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INVESTMENTS - Narrative (Details) - CAD | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016
Interests in Other Entities [Abstract] |  |
Losses on available-for-sale financial assets | CAD 0 | CAD 0
Gains on available-for-sale financial assets | CAD (418,000,000) | CAD (81,000,000)
Maple Leaf Sports and Entertainment Limited (MLSE) |  |
Disclosure of joint ventures [line items] |  |
Proportion of ownership interest | 37.50% |
Glentel |  |
Disclosure of joint ventures [line items] |  |
Proportion of ownership interest | 50.00% |
Parent Company and BCE, Inc. | Maple Leaf Sports and Entertainment Limited (MLSE) |  |
Disclosure of joint ventures [line items] |  |
Proportion of ownership interest | 75.00% |
BCE Inc. | Glentel |  |
Disclosure of joint ventures [line items] |  |
Proportion of ownership interest | 50.00% |

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- Definition The gains (losses) on available-for-sale financial assets. [Refer: Financial assets available-for-sale] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Note Expiry date 2018-01-01 -Name IFRS -Number 7 -IssueDate 2017-01-01 -Paragraph 20 -Subparagraph a -Clause ii -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2017-03-02&anchor=para_20_a_ii&doctype=Standard&book=B -URIDate 2017-03-09 + Details
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