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INTANGIBLE ASSETS AND GOODWILL - Changes in net carrying amounts of intangible assets and goodwill (Details) - CAD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Total intangible assets |  |  |
Beginning of period | $ 17,896 |  |
End of period | 17,858 | $ 17,896 |
Goodwill |  |  |
Goodwill at beginning of period | 16,280 |  |
Goodwill at end of period | 16,280 | 16,280 |
Gross Carrying Amount, Before Adjustment |  |  |
Indefinite-life |  |  |
Accumulated impairment losses |  | 118 | $ 118
Finite-life |  |  |
Accumulated impairment losses |  | 118 | 118
Total intangible assets |  |  |
Beginning of period | 20,398 | 14,327 |
Accumulated impairment losses |  | 118 | 118
End of period |  | 20,398 | 14,327
Total intangible assets and goodwill |  |  |
Intangible assets and goodwill at beginning of period | 36,899 | 18,579 |
Impairment loss recognised in profit or loss, intangible assets and goodwill |  | (339) | (339)
Intangible assets and goodwill at end of period |  | 36,899 | 18,579
Gross carrying amount |  |  |
Finite-life |  |  |
Acquisitions from business combinations |  | 6,057 |
Total intangible assets |  |  |
Beginning of period | 20,280 | 14,209 |
Additions | 582 | 77 |
Acquisitions from business combinations |  | 6,057 |
Disposals and other | (87) | (63) |
End of period | 20,775 | 20,280 | 14,209
Total intangible assets and goodwill |  |  |
Intangible assets and goodwill at beginning of period | 36,560 | 18,240 |
Additions | 582 | 77 |
Acquisitions from business combinations, intangible assets and goodwill |  | 18,306 |
Disposals and other | (87) | (63) |
Intangible assets and goodwill at end of period | 37,055 | 36,560 | 18,240
Accumulated amortization |  |  |
Total intangible assets |  |  |
Beginning of period | 2,384 | 1,958 |
Amortization | 603 | 489 |
Disposals and other | (70) | (63) |
End of period | 2,917 | 2,384 | 1,958
Total intangible assets and goodwill |  |  |
Intangible assets and goodwill at beginning of period | 2,384 | 1,958 |
Accumulated impairment losses | 603 | 489 |
Disposals and other | (70) | (63) |
Intangible assets and goodwill at end of period | 2,917 | 2,384 | 1,958
Net carrying amount |  |  |
Total intangible assets |  |  |
Beginning of period | 17,896 | 12,251 |
End of period | 17,858 | 17,896 | 12,251
Total intangible assets and goodwill |  |  |
Intangible assets and goodwill at beginning of period | 34,176 | 16,282 |
Intangible assets and goodwill at end of period | 34,138 | 34,176 | 16,282
Customer relationships | Gross Carrying Amount, Before Adjustment |  |  |
Indefinite-life |  |  |
Accumulated impairment losses |  | 0 | 0
Finite-life |  |  |
Beginning of period | 7,604 | 1,674 |
Accumulated impairment losses |  | 0 | 0
End of period |  | 7,604 | 1,674
Total intangible assets |  |  |
Accumulated impairment losses |  | 0 | 0
Customer relationships | Gross carrying amount |  |  |
Finite-life |  |  |
Beginning of period | 7,604 | 1,674 |
Additions | 8 | 0 |
Acquisitions from business combinations |  | 5,930 |
Disposals and other | 0 | 0 |
End of period | 7,612 | 7,604 | 1,674
Total intangible assets |  |  |
Acquisitions from business combinations |  | 5,930 |
Customer relationships | Accumulated amortization |  |  |
Finite-life |  |  |
Beginning of period | 2,025 | 1,627 |
Amortization | 513 | 398 |
Disposals and other | 0 | 0 |
End of period | 2,538 | 2,025 | 1,627
Customer relationships | Net carrying amount |  |  |
Finite-life |  |  |
Beginning of period | 5,579 | 47 |
End of period | 5,074 | 5,579 | 47
Acquired program rights | Gross Carrying Amount, Before Adjustment |  |  |
Indefinite-life |  |  |
Accumulated impairment losses |  | 5 | 5
Finite-life |  |  |
Beginning of period | 200 | 189 |
Accumulated impairment losses |  | 5 | 5
End of period |  | 200 | 189
Total intangible assets |  |  |
Accumulated impairment losses |  | 5 | 5
Acquired program rights | Gross carrying amount |  |  |
Finite-life |  |  |
Beginning of period | 195 | 184 |
Additions | 72 | 74 |
Acquisitions from business combinations |  | 0 |
Disposals and other | (72) | (63) |
End of period | 195 | 195 | 184
Total intangible assets |  |  |
Acquisitions from business combinations |  | 0 |
Acquired program rights | Accumulated amortization |  |  |
Finite-life |  |  |
Beginning of period | 68 | 61 |
Amortization | 62 | 70 |
Disposals and other | (70) | (63) |
End of period | 60 | 68 | 61
Acquired program rights | Net carrying amount |  |  |
Finite-life |  |  |
Beginning of period | 127 | 123 |
End of period | 135 | 127 | 123
Brand names | Gross Carrying Amount, Before Adjustment |  |  |
Indefinite-life |  |  |
Accumulated impairment losses |  |  | 0
Finite-life |  |  |
Beginning of period | 75 | 0 |
Accumulated impairment losses |  |  | 0
End of period |  | 75 | 0
Total intangible assets |  |  |
Accumulated impairment losses |  |  | 0
Brand names | Gross carrying amount |  |  |
