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Post-employee benefit plans - Components of Post-Employment Benefit (Obligations) Assets (Details) - CAD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019
Disclosure of net defined benefit liability (asset) [line items] |  |
Post-employment benefit obligations, January 1 | $ (1,349) |
Interest on obligations | (46) | $ (63)
Actuarial gains (losses) | 732 | 191
Post-employment benefit obligations, December 31 | (685) | (1,349)
Post-employment benefit assets | 1,277 | 558
Post-employment benefit obligations | (1,962) | (1,907)
Experience gains (losses) included in actuarial gains | 2,613 | 2,525
Actual return on plan assets | $ 3,434 | $ 3,633
Actual return on plan assets percent | 13.70% | 16.00%
Benefit obligations |  |
Disclosure of net defined benefit liability (asset) [line items] |  |
Post-employment benefit obligations, January 1 | $ (27,179) | $ (24,873)
Current service cost | (221) | (196)
Interest on obligations | (828) | (927)
Actuarial gains (losses) | (1,920) | (2,578)
Benefit payments | 1,409 | 1,403
Employee contributions | (10) | (10)
Other | 0 | 2
Post-employment benefit obligations, December 31 | (28,749) | (27,179)
Plan assets |  |
Disclosure of net defined benefit liability (asset) [line items] |  |
Post-employment benefit obligations, January 1 | 25,850 | 23,358
Interest on obligations | 782 | 864
Actuarial gains (losses) | 2,652 | 2,769
Benefit payments | (1,409) | (1,403)
Employer contributions | 244 | 252
Employee contributions | 10 | 10
Post-employment benefit obligations, December 31 | 28,129 | 25,850
Plan asset (deficit) |  |
Disclosure of net defined benefit liability (asset) [line items] |  |
Post-employment benefit obligations, January 1 | (1,329) |
Post-employment benefit obligations, December 31 | (620) | (1,329)
Effect of asset limit |  |
Disclosure of net defined benefit liability (asset) [line items] |  |
Post-employment benefit obligations, January 1 | (20) |
Post-employment benefit obligations, December 31 | (65) | (20)
DB PENSION PLANS |  |
Disclosure of net defined benefit liability (asset) [line items] |  |
Post-employment benefit obligations, January 1 | (140) |
Current service cost | (219) | (193)
Interest on obligations | (10) | (19)
Post-employment benefit obligations, December 31 | 571 | (140)
Post-employment benefit assets | 1,277 | 558
Post-employment benefit obligations | (706) | (698)
DB PENSION PLANS | Benefit obligations |  |
Disclosure of net defined benefit liability (asset) [line items] |  |
Post-employment benefit obligations, January 1 | (25,650) | (23,404)
Current service cost | (219) | (193)
Interest on obligations | (782) | (872)
Actuarial gains (losses) | (1,830) | (2,498)
Benefit payments | 1,342 | 1,326
Employee contributions | (10) | (10)
Other | 0 | 1
Post-employment benefit obligations, December 31 | (27,149) | (25,650)
DB PENSION PLANS | Plan assets |  |
Disclosure of net defined benefit liability (asset) [line items] |  |
Post-employment benefit obligations, January 1 | 25,530 | 23,071
Interest on obligations | 772 | 853
Actuarial gains (losses) | 2,632 | 2,742
Benefit payments | (1,342) | (1,326)
Employer contributions | 183 | 180
Employee contributions | 10 | 10
Post-employment benefit obligations, December 31 | 27,785 | 25,530
DB PENSION PLANS | Plan asset (deficit) |  |
Disclosure of net defined benefit liability (asset) [line items] |  |
Post-employment benefit obligations, January 1 | (120) |
Post-employment benefit obligations, December 31 | 636 | (120)
DB PENSION PLANS | Effect of asset limit |  |
Disclosure of net defined benefit liability (asset) [line items] |  |
Post-employment benefit obligations, January 1 | (20) |
Post-employment benefit obligations, December 31 | (65) | (20)
OPEB PLANS |  |
Disclosure of net defined benefit liability (asset) [line items] |  |
Post-employment benefit obligations, January 1 | (1,209) |
Current service cost | (2) | (3)
Interest on obligations | (36) | (44)
Post-employment benefit obligations, December 31 | (1,256) | (1,209)
Post-employment benefit assets | 0 | 0
Post-employment benefit obligations | (1,256) | (1,209)
OPEB PLANS | Benefit obligations |  |
Disclosure of net defined benefit liability (asset) [line items] |  |
Post-employment benefit obligations, January 1 | (1,529) | (1,469)
Current service cost | (2) | (3)
Interest on obligations | (46) | (55)
Actuarial gains (losses) | (90) | (80)
Benefit payments | 67 | 77
Employee contributions | 0 | 0
Other | 0 | 1
Post-employment benefit obligations, December 31 | (1,600) | (1,529)
OPEB PLANS | Plan assets |  |
Disclosure of net defined benefit liability (asset) [line items] |  |
Post-employment benefit obligations, January 1 | 320 | 287
Interest on obligations | 10 | 11
Actuarial gains (losses) | 20 | 27
Benefit payments | (67) | (77)
Employer contributions | 61 | 72
Employee contributions | 0 | 0
Post-employment benefit obligations, December 31 | 344 | 320
OPEB PLANS | Plan asset (deficit) |  |
Disclosure of net defined benefit liability (asset) [line items] |  |
Post-employment benefit obligations, January 1 | (1,209) |
Post-employment benefit obligations, December 31 | (1,256) | (1,209)
OPEB PLANS | Effect of asset limit |  |
Disclosure of net defined benefit liability (asset) [line items] |  |
Post-employment benefit obligations, January 1 | 0 |
Post-employment benefit obligations, December 31 | $ 0 | $ 0

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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 2020-01-01 -Paragraph 141 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2020-en-r&anchor=para_141_c&doctype=Standard -URIDate 2020-01-01 + 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 2020-01-01 -Paragraph 141 -Subparagraph f -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2020-en-r&anchor=para_141_f&doctype=Standard -URIDate 2020-01-01 + 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 2020-01-01 -Paragraph 141 -Subparagraph f -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2020-en-r&anchor=para_141_f&doctype=Standard -URIDate 2020-01-01 + 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 2020-01-01 -Paragraph 141 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2020-en-r&anchor=para_141_a&doctype=Standard -URIDate 2020-01-01 + 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 2020-01-01 -Paragraph 141 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2020-en-r&anchor=para_141_c&doctype=Standard -URIDate 2020-01-01 + 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 2020-01-01 -Paragraph 141 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2020-en-r&anchor=para_141&doctype=Standard -URIDate 2020-01-01 + 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 2020-01-01 -Paragraph 141 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2020-en-r&anchor=para_141_b&doctype=Standard -URIDate 2020-01-01 + 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 2020-01-01 -Paragraph 140 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2020-en-r&anchor=para_140_a&doctype=Standard -URIDate 2020-01-01 + Details
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