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Income taxes - Reconciliation of Reported Income Taxes in the Income Statement (Details) - CAD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017
Income Taxes [Abstract] |  |
Net earnings (losses) | $ 2,973 | $ 3,050
Add back income taxes | 995 | 1,069
Earnings before income taxes | $ 3,968 | $ 4,119
Applicable statutory tax rate | 27.00% | 27.10%
Income taxes computed at applicable statutory rates | $ (1,071) | $ (1,116)
Non-taxable portion of losses on investments | (9) | (1)
Uncertain tax positions | 68 | 16
Effect of change in provincial corporate tax rate | 0 | (3)
Change in estimate relating to prior periods | 20 | 51
Non-taxable portion of equity losses | (10) | (10)
Other | 7 | (6)
Total income taxes | $ (995) | $ (1,069)
Average effective tax rate | 25.10% | 25.90%

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- Definition The applicable income tax rate. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 12 -IssueDate 2018-01-01 -Paragraph 81 -Subparagraph c -Clause ii -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=12&date=2018-03-01&anchor=para_81_c_ii&doctype=Standard -URIDate 2018-03-16 + Details
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