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Commitments and contingencies (Details) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2021 CAD ($) | Dec. 31, 2023 CAD ($) carrier petition | Dec. 31, 2022 CAD ($)
Disclosure of contingent liabilities [line items] |  |  |
Commitments for property, plant and equipment and intangible assets |  | $ 5,758 |
Purchase obligations |  | 3,022 |
Leases committed not yet commenced |  | 8 |
Total |  | $ 9,198 |
Number of major cable carriers | carrier |  | 5 |
Operating revenues |  | $ 24,673 | $ 24,174
Loss contingency, number of petitions | petition |  | 3 |
OUTFRONT Media Inc. |  |  |
Disclosure of contingent liabilities [line items] |  |  |
Business combination, price of acquisition, expected |  | $ 410 |
Legal proceedings contingent liability |  |  |
Disclosure of contingent liabilities [line items] |  |  |
Operating revenues | $ 44 |  |
2024 |  |  |
Disclosure of contingent liabilities [line items] |  |  |
Commitments for property, plant and equipment and intangible assets |  | 2,043 |
Purchase obligations |  | 619 |
Leases committed not yet commenced |  | 2 |
Total |  | 3,074 |
2024 | OUTFRONT Media Inc. |  |  |
Disclosure of contingent liabilities [line items] |  |  |
Business combination, price of acquisition, expected |  | 410 |
2025 |  |  |
Disclosure of contingent liabilities [line items] |  |  |
Commitments for property, plant and equipment and intangible assets |  | 1,513 |
Purchase obligations |  | 513 |
Leases committed not yet commenced |  | 6 |
Total |  | 2,032 |
2025 | OUTFRONT Media Inc. |  |  |
Disclosure of contingent liabilities [line items] |  |  |
Business combination, price of acquisition, expected |  | 0 |
2026 |  |  |
Disclosure of contingent liabilities [line items] |  |  |
Commitments for property, plant and equipment and intangible assets |  | 599 |
Purchase obligations |  | 537 |
Leases committed not yet commenced |  | 0 |
Total |  | 1,136 |
2026 | OUTFRONT Media Inc. |  |  |
Disclosure of contingent liabilities [line items] |  |  |
Business combination, price of acquisition, expected |  | 0 |
2027 |  |  |
Disclosure of contingent liabilities [line items] |  |  |
Commitments for property, plant and equipment and intangible assets |  | 316 |
Purchase obligations |  | 314 |
Leases committed not yet commenced |  | 0 |
Total |  | 630 |
2027 | OUTFRONT Media Inc. |  |  |
Disclosure of contingent liabilities [line items] |  |  |
Business combination, price of acquisition, expected |  | 0 |
2028 |  |  |
Disclosure of contingent liabilities [line items] |  |  |
Commitments for property, plant and equipment and intangible assets |  | 246 |
Purchase obligations |  | 219 |
Leases committed not yet commenced |  | 0 |
Total |  | 465 |
2028 | OUTFRONT Media Inc. |  |  |
Disclosure of contingent liabilities [line items] |  |  |
Business combination, price of acquisition, expected |  | 0 |
THERE- AFTER |  |  |
Disclosure of contingent liabilities [line items] |  |  |
Commitments for property, plant and equipment and intangible assets |  | 1,041 |
Purchase obligations |  | 820 |
Leases committed not yet commenced |  | 0 |
Total |  | 1,861 |
THERE- AFTER | OUTFRONT Media Inc. |  |  |
Disclosure of contingent liabilities [line items] |  |  |
Business combination, price of acquisition, expected |  | $ 0 |

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