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Pension Plans and Other Post-Retirement Benefits - Schedule of Benefit Obligations in Excess of Fair Value of Plan Assets (Details) - CAD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017
Disclosure of defined benefit plans [line items] |  |
Net defined benefit liability (asset) - beginning balance | $ 628 |
Change in defined benefit obligations: |  |
Current service cost | 59 | $ 50
Interest income (cost) | (22) | (22)
Settlement losses (gains) | 0 | (6)
Plan amendments | (1) | (2)
Foreign exchange rate movement | (4) | 7
Change in plan assets: |  |
Administrative expense | (1) | 0
Return on plan assets (excluding amounts included in net interest expense) | (156) | 116
Fair value of plan assets | 3,253 | 3,301
Defined benefit (obligation) | (3,720) | (3,929)
Net defined benefit liability (asset) - ending balance | 467 | 628
Pension |  |
Disclosure of defined benefit plans [line items] |  |
Net defined benefit liability (asset) - beginning balance | 360 |
Change in defined benefit obligations: |  |
Current service cost | 54 | 47
Interest income (cost) | (13) | (12)
Settlement losses (gains) | 0 | (6)
Plan amendments | (1) | (2)
Foreign exchange rate movement | (2) | 6
Change in plan assets: |  |
Administrative expense | (1) | 0
Return on plan assets (excluding amounts included in net interest expense) | (156) | 116
Fair value of plan assets | 3,253 | 3,301
Defined benefit (obligation) | (3,458) | (3,661)
Net defined benefit liability (asset) - ending balance | 205 | 360
Other post-retirement |  |
Disclosure of defined benefit plans [line items] |  |
Net defined benefit liability (asset) - beginning balance | 268 |
Change in defined benefit obligations: |  |
Current service cost | 5 | 3
Interest income (cost) | (9) | (10)
Settlement losses (gains) | 0 | 0
Plan amendments | 0 | 0
Foreign exchange rate movement | (2) | 1
Change in plan assets: |  |
Administrative expense | 0 | 0
Return on plan assets (excluding amounts included in net interest expense) | 0 | 0
Fair value of plan assets | 0 | 0
Defined benefit (obligation) | (262) | (268)
Net defined benefit liability (asset) - ending balance | 262 | 268
Present value of defined benefit obligation |  |
Disclosure of defined benefit plans [line items] |  |
Net defined benefit liability (asset) - beginning balance | 3,929 | 3,807
Change in defined benefit obligations: |  |
Current service cost | 59 | 50
Interest income (cost) | (127) | (132)
Actuarial losses (gains) | (264) | 218
Benefits paid | (195) | (170)
Settlement losses (gains) | 0 | (86)
Plan amendments | (1) | (2)
Foreign exchange rate movement | 65 | (20)
Change in plan assets: |  |
Net defined benefit liability (asset) - ending balance | 3,720 | 3,929
Present value of defined benefit obligation | Pension |  |
Disclosure of defined benefit plans [line items] |  |
Net defined benefit liability (asset) - beginning balance | 3,661 | 3,545
Change in defined benefit obligations: |  |
Current service cost | 54 | 47
Interest income (cost) | (118) | (122)
Actuarial losses (gains) | (253) | 209
Benefits paid | (180) | (159)
Settlement losses (gains) | 0 | (86)
Plan amendments | (1) | (2)
Foreign exchange rate movement | 59 | (15)
Change in plan assets: |  |
Net defined benefit liability (asset) - ending balance | 3,458 | 3,661
Present value of defined benefit obligation | Other post-retirement |  |
Disclosure of defined benefit plans [line items] |  |
Net defined benefit liability (asset) - beginning balance | 268 | 262
Change in defined benefit obligations: |  |
Current service cost | 5 | 3
Interest income (cost) | (9) | (10)
Actuarial losses (gains) | (11) | 9
Benefits paid | (15) | (11)
Settlement losses (gains) | 0 | 0
Plan amendments | 0 | 0
Foreign exchange rate movement | 6 | (5)
Change in plan assets: |  |
Net defined benefit liability (asset) - ending balance | 262 | 268
Plan assets |  |
Disclosure of defined benefit plans [line items] |  |
Net defined benefit liability (asset) - beginning balance | (3,301) | (3,243)
Change in defined benefit obligations: |  |
Interest income (cost) | 105 | 110
Benefits paid | (195) | (170)
Settlement losses (gains) | 0 | (80)
Foreign exchange rate movement | 57 | (9)
Change in plan assets: |  |
Administrative expense | (1) | 0
Return on plan assets (excluding amounts included in net interest expense) | (156) | 116
Employer contributions | 142 | 91
Net defined benefit liability (asset) - ending balance | (3,253) | (3,301)
