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Post-employee benefit plans - Defined Benefit Plans Recognized in Comprehensive Income (Details) - CAD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017
Employee Benefits [Abstract] |  |
Cumulative losses recognized directly in equity, January 1 | $ (2,984) | $ (2,646)
Actuarial gains (losses) in other comprehensive income | 79 | (313)
Decrease (increase) in the effect of the asset limit | 13 | (25)
Cumulative losses recognized directly in equity, December 31 | (2,892) | $ (2,984)
Cumulative actuarial losses | 3,138 |
Cumulative decrease in the effect of the asset limit | $ 246 |

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- Definition Employee Benefits [Abstract] + References No definition available. + Details
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- Definition Reserve Of Measurements Of Defined Benefit Plans, Actuarial Gains (Loss), Before Tax + References No definition available. + Details
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- Definition Reserve Of Measurements Of Defined Benefit Plans, Before Tax + References No definition available. + Details
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- Definition Reserve Of Measurements Of Defined Benefit Plans, Effect Of Asset Limit, Before Tax + References No definition available. + Details
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- Definition The decrease (increase) in the net defined benefit liability (asset) resulting from the gain (loss) on changes in the effect of limiting a net defined benefit asset to the asset ceiling, excluding amounts included in interest income or expense. [Refer: Interest income; Net defined benefit liability (asset); Interest expense (income), 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 -Clause iv -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2018-03-01&anchor=para_141_c_iv&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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