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Income Taxes - Narrative (Details) - CAD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Deferred tax assets | $ 1,209 | $ 1,295
Unused tax losses for which a deferred tax asset has not been recognised | 702 | 511
Capital tax losses for which no deferred tax asset recognised | 102 | 100
Temporary differences associated with investments in subsidiaries, branches, joint ventures and associates for which a deferred tax liability has not been recognised | $ 5,723 | $ 5,611
Applicable tax rate | 26.75% | 26.80%
Provisional tax benefit relating to revaluation of deferred tax balances |  | $ 53
One-time deemed repatriation charge |  | 46
Withholding taxes on distributions from foreign subsidiaries | $ 28 | 26
Bottom of range |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Applicable tax rate | 0.00% |
Top of range |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Applicable tax rate | 30.00% |
United States |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Capital losses | $ 0 | 26
United Kingdom |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Capital losses | 460 | 449
Canada |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Capital losses | 176 | 176
Asia |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Benefit related to investments in joint ventures | 16 | 16
Unused tax losses |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Accumulated non-capital tax losses | 3,245 | 2,662
Deferred tax assets | 600 | 543
Unused tax losses | United States |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Deferred tax assets | $ 6 | $ 6

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- Definition The amounts of income taxes recoverable in future periods in respect of: (a) deductible temporary differences; (b) the carryforward of unused tax losses; and (c) the carryforward of unused tax credits. [Refer: Temporary differences [member]; Unused tax credits [member]; Unused tax losses [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 12 -IssueDate 2017-01-01 -Paragraph 81 -Subparagraph g -Clause i -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=12&date=2017-03-01&anchor=para_81_g_i&doctype=Standard -URIDate 2017-03-09 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2017-01-01 -Paragraph 54 -Subparagraph o -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_54_o&doctype=Standard -URIDate 2017-03-09 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2017-01-01 -Paragraph 56 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_56&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The aggregate amount of temporary differences associated with investments in subsidiaries, branches and associates and interests in joint arrangements, for which deferred tax liabilities have not been recognised as a result of satisfying both of the following conditions: (a) the parent, investor, joint venturer or joint operator is able to control the timing of the reversal of the temporary difference; and (b) it is probable that the temporary difference will not reverse in the foreseeable future. [Refer: Associates [member]; Subsidiaries [member]; Temporary differences [member]; Investments in subsidiaries] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 12 -IssueDate 2017-01-01 -Paragraph 81 -Subparagraph f -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=12&date=2017-03-01&anchor=para_81_f&doctype=Standard -URIDate 2017-03-09 + Details
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