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POST-EMPLOYMENT BENEFITS - Summary of Accrued Benefit Obligations (Details) - CAD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023
Changes in net defined benefit liability (asset) [abstract] |  |
Accrued benefit obligations, beginning of year | $ 94 |
Contributions by employees | 25 | $ 28
Net defined benefit plan (assets) accrued benefit obligations, ending balance | 93 | 94
Domestic defined benefit plans |  |
Changes in net defined benefit liability (asset) [abstract] |  |
Accrued benefit obligations, beginning of year | (76) |
Current service cost | 86 | 76
Pension expense, recognized in employee salaries and benefits expense | (81) | (62)
Net interest cost, recognized in finance costs | (8) | (18)
Remeasurements, recognized in other comprehensive income and equity | (176) | 191
Net defined benefit plan (assets) accrued benefit obligations, ending balance | (175) | (76)
Domestic defined benefit plans | Accrued benefit obligation |  |
Changes in net defined benefit liability (asset) [abstract] |  |
Accrued benefit obligations, beginning of year | 2,260 | 2,430
Current service cost | 86 | 76
Net interest cost, recognized in finance costs | 102 | 116
Benefits paid | (51) | (89)
Impact of annuitization | (140) | (736)
Impact of Shaw Transaction | 0 | 55
Contributions by employees | 25 | 28
Remeasurements, recognized in other comprehensive income and equity | (85) | 380
Net defined benefit plan (assets) accrued benefit obligations, ending balance | 2,197 | 2,260
Domestic defined benefit plans | Plan assets |  |
Changes in net defined benefit liability (asset) [abstract] |  |
Accrued benefit obligations, beginning of year | (2,339) | (2,770)
Net interest cost, recognized in finance costs | (110) | (134)
Benefits paid | (51) | (89)
Impact of annuitization | (141) | (737)
Impact of Shaw Transaction | 0 | 67
Contributions by employees | 25 | 28
Net defined benefit plan (assets) accrued benefit obligations, ending balance | (2,385) | (2,339)
Unfunded supplemental benefits for certain executives | Accrued benefit obligation |  |
Changes in net defined benefit liability (asset) [abstract] |  |
Accrued benefit obligations, beginning of year | 94 | 83
Pension expense, recognized in employee salaries and benefits expense | 4 | 9
Net interest cost, recognized in finance costs | 3 | 5
Benefits paid | (7) | (9)
Remeasurements, recognized in other comprehensive income and equity | (1) | 6
Net defined benefit plan (assets) accrued benefit obligations, ending balance | $ 93 | $ 94

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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 [domain]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2024-01-01 -Paragraph 141 -Subparagraph f -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2024-en-r&anchor=para_141_f&doctype=Standard -URIDate 2024-03-27 + 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 2024-01-01 -Paragraph 141 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2024-en-r&anchor=para_141_a&doctype=Standard -URIDate 2024-03-27 + 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 2024-01-01 -Paragraph 141 -Subparagraph c -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2024-en-r&anchor=para_141_c&doctype=Standard -URIDate 2024-03-27 + Details
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- Definition The increase (decrease) in the net defined benefit liability (asset) resulting from business combinations and disposals. [Refer: Total for all business combinations [member]; Net defined benefit liability (asset)] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2024-01-01 -Paragraph 141 -Subparagraph h -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2024-en-r&anchor=para_141_h&doctype=Standard -URIDate 2024-03-27 + 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 2024-01-01 -Paragraph 141 -Subparagraph b -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2024-en-r&anchor=para_141_b&doctype=Standard -URIDate 2024-03-27 + 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 [domain]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2024-01-01 -Paragraph 140 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2024-en-r&anchor=para_140_a&doctype=Standard -URIDate 2024-03-27 + 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 2024-01-01 -Paragraph 141 -Subparagraph g -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2024-en-r&anchor=para_141_g&doctype=Standard -URIDate 2024-03-27 + 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 [domain]] [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 2024-01-01 -Paragraph 5 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2024-en-r&anchor=para_5&doctype=Standard -URIDate 2024-03-27 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 19 -IssueDate 2024-01-01 -Paragraph 135 -Subparagraph b -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2024-en-r&anchor=para_135_b&doctype=Standard -URIDate 2024-03-27 + Details
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