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Stock-based compensation - Narrative (Details) - CAD ($) $ / shares in Units, $ in Millions |  | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Dec. 31, 2024 | Jun. 30, 2025 | Mar. 31, 2025 | Jun. 30, 2024 | Jun. 30, 2025 | Jun. 30, 2024 | Dec. 31, 2022
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Stock-based compensation expense |  | $ 59 |  | $ 9 | $ 92 | $ 68 |
Stock Options |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Number of options issued (in shares) |  |  |  |  | 967,335 |  |
Options issued, weighted average price per share (In cad per share) |  |  |  |  | $ 110.48 |  |
Expiration period (in years) |  |  |  |  | 7 years |  |
Stock options grant date fair value |  |  |  |  | $ 28 |  |
Stock Options | Minimum |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Vesting period (in years or months) |  |  |  |  | 12 months |  |
Stock Options | Maximum |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Vesting period (in years or months) |  |  |  |  | 48 months |  |
Performance Share Units (PSUs) |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Units issued (in shares) |  |  |  |  | 611,516 |  | 415,660
Grant date fair value |  |  |  |  | $ 68 |  |
Number of trading days |  |  |  |  | 30 days |  |
Cash payout of associated shares (in shares) |  |  | 381,759 |  |  |  |
Performance Share Units (PSUs) | Share-based Payment Arrangement, Tranche One |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
PSU payout percentage |  |  |  |  | 120.00% |  |
Cash payout |  |  | $ 48 |  |  |  |
Performance Deferred Share Units (PDSUs) |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Units issued (in shares) |  |  |  |  | 24,149 |  | 13,506
Grant date fair value |  |  |  |  | $ 3 |  |
Number of units that can be granted as percentage of shares acquired |  | 25.00% |  |  | 25.00% |  |
Vested in period (in shares) | 9,774 |  |  |  |  |  |
Payout in future periods | $ 2 |  |  |  |  |  |
PSUs and PDSUs | Minimum |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Vesting period (in years or months) |  |  |  |  | 3 years |  |
PSUs and PDSUs | Maximum |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Vesting period (in years or months) |  |  |  |  | 4 years |  |

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