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Post-employee benefit plans - Components of Post-Employment Benefit (Obligations) Assets (Details) - CAD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Jan. 01, 2017
Disclosure of net defined benefit liability (asset) [line items] |  |  |
Post-employment benefit obligations/Fair value of plan assets, January 1 | $ (1,846) |  |
Interest on obligations | (69) | $ (72) |
Actuarial gains (losses) | 79 | (313) |
Post-employment benefit obligations/Fair value of plan assets, December 31 | (1,535) | (1,846) |
Post-employment benefit assets included in other non-current assets | 331 | 262 | $ 403
Post-employment benefit obligations | (1,866) | (2,108) | $ (2,105)
Experience gains (losses) included in actuarial gains | (693) | 911 |
Actual return on plan assets | $ 17 | $ 1,797 |
Actual return on plan assets percent | 0.20% | 8.20% |
Benefit obligations |  |  |
Disclosure of net defined benefit liability (asset) [line items] |  |  |
Post-employment benefit obligations/Fair value of plan assets, January 1 | $ (26,057) | $ (22,537) |
Current service cost | (216) | (214) |
Interest on obligations | (920) | (961) |
Actuarial gains (losses) | 913 | (1,221) |
Net curtailment (losses) gains | (4) | 12 |
Loss on plan transfer | 0 | (6) |
Benefit payments | 1,422 | 1,401 |
Employee contributions | (11) | (10) |
Acquisition of MTS | 0 | (2,682) |
Plan transfer | 0 | 122 |
Other | 0 | 39 |
Post-employment benefit obligations/Fair value of plan assets, December 31 | (24,873) | (26,057) |
Plan assets |  |  |
Disclosure of net defined benefit liability (asset) [line items] |  |  |
Post-employment benefit obligations/Fair value of plan assets, January 1 | 24,244 | 20,843 |
Interest on obligations | 851 | 889 |
Actuarial gains (losses) | (834) | 908 |
Benefit payments | (1,422) | (1,401) |
Employer contributions | 508 | 382 |
Employee contributions | 11 | 10 |
Acquisition of MTS | 0 | 2,735 |
Post-employment benefit obligations/Fair value of plan assets, December 31 | 23,358 | 24,244 |
Plan deficit |  |  |
Disclosure of net defined benefit liability (asset) [line items] |  |  |
Post-employment benefit obligations/Fair value of plan assets, January 1 | (1,813) |  |
Post-employment benefit obligations/Fair value of plan assets, December 31 | (1,515) | (1,813) |
Effect of asset limit |  |  |
Disclosure of net defined benefit liability (asset) [line items] |  |  |
Post-employment benefit obligations/Fair value of plan assets, January 1 | (33) |  |
Post-employment benefit obligations/Fair value of plan assets, December 31 | (20) | (33) |
DB PENSION PLANS |  |  |
Disclosure of net defined benefit liability (asset) [line items] |  |  |
Post-employment benefit obligations/Fair value of plan assets, January 1 | (492) |  |
Current service cost | (213) | (208) |
Interest on obligations | (23) | (18) |
Post-employment benefit obligations/Fair value of plan assets, December 31 | (353) | (492) |
Post-employment benefit assets included in other non-current assets | 331 | 262 |
Post-employment benefit obligations | (684) | (754) |
DB PENSION PLANS | Benefit obligations |  |  |
Disclosure of net defined benefit liability (asset) [line items] |  |  |
Post-employment benefit obligations/Fair value of plan assets, January 1 | (24,404) | (20,853) |
Current service cost | (213) | (208) |
Interest on obligations | (864) | (896) |
Actuarial gains (losses) | 750 | (1,193) |
Net curtailment (losses) gains | (4) | (4) |
Loss on plan transfer | 0 | (6) |
Benefit payments | 1,342 | 1,320 |
Employee contributions | (11) | (10) |
Acquisition of MTS | 0 | (2,677) |
Plan transfer | 0 | 122 |
Other | 0 | 1 |
Post-employment benefit obligations/Fair value of plan assets, December 31 | (23,404) | (24,404) |
DB PENSION PLANS | Plan assets |  |  |
Disclosure of net defined benefit liability (asset) [line items] |  |  |
Post-employment benefit obligations/Fair value of plan assets, January 1 | 23,945 | 20,563 |
Interest on obligations | 841 | 878 |
Actuarial gains (losses) | (817) | 896 |
Benefit payments | (1,342) | (1,320) |
Employer contributions | 433 | 305 |
Employee contributions | 11 | 10 |
Acquisition of MTS | 0 | 2,735 |
Post-employment benefit obligations/Fair value of plan assets, December 31 | 23,071 | 23,945 |
DB PENSION PLANS | Plan deficit |  |  |
Disclosure of net defined benefit liability (asset) [line items] |  |  |
Post-employment benefit obligations/Fair value of plan assets, January 1 | (459) |  |
Post-employment benefit obligations/Fair value of plan assets, December 31 | (333) | (459) |
DB PENSION PLANS | Effect of asset limit |  |  |
Disclosure of net defined benefit liability (asset) [line items] |  |  |
Post-employment benefit obligations/Fair value of plan assets, January 1 | (33) |  |
Post-employment benefit obligations/Fair value of plan assets, December 31 | (20) | (33) |
OPEB PLANS |  |  |
Disclosure of net defined benefit liability (asset) [line items] |  |  |
Post-employment benefit obligations/Fair value of plan assets, January 1 | (1,354) |  |
Current service cost | (3) | (6) |
Interest on obligations | (46) | (54) |
Post-employment benefit obligations/Fair value of plan assets, December 31 | (1,182) | (1,354) |
Post-employment benefit assets included in other non-current assets | 0 | 0 |
Post-employment benefit obligations | (1,182) | (1,354) |
OPEB PLANS | Benefit obligations |  |  |
Disclosure of net defined benefit liability (asset) [line items] |  |  |
Post-employment benefit obligations/Fair value of plan assets, January 1 | (1,653) | (1,684) |
Current service cost | (3) | (6) |
Interest on obligations | (56) | (65) |
Actuarial gains (losses) | 163 | (28) |
Net curtailment (losses) gains | 0 | 16 |
Loss on plan transfer | 0 | 0 |
Benefit payments | 80 | 81 |
Employee contributions | 0 | 0 |
Acquisition of MTS | 0 | (5) |
Plan transfer | 0 | 0 |
Other | 0 | 38 |
Post-employment benefit obligations/Fair value of plan assets, December 31 | (1,469) | (1,653) |
OPEB PLANS | Plan assets |  |  |
Disclosure of net defined benefit liability (asset) [line items] |  |  |