Finite-life |  |  |
Beginning of period | 75 | 0 |
Additions | 22 | 0 |
Acquisitions from business combinations |  | 75 |
Disposals and other | 0 | 0 |
End of period | 97 | 75 | 0
Total intangible assets |  |  |
Acquisitions from business combinations |  | 75 |
Brand names | Accumulated amortization |  |  |
Finite-life |  |  |
Beginning of period | 19 | 0 |
Amortization | 25 | 19 |
Disposals and other | 0 | 0 |
End of period | 44 | 19 | 0
Brand names | Net carrying amount |  |  |
Finite-life |  |  |
Beginning of period | 56 | 0 |
End of period | 53 | 56 | 0
Other intangible assets | Gross Carrying Amount, Before Adjustment |  |  |
Indefinite-life |  |  |
Accumulated impairment losses |  |  | 0
Finite-life |  |  |
Beginning of period | 52 | 0 |
Accumulated impairment losses |  |  | 0
End of period |  | 52 | 0
Total intangible assets |  |  |
Accumulated impairment losses |  |  | 0
Other intangible assets | Gross carrying amount |  |  |
Finite-life |  |  |
Beginning of period | 52 | 0 |
Additions | 0 | 0 |
Acquisitions from business combinations |  | 52 |
Disposals and other | 0 | 0 |
End of period | 52 | 52 | 0
Total intangible assets |  |  |
Acquisitions from business combinations |  | 52 |
Other intangible assets | Accumulated amortization |  |  |
Finite-life |  |  |
Beginning of period | 2 | 0 |
Amortization | 3 | 2 |
Disposals and other | 0 | 0 |
End of period | 5 | 2 | 0
Other intangible assets | Net carrying amount |  |  |
Finite-life |  |  |
Beginning of period | 50 | 0 |
End of period | 47 | 50 | 0
Goodwill | Gross Carrying Amount, Before Adjustment |  |  |
Goodwill |  |  |
Goodwill at beginning of period | 16,501 | 4,252 |
Impairment loss recognised in profit or loss, goodwill |  | (221) | (221)
Goodwill at end of period |  | 16,501 | 4,252
Goodwill | Gross carrying amount |  |  |
Goodwill |  |  |
Goodwill at beginning of period | 16,280 | 4,031 |
Additions | 0 | 0 |
Acquisitions from business combinations, goodwill |  | 12,249 |
Disposals and other | 0 | 0 |
Goodwill at end of period | 16,280 | 16,280 | 4,031
Goodwill | Net carrying amount |  |  |
Goodwill |  |  |
Goodwill at beginning of period | 16,280 | 4,031 |
Goodwill at end of period | 16,280 | 16,280 | 4,031
Customer relationships, brand names, and other | Accumulated depreciation and amortisation |  |  |
Total intangible assets |  |  |
Amortization | 541 | 419 |
Spectrum licences | Gross Carrying Amount, Before Adjustment |  |  |
Indefinite-life |  |  |
Beginning of period | 11,717 | 11,714 |
Accumulated impairment losses |  | 0 | 0
Period end |  | 11,717 | 11,714
Finite-life |  |  |
Accumulated impairment losses |  | 0 | 0
Total intangible assets |  |  |
Accumulated impairment losses |  | 0 | 0
Spectrum licences | Gross carrying amount |  |  |
Indefinite-life |  |  |
Beginning of period | 11,717 | 11,714 |
Additions | 480 | 3 |
Disposals and other | 0 | 0 |
Period end | 12,197 | 11,717 | 11,714
Spectrum licences | Accumulated amortization |  |  |
Indefinite-life |  |  |
Beginning of period | 0 | 0 |
Disposals and other | 0 | 0 |
Period end | 0 | 0 | 0
Spectrum licences | Net carrying amount |  |  |
Indefinite-life |  |  |
Beginning of period | 11,717 | 11,714 |
Period end | 12,197 | 11,717 | 11,714
Broadcast licences | Gross Carrying Amount, Before Adjustment |  |  |
Indefinite-life |  |  |
Beginning of period | 330 | 330 |
Accumulated impairment losses |  | 99 | 99
Period end |  | 330 | 330
Finite-life |  |  |
Accumulated impairment losses |  | 99 | 99
Total intangible assets |  |  |
Accumulated impairment losses |  | 99 | 99
Broadcast licences | Gross carrying amount |  |  |
Indefinite-life |  |  |
Beginning of period | 231 | 231 |
Additions | 0 | 0 |
Disposals and other | (15) | 0 |
Period end | 216 | 231 | 231
Broadcast licences | Accumulated amortization |  |  |
Indefinite-life |  |  |
Beginning of period | 0 | 0 |
Disposals and other | 0 | 0 |
Period end | 0 | 0 | 0
Broadcast licences | Net carrying amount |  |  |
Indefinite-life |  |  |
Beginning of period | 231 | 231 |
Period end | 216 | 231 | 231
Brand names | Gross Carrying Amount, Before Adjustment |  |  |
Indefinite-life |  |  |
Beginning of period | 420 | 420 |
Accumulated impairment losses |  | 14 | 14
Period end |  | 420 | 420
Finite-life |  |  |
Accumulated impairment losses |  | 14 | 14
Total intangible assets |  |  |
Accumulated impairment losses |  | 14 | 14
Brand names | Gross carrying amount |  |  |
Indefinite-life |  |  |
Beginning of period | 406 | 406 |
Additions | 0 | 0 |
Disposals and other | 0 | 0 |
Period end | 406 | 406 | 406
Brand names | Accumulated amortization |  |  |
Indefinite-life |  |  |
Beginning of period | 270 | 270 |
Disposals and other | 0 | 0 |
Period end | 270 | 270 | 270
Brand names | Net carrying amount |  |  |
Indefinite-life |  |  |
Beginning of period | 136 | 136 |
Period end | $ 136 | $ 136 | $ 136

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