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Contracts assets and liabilities | 12 Months Ended
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Dec. 31, 2020
Revenue From Contract With Customer1 [Abstract] |
Contracts assets and liabilities, contract costs |
Note 14 | Contract assets and 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.
Note 15 | Contract costs
The table below provides a reconciliation of the contract costs balance.
FOR THE YEAR ENDED DECEMBER 31 | NOTE | 2020 | 2019
Opening balance, January 1 |  | 783 |  | 707 |
Incremental costs of obtaining a contract and contract fulfillment costs |  | 535 |  | 602 |
Amortization included in operating costs |  | (552) |  | (523) |
Impairment charges included in operating costs |  | — |  | (3) |
Discontinued operations | 3 |  | (2) |  | — |
Ending balance, December 31 |  | 764 |  | 783 |
Contract costs are amortized over a period ranging from 12 to 84 months.
Note 32 | Remaining performance obligations
The following table shows revenues expected to be recognized in the future related to performance obligations that are unsatisfied (or partially unsatisfied) as at December 31, 2020.
| 2021 | 2022 | 2023 | 2024 | 2025 | THEREAFTER | TOTAL
Wireline | 1,411 |  | 1,098 |  | 593 |  | 371 |  | 180 |  | 530 |  | 4,183 |
Wireless | 1,645 |  | 635 |  | 44 |  | 1 |  | 1 |  | 1 |  | 2,327 |
Total | 3,056 |  | 1,733 |  | 637 |  | 372 |  | 181 |  | 531 |  | 6,510 |
When estimating minimum transaction prices allocated to the remaining unfulfilled, or partially unfulfilled, performance obligations, BCE applied the practical expedient to not disclose information about remaining performance obligations that have an original expected duration of one year or less and for those contracts where we bill the same value as that which is transferred to the customer.

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