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Contracts assets and liabilities (Details) - CAD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Contract assets |  |  |
Beginning balance | $ 724 | $ 665 |
Revenue recognized from contract liabilities included in contract assets at the beginning of the year | 84 | 89 |
Increase in contract liabilities included in contract assets during the year | (88) | (83) |
Increase in contract assets from revenue recognized during the year | 713 | 728 |
Contract assets transferred to trade receivables | (613) | (586) |
Contract terminations transferred to trade receivables | (60) | (50) |
Other | (25) | (39) |
Ending balance | 735 | 724 |
Contract liabilities |  |  |
Opening balance | 1,085 | 1,045 |
Revenue recognized included in contract liabilities at the beginning of the year | (734) | (736) |
Increase in contract liabilities during the year | 785 | 794 |
Contract assets transferred to trade receivables | 8 | 14 |
Acquisitions / (Disposition) | 0 | 8 |
Contract terminations transferred to trade receivables | (1) | (1) |
Other | (55) | (39) |
Ending balance | 1,088 | 1,085 |
Contract assets |  |  |
Contract liabilities |  |  |
Allowance for doubtful accounts | $ 18 | $ 19 | $ 20

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