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Contracts assets and liabilities (Tables) | 12 Months Ended
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Dec. 31, 2018
Revenue From Contract With Customer1 [Abstract] |
Contract assets and contract liabilities | The table below provides a reconciliation of the significant changes in the contract assets and the contract liabilities balances.
| Contract Assets (1) | Contract liabilities
FOR THE YEAR ENDED DECEMBER 31 | 2018 |  | 2017 |  | 2018 |  | 2017 |
Opening balance, January 1 | 1,263 |  | 1,121 |  | 894 |  | 848 |
Revenue recognized included in contract liabilities at the beginning of the year | — |  | — |  | (625 | ) | (634 | )
Revenue recognized from contract liabilities included in contract assets at the beginning of the year | 154 |  | 139 |  | — |  | — |
Increase in contract liabilities during the year | — |  | — |  | 628 |  | 658 |
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 | — |  | 50 |  | 13 |  | 29 |
Contract terminations transferred to trade receivables | (219 | ) | (207 | ) | (4 | ) | (2 | )
Other | 14 |  | (7 | ) | (7 | ) | (5 | )
Ending balance, December 31 | 1,493 |  | 1,263 |  | 899 |  | 894 |
(1) Net of allowance for doubtful accounts of $91 million, $96 million and $92 million at December 31,2018, December 31, 2017 and January 1, 2017, respectively. See Note 26, Financial and capital management , for additional details.

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- Definition The explanation of the significant changes in the contract assets and the contract liabilities. [Refer: Contract assets; Contract liabilities] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 15 -IssueDate 2018-01-01 -Paragraph 118 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=15&date=2018-03-01&anchor=para_118&doctype=Standard -URIDate 2018-03-16 + Details
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