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POST-EMPLOYMENT BENEFITS - Summary of Accrued Benefit Obligations (Details) - CAD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022
Changes in net defined benefit liability (asset) [abstract] |  |
Accrued benefit obligations, beginning of year | $ 83 |
Contributions by employees | 28 | $ 31
Net defined benefit plan (assets) accrued benefit obligations, ending balance | 94 | 83
Domestic defined benefit plans |  |
Changes in net defined benefit liability (asset) [abstract] |  |
Accrued benefit obligations, beginning of year | (298) |
Current service cost | 76 | 124
Pension expense, recognized in employee salaries and benefits expense | (62) | (123)
Net interest cost, recognized in finance costs | (18) | (5)
Remeasurements, recognized in other comprehensive income and equity | 191 | (269)
Net defined benefit plan (assets) accrued benefit obligations, ending balance | (76) | (298)
Domestic defined benefit plans | Accrued benefit obligation |  |
Changes in net defined benefit liability (asset) [abstract] |  |
Accrued benefit obligations, beginning of year | 2,430 | 3,171
Current service cost | 76 | 124
Net interest cost, recognized in finance costs | 116 | 103
Benefits paid | (89) | (93)
Impact of annuitization | (736) |
Impact of Shaw Transaction | 55 | 0
Contributions by employees | 28 | 31
Remeasurements, recognized in other comprehensive income and equity | 380 | (906)
Net defined benefit plan (assets) accrued benefit obligations, ending balance | 2,260 | 2,430
Domestic defined benefit plans | Plan assets |  |
Changes in net defined benefit liability (asset) [abstract] |  |
Accrued benefit obligations, beginning of year | (2,770) | (3,198)
Net interest cost, recognized in finance costs | (134) | (108)
Benefits paid | (89) | (93)
Impact of annuitization | (737) | 0
Impact of Shaw Transaction | 67 | 0
Contributions by employees | 28 | 31
Net defined benefit plan (assets) accrued benefit obligations, ending balance | (2,339) | (2,770)
Unfunded supplemental benefits for certain executives | Accrued benefit obligation |  |
Changes in net defined benefit liability (asset) [abstract] |  |
Accrued benefit obligations, beginning of year | 83 | 96
Pension expense, recognized in employee salaries and benefits expense | 9 | 13
Net interest cost, recognized in finance costs | 5 | 4
Benefits paid | (9) | (6)
Remeasurements, recognized in other comprehensive income and equity | 6 | (24)
Net defined benefit plan (assets) accrued benefit obligations, ending balance | $ 94 | $ 83

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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 2023-01-01 -Paragraph 141 -Subparagraph f -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2023-en-r&anchor=para_141_f&doctype=Standard -URIDate 2023-03-23 + 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 2023-01-01 -Paragraph 141 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2023-en-r&anchor=para_141_a&doctype=Standard -URIDate 2023-03-23 + 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 2023-01-01 -Paragraph 141 -Subparagraph c -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2023-en-r&anchor=para_141_c&doctype=Standard -URIDate 2023-03-23 + Details
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- Definition The increase (decrease) in the net defined benefit liability (asset) resulting from business combinations and disposals. [Refer: Business combinations [member]; Net defined benefit liability (asset)] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2023-01-01 -Paragraph 141 -Subparagraph h -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2023-en-r&anchor=para_141_h&doctype=Standard -URIDate 2023-03-23 + 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 2023-01-01 -Paragraph 141 -Subparagraph b -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2023-en-r&anchor=para_141_b&doctype=Standard -URIDate 2023-03-23 + 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 2023-01-01 -Paragraph 140 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2023-en-r&anchor=para_140_a&doctype=Standard -URIDate 2023-03-23 + 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 2023-01-01 -Paragraph 141 -Subparagraph g -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2023-en-r&anchor=para_141_g&doctype=Standard -URIDate 2023-03-23 + 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 2023-01-01 -Paragraph 5 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2023-en-r&anchor=para_5&doctype=Standard -URIDate 2023-03-23 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 19 -IssueDate 2023-01-01 -Paragraph 135 -Subparagraph b -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2023-en-r&anchor=para_135_b&doctype=Standard -URIDate 2023-03-23 + Details
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