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Contracts assets and liabilities (Tables) | 12 Months Ended
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Dec. 31, 2020
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 | NOTE | 2020 | 2019 | 2020 | 2019
Opening balance, January 1 |  | 1,644 |  | 1,493 |  | 890 |  | 899 |
Revenue recognized included in contract liabilities at the beginning of the year |  | — |  | — |  | (643) |  | (666) |
Revenue recognized from contract liabilities included in contract assets at the beginning of the year |  | 188 |  | 131 |  | — |  | — |
Increase in contract liabilities during the year |  | — |  | — |  | 688 |  | 644 |
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) |  | 51 |  | 47 |
Acquisitions |  | — |  | — |  | — |  | (4) |
Contract terminations transferred to trade receivables |  | (145) |  | (205) |  | 19 |  | 24 |
Discontinued operations | 3 |  | (1) |  | — |  | — |  | — |
Other |  | (15) |  | (54) |  | (46) |  | (54) |
Ending balance, December 31 |  | 943 |  | 1,644 |  | 959 |  | 890 |
(1) Net of allowance for doubtful accounts of $59 million and $68 million at December 31, 2020 and December 31, 2019, respectively. See Note 28, Financial and capital management, for additional details.

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- Definition Revenue From Contract With Customer1 [Abstract] + References No definition available. + 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 2020-01-01 -Paragraph 118 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=15&code=ifrs-tx-2020-en-r&anchor=para_118&doctype=Standard -URIDate 2020-01-01 + Details
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