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POST-EMPLOYMENT BENEFITS - Summary of Accrued Benefit Obligations (Details) - CAD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2022 | Dec. 31, 2021
Changes in net defined benefit liability (asset) [abstract] |  |
Accrued benefit obligations, beginning of year | $ 96 |
Contributions by employees | 31 | $ 32
Net defined benefit plan (assets) accrued benefit obligations, ending balance | 83 | 96
Domestic defined benefit plans |  |
Changes in net defined benefit liability (asset) [abstract] |  |
Accrued benefit obligations, beginning of year | (18) |
Current service cost | 124 | 156
Pension expense, recognized in employee salaries and benefits expense | (123) | (171)
Net interest cost, recognized in finance costs | (5) | 11
Remeasurements, recognized in other comprehensive income and equity | (269) | (586)
Net defined benefit plan (assets) accrued benefit obligations, ending balance | (298) | (18)
Domestic defined benefit plans | Accrued benefit obligation |  |
Changes in net defined benefit liability (asset) [abstract] |  |
Accrued benefit obligations, beginning of year | 3,171 | 3,365
Current service cost | 124 | 156
Net interest cost, recognized in finance costs | 103 | 89
Benefits paid | (93) | (99)
Contributions by employees | 31 | 32
Remeasurements, recognized in other comprehensive income and equity | (906) | (372)
Net defined benefit plan (assets) accrued benefit obligations, ending balance | 2,430 | 3,171
Unfunded supplemental benefits for certain executives | Accrued benefit obligation |  |
Changes in net defined benefit liability (asset) [abstract] |  |
Accrued benefit obligations, beginning of year | 96 | 92
Pension expense, recognized in employee salaries and benefits expense | 13 | 12
Net interest cost, recognized in finance costs | 4 | 3
Benefits paid | (6) | (4)
Remeasurements, recognized in other comprehensive income and equity | (24) | (7)
Net defined benefit plan (assets) accrued benefit obligations, ending balance | $ 83 | $ 96

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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 2022-03-24 -Paragraph 141 -Subparagraph f -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2022-en-r&anchor=para_141_f&doctype=Standard -URIDate 2022-03-24 + 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 2022-03-24 -Paragraph 141 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2022-en-r&anchor=para_141_a&doctype=Standard -URIDate 2022-03-24 + 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 2022-03-24 -Paragraph 141 -Subparagraph c -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2022-en-r&anchor=para_141_c&doctype=Standard -URIDate 2022-03-24 + 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 2022-03-24 -Paragraph 141 -Subparagraph b -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2022-en-r&anchor=para_141_b&doctype=Standard -URIDate 2022-03-24 + 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 2022-03-24 -Paragraph 140 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2022-en-r&anchor=para_140_a&doctype=Standard -URIDate 2022-03-24 + 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 2022-03-24 -Paragraph 5 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2022-en-r&anchor=para_5&doctype=Standard -URIDate 2022-03-24 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 19 -IssueDate 2022-03-24 -Paragraph 135 -Subparagraph b -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2022-en-r&anchor=para_135_b&doctype=Standard -URIDate 2022-03-24 + Details
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