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employee future benefits - Defined contribution pension plans expense (Details) - CAD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Disclosure of defined contribution plans expense |  |  |
Union pension plan and public service pension plan contributions |  | $ 22 | $ 23
Other defined contribution pension plans |  | 66 | 65
Total |  | $ 88 | $ 88
Forecast |  |  |
Disclosure of defined contribution plans expense |  |  |
Union pension plan and public service pension plan contributions | $ 22 |  |

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- Definition The amount of post-employment benefit expense relating to defined contribution plans. Defined contribution plans are post-employment benefit plans under which an entity pays fixed contributions into a separate entity (a fund) and will have no legal or constructive obligation to pay further contributions if the fund does not hold sufficient assets to pay all employee benefits relating to employee service in the current and prior periods. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2018-01-01 -Paragraph 53 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2018-03-01&anchor=para_53&doctype=Standard -URIDate 2018-03-16 + Details
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Balance Type: | debit
Period Type: | duration

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- Definition Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table. + References No definition available. + Details
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- Definition The amount of traditional post-employment benefit expense relating to defined contribution plans that the entity does not separately disclose in the same statement or note. + References No definition available. + Details
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- Definition The amount of post-employment benefit expense relating to defined contribution plans relating to union pension plan and public service pension plan. + References No definition available. + Details
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- Details
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