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POST-EMPLOYMENT BENEFITS - Summary of Accrued Benefit Obligations (Details) - CAD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020
Changes in net defined benefit liability (asset) [abstract] |  |
Accrued benefit obligations, beginning of year | $ 92 |
Contributions by employees | 32 | $ 34
Net defined benefit plan (assets) accrued benefit obligations, ending balance | 96 | 92
Domestic defined benefit plans |  |
Changes in net defined benefit liability (asset) [abstract] |  |
Accrued benefit obligations, beginning of year | 574 |
Current service cost | 156 | 146
Pension expense, recognized in employee salaries and benefits expense | (171) | (160)
Net interest cost, recognized in finance costs | 11 | 10
Remeasurements, recognized in other comprehensive income and equity | (586) | 113
Net defined benefit plan (assets) accrued benefit obligations, ending balance | (18) | 574
Domestic defined benefit plans | Accrued benefit obligation |  |
Changes in net defined benefit liability (asset) [abstract] |  |
Accrued benefit obligations, beginning of year | 3,365 | 2,900
Current service cost | 156 | 146
Net interest cost, recognized in finance costs | 89 | 91
Benefits paid | (99) | (82)
Contributions by employees | 32 | 34
Remeasurements, recognized in other comprehensive income and equity | (372) | 276
Net defined benefit plan (assets) accrued benefit obligations, ending balance | 3,171 | 3,365
Unfunded supplemental benefits for certain executives | Accrued benefit obligation |  |
Changes in net defined benefit liability (asset) [abstract] |  |
Accrued benefit obligations, beginning of year | 92 | 73
Pension expense, recognized in employee salaries and benefits expense | 12 | 13
Net interest cost, recognized in finance costs | 3 | 3
Benefits paid | (4) | (5)
Remeasurements, recognized in other comprehensive income and equity | (7) | 8
Net defined benefit plan (assets) accrued benefit obligations, ending balance | $ 96 | $ 92

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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 2021-01-01 -Paragraph 141 -Subparagraph f -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2021-en-r&anchor=para_141_f&doctype=Standard -URIDate 2021-03-24 + 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 2021-01-01 -Paragraph 141 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2021-en-r&anchor=para_141_a&doctype=Standard -URIDate 2021-03-24 + 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 2021-01-01 -Paragraph 141 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2021-en-r&anchor=para_141_c&doctype=Standard -URIDate 2021-03-24 + 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 2021-01-01 -Paragraph 141 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2021-en-r&anchor=para_141_b&doctype=Standard -URIDate 2021-03-24 + 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 2021-01-01 -Paragraph 140 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2021-en-r&anchor=para_140_a&doctype=Standard -URIDate 2021-03-24 + Details
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- Definition The amount of post-employment benefit expense included in profit or loss relating to defined benefit plans. [Refer: Profit (loss); Defined benefit plans [member]] [Contrast: Increase (decrease) in net defined benefit liability (asset) resulting from expense (income) in profit or loss] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 19 -IssueDate 2021-01-01 -Paragraph 5 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2021-en-r&anchor=para_5&doctype=Standard -URIDate 2021-03-24 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 19 -IssueDate 2021-01-01 -Paragraph 135 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2021-en-r&anchor=para_135_b&doctype=Standard -URIDate 2021-03-24 + Details
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