,000
Interest cost | 153,000,000 | 164,000,000
Plan participants' contributions | 1,000,000 | 1,000,000
Actuarial losses (gains) due to: |  |
Benefits paid | (304,000,000) | (315,000,000)
Impact of changes in foreign exchange rates | 254,000,000 | (191,000,000)
Ending balance | 4,190,000,000 | 4,328,000,000
Return on plan assets (excluding interest income) | (315,000,000) | 312,000,000
Employer contributions | 79,000,000 | 85,000,000
Administration costs | (6,000,000) | (5,000,000)
Retiree welfare plans [Member] |  |
Disclosure of net defined benefit liability (asset) [Line Items] |  |
Beginning balance | 78,000,000 |
Actuarial losses (gains) due to: |  |
Experience | (7,000,000) | (9,000,000)
Demographic assumption changes | (1,000,000) |
Economic assumption changes | (56,000,000) | 41,000,000
Ending balance | 30,000,000 | 78,000,000
Return on plan assets (excluding interest income) | 16,000,000 | (30,000,000)
Retiree welfare plans [Member] | Present value of defined benefit obligation [Member] |  |
Disclosure of net defined benefit liability (asset) [Line Items] |  |
Beginning balance | 665,000,000 | 682,000,000
Current service cost |  | 1,000,000
Past service cost - curtailments | 12,000,000 |
Interest cost | 24,000,000 | 26,000,000
Plan participants' contributions | 4,000,000 | 4,000,000
Actuarial losses (gains) due to: |  |
Experience | (7,000,000) | (9,000,000)
Demographic assumption changes | (1,000,000) |
Economic assumption changes | (56,000,000) | 41,000,000
Benefits paid | (45,000,000) | (45,000,000)
Impact of changes in foreign exchange rates | 44,000,000 | (35,000,000)
Ending balance | 640,000,000 | 665,000,000
Retiree welfare plans [Member] | Plan assets [Member] |  |
Disclosure of net defined benefit liability (asset) [Line Items] |  |
Beginning balance | 587,000,000 | 603,000,000
Interest cost | 21,000,000 | 23,000,000
Plan participants' contributions | 4,000,000 | 4,000,000
Actuarial losses (gains) due to: |  |
Benefits paid | (45,000,000) | (45,000,000)
Impact of changes in foreign exchange rates | 51,000,000 | (38,000,000)
Ending balance | 610,000,000 | 587,000,000
Return on plan assets (excluding interest income) | (16,000,000) | 30,000,000
Employer contributions | 10,000,000 | 12,000,000
Administration costs | $ (2,000,000) | $ (2,000,000)

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- Definition The decrease (increase) in a net defined benefit liability (asset) resulting from actuarial gains (losses) arising from changes in demographic assumptions that result in remeasurements of the net defined benefit liability (asset). Demographic assumptions deal with matters such as: (a) mortality; (b) rates of employee turnover, disability and early retirement; (c) the proportion of plan members with dependants who will be eligible for benefits; (d) the proportion of plan members who will select each form of payment option available under the plan terms; and (e) claim rates under medical plans. [Refer: Net defined benefit liability (asset)] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2018-01-01 -Paragraph 141 -Subparagraph c -Clause ii -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2018-03-01&anchor=para_141_c_ii&doctype=Standard -URIDate 2018-03-16 + Details
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- Definition The decrease (increase) in a net defined benefit liability (asset) resulting from actuarial gains (losses) arising from changes in financial assumptions that result in remeasurements of the net defined benefit liability (asset). Financial assumptions deal with items such as: (a) the discount rate; (b) benefit levels, excluding any cost of the benefits to be met by employees, and future salary; (c) in the case of medical benefits, future medical costs, including claim handling costs (ie the costs that will be incurred in processing and resolving claims, including legal and adjuster's fees); and (d) taxes payable by the plan on contributions relating to service before the reporting date or on benefits resulting from that service. [Refer: Net defined benefit liability (asset)] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2018-01-01 -Paragraph 141 -Subparagraph c -Clause iii -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2018-03-01&anchor=para_141_c_iii&doctype=Standard -URIDate 2018-03-16 + Details
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- Definition The decrease (increase) in net defined benefit liability (asset) resulting from contributions to a defined benefit plan by the employer. [Refer: Net defined benefit liability (asset); Defined benefit plans [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2018-01-01 -Paragraph 141 -Subparagraph f -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2018-03-01&anchor=para_141_f&doctype=Standard -URIDate 2018-03-16 + Details
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- Definition The decrease (increase) in the net defined benefit liability (asset) resulting from contributions to a defined benefit plan by plan participants. [Refer: Net defined benefit liability (asset); Defined benefit plans [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2018-01-01 -Paragraph 141 -Subparagraph f -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2018-03-01&anchor=para_141_f&doctype=Standard -URIDate 2018-03-16 + Details
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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 2018-01-01 -Paragraph 141 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2018-03-01&anchor=para_141_a&doctype=Standard -URIDate 2018-03-16 + Details
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- Definition The increase (decrease) in the net defined benefit liability (asset) resulting from changes in foreign exchange rates. [Refer: Net defined benefit liability (asset)] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2018-01-01 -Paragraph 141 -Subparagraph e -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2018-03-01&anchor=para_141_e&doctype=Standard -URIDate 2018-03-16 + 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 2018-01-01 -Paragraph 141 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2018-03-01&anchor=para_141_b&doctype=Standard -URIDate 2018-03-16 + Details
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- Definition The amount of deficit or surplus in a defined benefit plan, adjusted for any effect of limiting a net defined benefit asset to the asset ceiling. [Refer: Defined benefit plans [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2018-01-01 -Paragraph 140 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2018-03-01&anchor=para_140_a&doctype=Standard -URIDate 2018-03-16 + Details
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- Definition The decrease (increase) in the net defined benefit liability (asset) resulting from payments from the plan. [Refer: Net defined benefit liability (asset)] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2018-01-01 -Paragraph 141 -Subparagraph g -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2018-03-01&anchor=para_141_g&doctype=Standard -URIDate 2018-03-16 + Details
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- Definition The decrease (increase) in the net defined benefit liability (asset) resulting from the return on plan assets, excluding amounts included in interest income or expense. The return on plans assets is interest, dividends and other revenue derived from the plan assets, together with realised and unrealised gains or losses on the plan assets, less any costs of managing plan assets and less any tax payable by the plan itself, other than tax included in the actuarial assumptions used to measure the present value of the defined benefit obligation. [Refer: Plan assets [member]; Net defined benefit liability (asset); Actuarial assumptions [member]; Interest expense (income), net defined benefit liability (asset)] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2018-01-01 -Paragraph 141 -Subparagraph c -Clause i -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2018-03-01&anchor=para_141_c_i&doctype=Standard -URIDate 2018-03-16 + Details
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- Definition Past service cost curtailments, net defined benefit liability (asset). + References No definition available. + Details
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