Plan assets | Pension |  |
Disclosure of defined benefit plans [line items] |  |
Net defined benefit liability (asset) - beginning balance | (3,301) | (3,243)
Change in defined benefit obligations: |  |
Interest income (cost) | 105 | 110
Benefits paid | (180) | (159)
Settlement losses (gains) | 0 | (80)
Foreign exchange rate movement | 57 | (9)
Change in plan assets: |  |
Administrative expense | (1) | 0
Return on plan assets (excluding amounts included in net interest expense) | (156) | 116
Employer contributions | 127 | 80
Net defined benefit liability (asset) - ending balance | (3,253) | (3,301)
Plan assets | Other post-retirement |  |
Disclosure of defined benefit plans [line items] |  |
Net defined benefit liability (asset) - beginning balance | 0 | 0
Change in defined benefit obligations: |  |
Interest income (cost) | 0 | 0
Benefits paid | (15) | (11)
Settlement losses (gains) | 0 | 0
Foreign exchange rate movement | 0 | 0
Change in plan assets: |  |
Administrative expense | 0 | 0
Return on plan assets (excluding amounts included in net interest expense) | 0 | 0
Employer contributions | 15 | 11
Net defined benefit liability (asset) - ending balance | $ 0 | $ 0

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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 2017-01-01 -Paragraph 141 -Subparagraph f -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2017-03-01&anchor=para_141_f&doctype=Standard -URIDate 2017-03-09 + 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 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 The present value, without deducting any plan assets, of expected future payments required to settle the obligation resulting from employee service in the current and prior periods. [Refer: Plan assets, at fair value] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 19 -IssueDate 2017-01-01 -Paragraph 57 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2017-03-01&anchor=para_57_a&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The decrease (increase) in a net defined benefit liability (asset) resulting from the remeasurement of that net defined benefit liability (asset). [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 c -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2017-03-01&anchor=para_141_c&doctype=Standard -URIDate 2017-03-09 + 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 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 2017-01-01 -Paragraph 141 -Subparagraph e -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2017-03-01&anchor=para_141_e&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 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 2017-01-01 -Paragraph 140 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2017-03-01&anchor=para_140_a&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The decrease (increase) in the net defined benefit liability (asset) resulting from payments from the plan in respect of settlements. [Refer: Gains (losses) arising from settlements, net defined benefit liability (asset); Net defined benefit liability (asset); Defined benefit plans [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2017-01-01 -Paragraph 141 -Subparagraph g -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2017-03-01&anchor=para_141_g&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The fair value of defined benefit plan assets. Plan assets comprise assets held by a long-term employee benefit fund and qualifying insurance policies. [Refer: At fair value [member]] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 19 -IssueDate 2017-01-01 -Paragraph 57 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2017-03-01&anchor=para_57_a&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The decrease (increase) in the net defined benefit liability (asset) resulting from the return on plan assets. 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]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2017-01-01 -Paragraph 141 -Subparagraph c -Clause i -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2017-03-01&anchor=para_141_c_i&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition Defined Benefit Obligations [Roll Forward] + References No definition available. + Details
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- Definition Defined Benefit Plan Assets [Roll Forward] + 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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