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Contracts assets and liabilities (Details) - CAD ($) $ in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Jan. 01, 2017 | Dec. 31, 2016
CONTRACT ASSETS |  |  |  |
Beginning balance | $ 1,263 | $ 1,121 |  |
Revenue recognized from contract liabilities included in contract assets at the beginning of the year | 154 | 139 |  |
Increase in contract liabilities included in contract assets during the year | (168) | (144) |  |
Increase in contract assets from revenue recognized during the year | 1,770 | 1,483 |  |
Contract assets transferred to trade receivables | (1,321) | (1,172) |  |
Acquisitions | 0 | 50 |  |
Contract terminations transferred to trade receivables | (219) | (207) |  |
Other | 14 | (7) |  |
Ending balance | 1,493 | 1,263 |  |
CONTRACT LIABILITIES |  |  |  |
Opening balance | 894 | 848 |  |
Revenue recognized included in contract liabilities at the beginning of the year | (625) | (634) |  |
Increase in contract liabilities during the year | 628 | 658 |  |
Acquisitions | 13 | 29 |  |
Contract terminations transferred to trade receivables | (4) | (2) |  |
Other | (7) | (5) |  |
Ending balance | 899 | 894 |  |
Contract assets |  |  |  |
CONTRACT LIABILITIES |  |  |  |
Allowance for doubtful accounts | $ 91 | $ 96 | $ 92 | $ 92

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