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Retirement Benefit Plans - Summary of Actuarial Valuation of Plans (Detail) $ in Millions, $ in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2020 CAD ($) | Dec. 31, 2019 CAD ($) | Dec. 31, 2020 CAD ($) | Dec. 31, 2020 USD ($) | Dec. 31, 2019 CAD ($) | Dec. 31, 2019 USD ($)
Disclosure of net defined benefit liability (asset) [line items] |  |  |  |  |  |
Interest income (expense) | $ 5 | $ 7 |  |  |  |
Represented by: |  |  |  |  |  |
Pension assets (Note 14) |  |  |  | $ 301 |  | $ 360
Accrued retirement benefit liability |  |  | $ (564) |  | $ (505) |
Defined Benefit Pension Plans |  |  |  |  |  |
Disclosure of net defined benefit liability (asset) [line items] |  |  |  |  |  |
Balance at beginning of year liability (asset) | 259 |  |  |  |  |
Balance at end of year liability (asset) | 182 | 259 |  |  |  |
Funding surplus (deficit) |  |  | 254 |  | 322 |
Represented by: |  |  |  |  |  |
Pension assets (Note 14) |  |  | 301 |  | 360 |
Accrued retirement benefit liability |  |  | (119) |  | (101) |
Net accrued retirement benefit asset (liability) | 182 | 259 | 182 |  | 259 |
Defined Benefit Pension Plans | Defined benefit obligation |  |  |  |  |  |
Disclosure of net defined benefit liability (asset) [line items] |  |  |  |  |  |
Balance at beginning of year liability (asset) | (2,337) | (2,125) |  |  |  |
Current service cost | 55 | 47 |  |  |  |
Benefits paid | (146) | (137) |  |  |  |
Interest income (expense) | (69) | (78) |  |  |  |
Obligation experience adjustments | 27 | 5 |  |  |  |
Effect from change in financial assumptions | 221 | 220 |  |  |  |
Effect from change in demographic assumptions | 1 | 5 |  |  |  |
Changes in foreign exchange rates | 6 | 6 |  |  |  |
Balance at end of year liability (asset) | (2,558) | (2,337) |  |  |  |
Represented by: |  |  |  |  |  |
Net accrued retirement benefit asset (liability) | (2,558) | (2,125) | (2,558) |  | (2,337) |
Defined Benefit Pension Plans | Fair value of plan assets |  |  |  |  |  |
Disclosure of net defined benefit liability (asset) [line items] |  |  |  |  |  |
Balance at beginning of year liability (asset) | 2,659 | 2,423 |  |  |  |
Benefits paid | (146) | (137) |  |  |  |
Interest income (expense) | 79 | 90 |  |  |  |
Changes in foreign exchange rates | (5) | (5) |  |  |  |
Return on plan assets, excluding amounts included in interest income | 204 | 265 |  |  |  |
Contributions by the employer | 21 | 23 |  |  |  |
Balance at end of year liability (asset) | 2,812 | 2,659 |  |  |  |
Represented by: |  |  |  |  |  |
Net accrued retirement benefit asset (liability) | 2,659 | 2,659 | 2,812 |  | 2,659 |
Defined Benefit Pension Plans | Less effect of the asset ceiling |  |  |  |  |  |
Disclosure of net defined benefit liability (asset) [line items] |  |  |  |  |  |
Balance at beginning of year liability (asset) | (63) | (134) |  |  |  |
Interest income (expense) | (2) | (5) |  |  |  |
Change in asset ceiling | 7 | (76) |  |  |  |
Balance at end of year liability (asset) | (72) | (63) |  |  |  |
Represented by: |  |  |  |  |  |
Net accrued retirement benefit asset (liability) | (63) | (63) | (72) |  | (63) |
Non-Pension Post- Retirement Benefit Plans |  |  |  |  |  |
Disclosure of net defined benefit liability (asset) [line items] |  |  |  |  |  |
Balance at beginning of year liability (asset) | (404) |  |  |  |  |
Balance at end of year liability (asset) | (445) | (404) |  |  |  |
Funding surplus (deficit) |  |  | (445) |  | (404) |
Represented by: |  |  |  |  |  |
Pension assets (Note 14) |  |  | 0 |  | 0 |
Accrued retirement benefit liability |  |  | (445) |  | (404) |
Net accrued retirement benefit asset (liability) | (404) | (404) | (445) |  | (404) |
Non-Pension Post- Retirement Benefit Plans | Defined benefit obligation |  |  |  |  |  |
Disclosure of net defined benefit liability (asset) [line items] |  |  |  |  |  |
Balance at beginning of year liability (asset) | (404) | (392) |  |  |  |
Current service cost | 19 | 17 |  |  |  |
Benefits paid | (17) | (19) |  |  |  |
Interest income (expense) | (13) | (16) |  |  |  |
Obligation experience adjustments | (3) | 4 |  |  |  |
Effect from change in financial assumptions | 33 | 45 |  |  |  |
Effect from change in demographic assumptions | (3) | (43) |  |  |  |
Changes in foreign exchange rates | 1 | 8 |  |  |  |
Balance at end of year liability (asset) | (445) | (404) |  |  |  |
Represented by: |  |  |  |  |  |
Net accrued retirement benefit asset (liability) | (445) | (392) | (445) |  | (404) |
Non-Pension Post- Retirement Benefit Plans | Fair value of plan assets |  |  |  |  |  |
Disclosure of net defined benefit liability (asset) [line items] |  |  |  |  |  |
Balance at beginning of year liability (asset) | 0 | 0 |  |  |  |
Benefits paid | (17) | (19) |  |  |  |
Interest income (expense) | 0 | 0 |  |  |  |
Changes in foreign exchange rates | 0 | 0 |  |  |  |
Return on plan assets, excluding amounts included in interest income | 0 | 0 |  |  |  |
Contributions by the employer | 17 | 19 |  |  |  |
Balance at end of year liability (asset) | 0 | 0 |  |  |  |
