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Income taxes - Reconciliation of reported income taxes with income taxes calculated (Details) - CAD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016
Income Taxes [Abstract] |  |
Net earnings | $ 2,970 | $ 3,087
Add back income taxes | 1,039 | 1,110
Earnings before income taxes | $ 4,009 | $ 4,197
Applicable statutory tax rate | 27.10% | 27.10%
Income taxes computed at applicable statutory rates | $ (1,086) | $ (1,137)
Non-taxable portion of (losses) gains on investments | (1) | 11
Uncertain tax positions | 16 | (9)
Effect of change in provincial corporate tax rate | (3) | 4
Change in estimate relating to prior periods | 51 | 46
Non-taxable portion of equity losses | (10) | (23)
Other | (6) | (2)
Total income taxes | $ (1,039) | $ (1,110)
Average effective tax rate | 25.90% | 26.40%

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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 2017-01-01 -Paragraph 81 -Subparagraph c -Clause ii -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=12&date=2017-03-01&anchor=para_81_c_ii&doctype=Standard -URIDate 2017-03-09 + Details
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