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financial instruments - Accounts receivable (Details) - Customer accounts receivable - CAD ($) $ in Millions | 6 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Jun. 30, 2026 | Mar. 31, 2026 | Dec. 31, 2025 | Jun. 30, 2025 | Mar. 31, 2025 | Dec. 31, 2024
Credit risk |  |  |  |  |  |
Days after the billing date that accounts receivables are considered to be past due (in default) | 30 days |  |  |  |  |
Total financial assets | $ 3,095 |  | $ 3,265 |  |  |
Receivable account balances - Current | 2,543 |  | 2,679 |  |  |
Receivable account balances - Non-current | 552 |  | 586 |  |  |
Accounts receivable written off directly to doubtful accounts expense | 0 |  |  |  |  |
Cost/Gross amount |  |  |  |  |  |
Credit risk |  |  |  |  |  |
Total financial assets | 3,234 |  | 3,408 |  |  |
Receivable account balances - Current | 2,669 |  | 2,809 |  |  |
Receivable account balances - Non-current | 565 |  | 599 |  |  |
Allowance for doubtful accounts |  |  |  |  |  |
Credit risk |  |  |  |  |  |
Total financial assets | (139) | $ (145) | (143) | $ (139) | $ (139) | $ (134)
Receivable account balances - Current | (126) |  | (130) |  |  |
Receivable account balances - Non-current | (13) |  | (13) |  |  |
Less than 30 days past billing date |  |  |  |  |  |
Credit risk |  |  |  |  |  |
Total financial assets | 1,113 |  | 979 |  |  |
Less than 30 days past billing date | Cost/Gross amount |  |  |  |  |  |
Credit risk |  |  |  |  |  |
Total financial assets | 1,131 |  | 1,002 |  |  |
Less than 30 days past billing date | Allowance for doubtful accounts |  |  |  |  |  |
Credit risk |  |  |  |  |  |
Total financial assets | (18) |  | (23) |  |  |
30-60 days past billing date |  |  |  |  |  |
Credit risk |  |  |  |  |  |
Total financial assets | 319 |  | 447 |  |  |
30-60 days past billing date | Cost/Gross amount |  |  |  |  |  |
Credit risk |  |  |  |  |  |
Total financial assets | 336 |  | 466 |  |  |
30-60 days past billing date | Allowance for doubtful accounts |  |  |  |  |  |
Credit risk |  |  |  |  |  |
Total financial assets | (17) |  | (19) |  |  |
61-90 days past billing date |  |  |  |  |  |
Credit risk |  |  |  |  |  |
Total financial assets | 75 |  | 125 |  |  |
61-90 days past billing date | Cost/Gross amount |  |  |  |  |  |
Credit risk |  |  |  |  |  |
Total financial assets | 96 |  | 146 |  |  |
61-90 days past billing date | Allowance for doubtful accounts |  |  |  |  |  |
Credit risk |  |  |  |  |  |
Total financial assets | (21) |  | (21) |  |  |
More than 90 days past billing date |  |  |  |  |  |
Credit risk |  |  |  |  |  |
Total financial assets | 131 |  | 161 |  |  |
More than 90 days past billing date | Cost/Gross amount |  |  |  |  |  |
Credit risk |  |  |  |  |  |
Total financial assets | 177 |  | 206 |  |  |
More than 90 days past billing date | Allowance for doubtful accounts |  |  |  |  |  |
Credit risk |  |  |  |  |  |
Total financial assets | (46) |  | (45) |  |  |
Unbilled customer finance receivables |  |  |  |  |  |
Credit risk |  |  |  |  |  |
Total financial assets | 1,457 |  | 1,553 |  |  |
Unbilled customer finance receivables | Cost/Gross amount |  |  |  |  |  |
Credit risk |  |  |  |  |  |
Total financial assets | 1,494 |  | 1,588 |  |  |
Unbilled customer finance receivables | Allowance for doubtful accounts |  |  |  |  |  |
Credit risk |  |  |  |  |  |
Total financial assets | $ (37) |  | $ (35) |  |  |

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