Represented by: |  |  |  |  |  |
Net accrued retirement benefit asset (liability) | 0 | 0 | 0 |  | 0 |
Non-Pension Post- Retirement Benefit Plans | Less effect of the asset ceiling |  |  |  |  |  |
Disclosure of net defined benefit liability (asset) [line items] |  |  |  |  |  |
Balance at beginning of year liability (asset) | 0 | 0 |  |  |  |
Interest income (expense) | 0 | 0 |  |  |  |
Change in asset ceiling | 0 | 0 |  |  |  |
Balance at end of year liability (asset) | 0 | 0 |  |  |  |
Represented by: |  |  |  |  |  |
Net accrued retirement benefit asset (liability) | $ 0 | $ 0 | $ 0 |  | $ 0 |

X
- 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 2020-01-01 -Paragraph 141 -Subparagraph c -Clause ii -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2020-en-r&anchor=para_141_c_ii&doctype=Standard -URIDate 2020-01-01 + 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 2020-01-01 -Paragraph 141 -Subparagraph c -Clause iii -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2020-en-r&anchor=para_141_c_iii&doctype=Standard -URIDate 2020-01-01 + Details
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- Definition The decrease (increase) in a net defined benefit liability (asset) resulting from actuarial gains (losses) arising from experience adjustments that result in remeasurements of the net defined benefit liability (asset). Experience adjustments deal with the effects of differences between the previous actuarial assumptions and what has actually occurred. [Refer: Net defined benefit liability (asset)] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 19 -IssueDate 2020-01-01 -Paragraph 141 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2020-en-r&anchor=para_141_c&doctype=Standard -URIDate 2020-01-01 + 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 2020-01-01 -Paragraph 141 -Subparagraph f -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2020-en-r&anchor=para_141_f&doctype=Standard -URIDate 2020-01-01 + 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 2020-01-01 -Paragraph 141 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2020-en-r&anchor=para_141_a&doctype=Standard -URIDate 2020-01-01 + 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 the gain (loss) on changes in the effect of limiting a net defined benefit asset to the asset ceiling, excluding amounts included in interest income or expense. [Refer: Interest income; Net defined benefit liability (asset); Interest expense (income), net defined benefit liability (asset)] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2020-01-01 -Paragraph 141 -Subparagraph c -Clause iv -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2020-en-r&anchor=para_141_c_iv&doctype=Standard -URIDate 2020-01-01 + 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 2020-01-01 -Paragraph 141 -Subparagraph e -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2020-en-r&anchor=para_141_e&doctype=Standard -URIDate 2020-01-01 + 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 2020-01-01 -Paragraph 141 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2020-en-r&anchor=para_141_b&doctype=Standard -URIDate 2020-01-01 + 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 2020-01-01 -Paragraph 140 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2020-en-r&anchor=para_140_a&doctype=Standard -URIDate 2020-01-01 + Details
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- Definition The amount of non-current net defined benefit asset. [Refer: Net defined benefit asset] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2020-01-01 -Paragraph 55 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2020-en-r&anchor=para_55&doctype=Standard -URIDate 2020-01-01 + Details
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- Definition The amount of non-current net defined benefit liability. [Refer: Net defined benefit liability] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2020-01-01 -Paragraph 55 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2020-en-r&anchor=para_55&doctype=Standard -URIDate 2020-01-01 + 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 2020-01-01 -Paragraph 141 -Subparagraph g -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2020-en-r&anchor=para_141_g&doctype=Standard -URIDate 2020-01-01 + 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 2020-01-01 -Paragraph 141 -Subparagraph c -Clause i -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2020-en-r&anchor=para_141_c_i&doctype=Standard -URIDate 2020-01-01 + Details
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- References No definition available. + Details
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- Definition The fair value of any plan assets, less the present value of the defined benefit obligation. [Refer: Plan assets [member]] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 19 -IssueDate 2020-01-01 -Paragraph 57 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2020-en-r&anchor=para_57_a&doctype=Standard -URIDate 2020-01-01 + Details
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