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Contracts assets and liabilities (Details) - CAD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
CONTRACT ASSETS |  |  |
Beginning balance | $ 943 | $ 1,644 |
Revenue recognized from contract liabilities included in contract assets at the beginning of the year | 141 | 188 |
Increase in contract liabilities included in contract assets during the year | (115) | (186) |
Increase in contract assets from revenue recognized during the year | 664 | 834 |
Contract assets transferred to trade receivables | (859) | (1,376) |
Acquisitions | 0 | 0 |
Contract terminations transferred to trade receivables | (89) | (145) |
Discontinued operations | 0 | (1) |
Other | (20) | (15) |
Ending balance | 665 | 943 |
CONTRACT LIABILITIES |  |  |
Opening balance | 959 | 890 |
Revenue recognized included in contract liabilities at the beginning of the year | (678) | (643) |
Increase in contract liabilities during the year | 752 | 688 |
Contract assets transferred to trade receivables | 50 | 51 |
Acquisitions | 13 | 0 |
Contract terminations transferred to trade receivables | 4 | 19 |
Discontinued operations | 0 | 0 |
Reclassified to liabilities held for sale | (7) | 0 |
Other | (48) | (46) |
Ending balance | 1,045 | 959 |
Contract assets |  |  |
CONTRACT LIABILITIES |  |  |
Allowance for doubtful accounts | $ 20 | $ 59 | $ 68

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