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Contracts assets and liabilities (Details) - CAD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
CONTRACT ASSETS |  |  |
Beginning balance | $ 1,644 | $ 1,493 |
Revenue recognized from contract liabilities included in contract assets at the beginning of the year | 188 | 131 |
Increase in contract liabilities included in contract assets during the year | (186) | (175) |
Increase in contract assets from revenue recognized during the year | 834 | 1,915 |
Contract assets transferred to trade receivables | (1,376) | (1,461) |
Contract assets transferred to trade receivables | (51) | (47) |
Acquisitions | 0 | 0 |
Contract terminations transferred to trade receivables | (145) | (205) |
Discontinued operations | (1) | 0 |
Other | (15) | (54) |
Ending balance | 943 | 1,644 |
CONTRACT LIABILITIES |  |  |
Opening balance | 890 | 899 |
Revenue recognized included in contract liabilities at the beginning of the year | (643) | (666) |
Increase in contract liabilities during the year | 688 | 644 |
Contract assets transferred to trade receivables | 51 | 47 |
Acquisitions | 0 | (4) |
Contract terminations transferred to trade receivables | 19 | 24 |
Discontinued operations | 0 | 0 |
Other | (46) | (54) |
Ending balance | 959 | 890 |
Contract assets |  |  |
CONTRACT LIABILITIES |  |  |
Allowance for doubtful accounts | $ 59 | $ 68 | $ 73

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