Post-employment benefit obligations/Fair value of plan assets, January 1 | 299 | 280 |
Interest on obligations | 10 | 11 |
Actuarial gains (losses) | (17) | 12 |
Benefit payments | (80) | (81) |
Employer contributions | 75 | 77 |
Employee contributions | 0 | 0 |
Acquisition of MTS | 0 | 0 |
Post-employment benefit obligations/Fair value of plan assets, December 31 | 287 | 299 |
OPEB PLANS | Plan deficit |  |  |
Disclosure of net defined benefit liability (asset) [line items] |  |  |
Post-employment benefit obligations/Fair value of plan assets, January 1 | (1,354) |  |
Post-employment benefit obligations/Fair value of plan assets, December 31 | (1,182) | (1,354) |
OPEB PLANS | Effect of asset limit |  |  |
Disclosure of net defined benefit liability (asset) [line items] |  |  |
Post-employment benefit obligations/Fair value of plan assets, January 1 | 0 |  |
Post-employment benefit obligations/Fair value of plan assets, December 31 | $ 0 | $ 0 |

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- Definition Plan Transfer, Net Defined Benefit Liability (Asset) + References No definition available. + Details
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- Definition Return On Plan Assets, Including Amounts Included In Net Interest On The Net Defined Benefit Liability (Asset) + References No definition available. + Details
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- Definition Return On Plan Assets, Including Amounts Included In Net Interest On The Net Defined Benefit Liability (Asset), Percent + References No definition available. + Details
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- Definition The decrease (increase) in a net defined benefit liability (asset) resulting from actuarial gains (losses) arising from experience adjustments that result in remeasurements of the net defined benefit liability (asset). Experience adjustments deal with the effects of differences between the previous actuarial assumptions and what has actually occurred. [Refer: Net defined benefit liability (asset)] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 19 -IssueDate 2018-01-01 -Paragraph 141 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2018-03-01&anchor=para_141_c&doctype=Standard -URIDate 2018-03-16 + Details
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- Definition The decrease (increase) in net defined benefit liability (asset) resulting from contributions to a defined benefit plan by the employer. [Refer: Net defined benefit liability (asset); Defined benefit plans [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2018-01-01 -Paragraph 141 -Subparagraph f -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2018-03-01&anchor=para_141_f&doctype=Standard -URIDate 2018-03-16 + Details
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- Definition The decrease (increase) in the net defined benefit liability (asset) resulting from contributions to a defined benefit plan by plan participants. [Refer: Net defined benefit liability (asset); Defined benefit plans [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2018-01-01 -Paragraph 141 -Subparagraph f -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2018-03-01&anchor=para_141_f&doctype=Standard -URIDate 2018-03-16 + Details
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- Definition The increase (decrease) in the net defined benefit liability (asset) resulting from employee service in the current period. [Refer: Net defined benefit liability (asset)] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2018-01-01 -Paragraph 141 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2018-03-01&anchor=para_141_a&doctype=Standard -URIDate 2018-03-16 + Details
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- Definition The decrease (increase) in a net defined benefit liability (asset) resulting from the remeasurement of that net defined benefit liability (asset). [Refer: Net defined benefit liability (asset)] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2018-01-01 -Paragraph 141 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2018-03-01&anchor=para_141_c&doctype=Standard -URIDate 2018-03-16 + Details
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- Definition The increase (decrease) in the net defined benefit liability (asset) resulting from business combinations and disposals. [Refer: Business combinations [member]; Net defined benefit liability (asset)] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2018-01-01 -Paragraph 141 -Subparagraph h -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2018-03-01&anchor=para_141_h&doctype=Standard -URIDate 2018-03-16 + Details
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- Definition The increase (decrease) in the net defined benefit liability (asset) resulting from changes that the entity does not separately disclose in the same statement or note. [Refer: Net defined benefit liability (asset)] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 19 -IssueDate 2018-01-01 -Paragraph 141 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2018-03-01&anchor=para_141&doctype=Standard -URIDate 2018-03-16 + Details
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- Definition The increase (decrease) in the net defined benefit liability (asset) resulting from the passage of time. [Refer: Interest expense; Net defined benefit liability (asset)] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2018-01-01 -Paragraph 141 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2018-03-01&anchor=para_141_b&doctype=Standard -URIDate 2018-03-16 + Details
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- Definition The amount of deficit or surplus in a defined benefit plan, adjusted for any effect of limiting a net defined benefit asset to the asset ceiling. [Refer: Defined benefit plans [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2018-01-01 -Paragraph 140 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2018-03-01&anchor=para_140_a&doctype=Standard -URIDate 2018-03-16 + Details
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