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Significant accounting policies (Tables) | 12 Months Ended
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Dec. 31, 2017
Accounting Policies, Changes In Accounting Estimates And Errors [Abstract] |
Disclosure of detailed information about property, plant and equipment |
| ESTIMATED USEFUL LIFE
Property, plant and equipment |
Network infrastructure and equipment | 2 to 40 years
Buildings | 5 to 50 years
Finite-life intangible assets |
Software | 2 to 12 years
Customer relationships | 3 to 26 years
Program and feature film rights | Up to 5 years
FOR THE YEAR ENDED DECEMBER 31, 2017 |  | NETWORK INFRASTRUCTURE AND EQUIPMENT |  | LAND AND BUILDINGS |  | ASSETS UNDER CONSTRUCTION |  | TOTAL(1) |
COST |  |  |  |  |
January 1, 2017 |  | 58,680 |  | 5,572 |  | 1,374 |  | 65,626 |
Additions |  | 2,492 |  | 70 |  | 1,587 |  | 4,149 |
Acquisition through business combinations |  | 653 |  | 264 |  | 76 |  | 993 |
Transfers |  | 775 |  | 77 |  | (1,263 | ) | (411 | )
Retirements and disposals |  | (1,105 | ) | (22 | ) | — |  | (1,127 | )
December 31, 2017 |  | 61,495 |  | 5,961 |  | 1,774 |  | 69,230 |
ACCUMULATED DEPRECIATION |  |  |  |  |
January 1, 2017 |  | 40,233 |  | 3,047 |  | — |  | 43,280 |
Depreciation |  | 2,816 |  | 221 |  | — |  | 3,037 |
Retirements and disposals |  | (1,054 | ) | (19 | ) | — |  | (1,073 | )
Other |  | (39 | ) | (8 | ) | — |  | (47 | )
December 31, 2017 |  | 41,956 |  | 3,241 |  | — |  | 45,197 |
NET CARRYING AMOUNT |  |  |  |  |
January 1, 2017 |  | 18,447 |  | 2,525 |  | 1,374 |  | 22,346 |
December 31, 2017 |  | 19,539 |  | 2,720 |  | 1,774 |  | 24,033 |
(1) | Includes assets under finance leases.
FOR THE YEAR ENDED DECEMBER 31, 2016 | NOTE | NETWORK INFRASTRUCTURE AND EQUIPMENT |  | LAND AND BUILDINGS |  | ASSETS UNDER CONSTRUCTION |  | TOTAL(1) |
COST |  |  |  |  |
January 1, 2016 |  | 57,233 |  | 5,174 |  | 1,287 |  | 63,694 |
Additions |  | 2,361 |  | 120 |  | 1,415 |  | 3,896 |
Acquisition through business combinations |  | 32 |  | 282 |  | 1 |  | 315 |
Transfers |  | 692 |  | 35 |  | (1,325 | ) | (598 | )
Retirements and disposals |  | (1,637 | ) | (39 | ) | (4 | ) | (1,680 | )
Impairment losses recognized in earnings | 8 | (1 | ) | — |  | — |  | (1 | )
December 31, 2016 |  | 58,680 |  | 5,572 |  | 1,374 |  | 65,626 |
ACCUMULATED DEPRECIATION |  |  |  |  |
January 1, 2016 |  | 39,183 |  | 2,881 |  | — |  | 42,064 |
Depreciation |  | 2,672 |  | 205 |  | — |  | 2,877 |
Retirements and disposals |  | (1,591 | ) | (35 | ) | — |  | (1,626 | )
Other |  | (31 | ) | (4 | ) | — |  | (35 | )
December 31, 2016 |  | 40,233 |  | 3,047 |  | — |  | 43,280 |
NET CARRYING AMOUNT |  |  |  |  |
January 1, 2016 |  | 18,050 |  | 2,293 |  | 1,287 |  | 21,630 |
December 31, 2016 |  | 18,447 |  | 2,525 |  | 1,374 |  | 22,346 |
(1) | Includes assets under finance leases.
Finance leases
Disclosure of detailed information about intangible assets |
| ESTIMATED USEFUL LIFE
Property, plant and equipment |
Network infrastructure and equipment | 2 to 40 years
Buildings | 5 to 50 years
Finite-life intangible assets |
Software | 2 to 12 years
Customer relationships | 3 to 26 years
Program and feature film rights | Up to 5 years
|  | FINITE-LIFE | INDEFINITE-LIFE |
FOR THE YEAR ENDED DECEMBER 31, 2017 | NOTE | SOFTWARE |  | CUSTOMER RELATION- SHIPS |  | PROGRAM AND FEATURE FILM RIGHTS |  | OTHER |  | TOTAL |  | BRANDS |  | SPECTRUM AND OTHER LICENCES |  | BROADCAST LICENCES |  | TOTAL |  | TOTAL INTANGIBLE ASSETS |
COST |  |  |  |  |  |  |  |  |  |  |
January 1, 2017 |  | 7,861 |  | 1,159 |  | 682 |  | 350 |  | 10,052 |  | 2,333 |  | 3,288 |  | 2,322 |  | 7,943 |  | 17,995 |
Additions |  | 344 |  | 31 |  | 1,009 |  | 7 |  | 1,391 |  | — |  | — |  | — |  | — |  | 1,391 |
Acquired through business combinations |  | 98 |  | 830 |  | — |  | 103 |  | 1,031 |  | 110 |  | 246 |  | — |  | 356 |  | 1,387 |
Transfers |  | 407 |  | — |  | — |  | — |  | 407 |  | — |  | — |  | (1 | ) | (1 | ) | 406 |
Retirements and disposals |  | (21 | ) | (20 | ) | — |  | (55 | ) | (96 | ) | — |  | — |  | — |  | — |  | (96 | )
Impairment losses recognized in earnings | 8 | — |  | — |  | — |  | (12 | ) | (12 | ) | — |  | — |  | (70 | ) | (70 | ) | (82 | )
Amortization included in operating costs |  | — |  | — |  | (950 | ) | — |  | (950 | ) | — |  | — |  | — |  | — |  | (950 | )
December 31, 2017 |  | 8,689 |  | 2,000 |  | 741 |  | 393 |  | 11,823 |  | 2,443 |  | 3,534 |  | 2,251 |  | 8,228 |  | 20,051 |
ACCUMULATED AMORTIZATION |  |  |  |  |  |  |  |  |  |  |
January 1, 2017 |  | 5,316 |  | 513 |  | — |  | 168 |  | 5,997 |  | — |  | — |  | — |  | — |  | 5,997 |
Amortization |  | 672 |  | 102 |  | — |  | 39 |  | 813 |  | — |  | — |  | — |  | — |  | 813 |
Retirements and disposals |  | (21 | ) | — |  | — |  | (52 | ) | (73 | ) | — |  | — |  | — |  | — |  | (73 | )
Other |  | 9 |  | — |  | — |  | — |  | 9 |  | — |  | — |  | — |  | — |  | 9 |
December 31, 2017 |  | 5,976 |  | 615 |  | — |  | 155 |  | 6,746 |  | — |  | — |  | — |  | — |  | 6,746 |
NET CARRYING AMOUNT |  |  |  |  |  |  |  |  |  |  |
January 1, 2017 |  | 2,545 |  | 646 |  | 682 |  | 182 |  | 4,055 |  | 2,333 |  | 3,288 |  | 2,322 |  | 7,943 |  | 11,998 |
December 31, 2017 |  | 2,713 |  | 1,385 |  | 741 |  | 238 |  | 5,077 |  | 2,443 |  | 3,534 |  | 2,251 |  | 8,228 |  | 13,305 |
|  | FINITE-LIFE | INDEFINITE-LIFE |
FOR THE YEAR ENDED DECEMBER 31, 2016 | NOTE | SOFTWARE |  | CUSTOMER RELATION- SHIPS |  | PROGRAM AND FEATURE FILM RIGHTS |  | OTHER |  | TOTAL |  | BRANDS |  | SPECTRUM AND OTHER LICENCES |  | BROADCAST LICENCES |  | TOTAL |  | TOTAL INTANGIBLE ASSETS |
COST |  |  |  |  |  |  |  |  |  |  |
January 1, 2016 |  | 6,906 |  | 866 |  | 577 |  | 325 |  | 8,674 |  | 2,333 |  | 3,267 |  | 2,334 |  | 7,934 |  | 16,608 |
Additions |  | 412 |  | — |  | 973 |  | 17 |  | 1,402 |  | — |  | 21 |  | — |  | 21 |  | 1,423 |
Acquired through business combinations |  | — |  | 293 |  | — |  | 8 |  | 301 |  | — |  | — |  | — |  | — |  | 301 |
Transfers |  | 615 |  | — |  | — |  | — |  | 615 |  | — |  | — |  | — |  | — |  | 615 |
Retirements and disposals |  | (72 | ) | — |  | — |  | — |  | (72 | ) | — |  | — |  | — |  | — |  | (72 | )
Business dispositions |  | — |  | — |  | — |  | — |  | — |  | — |  | — |  | (4 | ) | (4 | ) | (4 | )
Impairment losses recognized in earnings | 8 |  | — |  | — |  | — |  | — |  | — |  | — |  | — |  | (8 | ) | (8 | ) | (8 | )
Amortization included in operating costs |  | — |  | — |  | (868 | ) | — |  | (868 | ) | — |  | — |  | — |  | — |  | (868 | )
December 31, 2016 |  | 7,861 |  | 1,159 |  | 682 |  | 350 |  | 10,052 |  | 2,333 |  | 3,288 |  | 2,322 |  | 7,943 |  | 17,995 |
ACCUMULATED AMORTIZATION |  |  |  |  |  |  |  |  |  |  |
January 1, 2016 |  | 4,824 |  | 466 |  | — |  | 142 |  | 5,432 |  | — |  | — |  | — |  | — |  | 5,432 |
Amortization |  | 558 |  | 47 |  | — |  | 26 |  | 631 |  | — |  | — |  | — |  | — |  | 631 |
Retirements and disposals |  | (69 | ) | — |  | — |  | — |  | (69 | ) | — |  | — |  | — |  | — |  | (69 | )
Other |  | 3 |  | — |  | — |  | — |  | 3 |  | — |  | — |  | — |  | — |  | 3 |
December 31, 2016 |  | 5,316 |  | 513 |  | — |  | 168 |  | 5,997 |  | — |  | — |  | — |  | — |  | 5,997 |
NET CARRYING AMOUNT |  |  |  |  |  |  |  |  |  |  |
January 1, 2016 |  | 2,082 |  | 400 |  | 577 |  | 183 |  | 3,242 |  | 2,333 |  | 3,267 |  | 2,334 |  | 7,934 |  | 11,176 |
December 31, 2016 |  | 2,545 |  | 646 |  | 682 |  | 182 |  | 4,055 |  | 2,333 |  | 3,288 |  | 2,322 |  | 7,943 |  | 11,998 |
Disclosure of adoption of amended accounting standards | As required, effective January 1, 2017, we adopted the following amended accounting standard.
STANDARD | DESCRIPTION |  | IMPACT
Amendments to IAS 7 – Statement of Cash Flows | Requires enhanced disclosures about changes in liabilities arising from financing activities, including changes from financing cash flows, changes arising from obtaining or losing control of subsidiaries or other businesses, the effect of changes in foreign exchange rates and changes in fair values. |  | The required enhanced disclosures have been provided in Note 27, Additional cash flow information.
Disclosure of future changes to accounting standards | The following new or amended standards and interpretation issued by the IASB have an effective date after December 31, 2017 and have not yet been adopted by BCE.
STANDARD | DESCRIPTION | IMPACT | EFFECTIVE DATE
IFRS 15 – Revenue from Contracts with Customers | Establishes principles to record revenues from contracts for the sale of goods or services, unless the contracts are in the scope of IAS 17 – Leases or other IFRSs. Under IFRS 15, revenue is recognized at an amount that reflects the expected consideration receivable in exchange for transferring goods or services to a customer, applying the following five steps: 1. Identify the contract with a customer 2. Identify the performance obligations in the contract 3. Determine the transaction price 4. Allocate the transaction price to the performance obligations in the contract 5. Recognize revenue when (or as) the entity satisfies a performance obligation The new standard also provides guidance relating to principal versus agent relationships, licences of intellectual property, contract costs and the measurement and recognition of gains and losses on the sale of certain non-financial assets such as property and equipment. Additional disclosures will also be required under the new standard. | IFRS 15 will principally affect the timing of revenue recognition and how we classify revenues between product and service in our Bell Wireless segment. IFRS 15 will also affect how we account for costs to obtain a contract. • Under multiple-element arrangements, revenue allocated to a satisfied performance obligation will no longer be limited to the amount that is not contingent upon the satisfaction of additional performance obligations. Although the total revenue recognized during the term of a contract will be largely unaffected, revenue recognition may be accelerated and reflected ahead of the associated cash inflows. This will result in the recognition of a contract asset on the balance sheet, corresponding to the amount of revenue recognized and not yet billed to a customer. The contract asset will be realized over the term of the customer contract. • As revenues allocated to a satisfied performance obligation are no longer limited to the non-contingent amount, a greater proportion of the total revenue recognized during the term of certain customer contracts will be attributed to a delivered product, resulting in a corresponding decrease in service revenue. • Sales commissions and any other incremental costs of obtaining a contract with a customer will be recognized on the balance sheet and amortized on a systematic basis that is consistent with the period and pattern of transfer to the customer of the related products or services, except as noted below. Under IFRS 15, certain practical expedients are permitted both on transition and on an ongoing basis. • On transition, completed contracts that begin and end within the same annual reporting period and those completed before January 1, 2017 are not restated. Similarly, contracts modified prior to January 1, 2017 are not restated. • When our right to consideration from a customer corresponds directly with the value to the customer of the products and services transferred to date, we will recognize revenue in the amount to which we have a right to invoice. • Costs of obtaining a contract that would be amortized within one year or less will be immediately expensed. We continue to make progress towards adoption of IFRS 15 according to our detailed implementation plan. Changes and enhancements to our existing information technology (IT) systems, business processes, and systems of internal control are being completed. A dedicated project team that leverages key resources throughout the company is in place to effect the necessary changes. | Annual periods beginning on or after January 1, 2018, using a full retrospective approach for all periods presented in the period of adoption.
|  | While our testing and data validation process is ongoing, we expect that the impact of the new standard will be most pronounced in our Bell Wireless segment. • Although total revenue recognized over the term of a customer contract is not expected to change significantly, our preliminary estimate of the impact of adopting IFRS 15 is a decrease in 2017 service revenues within the range of $1.2 billion to $1.4 billion, with a corresponding increase in product revenue. • Total operating revenues less operating costs in 2017 is estimated to increase by approximately $0.1 billion. • Total assets on our January 1, 2017 statement of financial position will increase as we record contract assets and costs to obtain a contract. We currently estimate the value of the gross contract assets to be in the range of $1.1 billion to $1.3 billion and an increase in costs to obtain a contract of approximately $0.3 billion to $0.4 billion, both of which would be recognized through an adjustment to opening retained earnings. • Total liabilities will increase mainly to reflect a resulting $0.4 billion deferred tax liability, also recognized through an adjustment to opening retained earnings. • We do not expect that IFRS 15 will impact our cash flows from operating activities. |
Amendments to IFRS 2 – Share-based Payment | Clarifies the classification and measurement of cash-settled share-based payment transactions that include a performance condition, share-based payment transactions with a net settlement feature for withholding tax obligations, and modifications of a share-based payment transaction from cash-settled to equity-settled. | The amendments to IFRS 2 will not have a significant impact on our financial statements. | Annual periods beginning on or after January 1, 2018.
IFRS 9 – Financial Instruments | Sets out the requirements for recognizing and measuring financial assets, financial liabilities and some contracts to buy and sell non-financial items. IFRS 9 replaces IAS 39 – Financial Instruments: Recognition and Measurement. The new standard establishes a single classification and measurement approach for financial assets that reflects the business model in which they are managed and their cash flow characteristics. It also provides guidance on an entity’s own credit risk relating to financial liabilities and modifies the hedge accounting model to better link the economics of risk management with its accounting treatment. Additional disclosures will also be required under the new standard. | The amendments to IFRS 9 will not have a significant impact on our financial statements. | Annual periods beginning on or after January 1, 2018.
IFRS 16 – Leases | Eliminates the distinction between operating and finance leases for lessees, requiring instead that leases be capitalized by recognizing the present value of the lease payments and showing them either as lease assets (right-of-use assets) or together with property, plant and equipment. If lease payments are made over time, an entity recognizes a financial liability representing its obligation to make future lease payments. A depreciation charge for the lease asset is recorded within operating costs and an interest expense on the lease liability is recorded within finance costs. IFRS 16 does not require a lessee to recognize assets and liabilities for short-term leases and leases of low-value assets, nor does it substantially change lease accounting for lessors. | We continue to make progress towards adoption of IFRS 16 according to our detailed implementation plan. Changes and enhancements to our existing IT systems, business processes and systems of internal control are being designed and tested. It is not yet possible to make a reliable estimate of the impact of the new standard on our financial statements. | Annual periods beginning on or after January 1, 2019, using either a full retrospective approach for all periods presented in the period of adoption or a modified retrospective approach.
International Financial Reporting Interpretations Committee (IFRIC) 23 – Uncertainty over Income Tax Treatments | IFRIC 23 clarifies the application of recognition and measurement requirements in IAS 12 - Income Taxes when there is uncertainty over income tax treatments. It specifically addresses whether an entity considers uncertain tax treatments separately or as a group, the assumptions an entity makes about the examination of tax treatments by taxation authorities, how an entity determines taxable profit (tax loss), tax bases, unused tax losses, unused tax credits and tax rates and how an entity considers changes in facts and circumstances. | We are currently evaluating the impact of IFRIC 23 on our financial statements. | Annual periods beginning on or after January 1, 2019, using either a full retrospective or a modified retrospective approach.

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- Definition The disclosure of detailed information about intangible assets. [Refer: Intangible assets other than goodwill] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 38 -IssueDate 2017-01-01 -Paragraph 118 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=38&date=2017-03-01&anchor=para_118&doctype=Standard -URIDate 2017-03-09 + Details
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