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Income Taxes - Movement in Net Deferred Tax Assets (Details) - CAD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017
Reconciliation of changes in deferred tax assets [abstract] |  |
Beginning balance, deferred tax assets | $ 892 | $ 761
Acquisitions (disposals) through business combinations |  | (10)
Charged to statement of operations | (37) | 214
Charged to other comprehensive income | 24 | (64)
Charged to equity, other than other comprehensive income | 9 |
Foreign exchange rate movements | (1) | (9)
Ending balance, deferred tax assets | 887 | 892
Investments |  |
Reconciliation of changes in deferred tax assets [abstract] |  |
Beginning balance, deferred tax assets | (957) | (1,064)
Acquisitions (disposals) through business combinations |  | 0
Charged to statement of operations | 195 | 132
Charged to other comprehensive income | 45 | (73)
Charged to equity, other than other comprehensive income | 0 |
Foreign exchange rate movements | (29) | 48
Ending balance, deferred tax assets | (746) | (957)
Policy liabilities |  |
Reconciliation of changes in deferred tax assets [abstract] |  |
Beginning balance, deferred tax assets | 896 | 517
Acquisitions (disposals) through business combinations |  | 0
Charged to statement of operations | (170) | 388
Charged to other comprehensive income | 0 | 0
Charged to equity, other than other comprehensive income | 0 |
Foreign exchange rate movements | 11 | (9)
Ending balance, deferred tax assets | 737 | 896
Deferred acquisition costs |  |
Reconciliation of changes in deferred tax assets [abstract] |  |
Beginning balance, deferred tax assets | 77 | 171
Acquisitions (disposals) through business combinations |  | 0
Charged to statement of operations | 6 | (74)
Charged to other comprehensive income | 0 | 0
Charged to equity, other than other comprehensive income | 6 |
Foreign exchange rate movements | 7 | (20)
Ending balance, deferred tax assets | 96 | 77
Losses available for carry forward |  |
Reconciliation of changes in deferred tax assets [abstract] |  |
Beginning balance, deferred tax assets | 549 | 513
Acquisitions (disposals) through business combinations |  | 0
Charged to statement of operations | 107 | 43
Charged to other comprehensive income | (13) | (9)
Charged to equity, other than other comprehensive income | 0 |
Foreign exchange rate movements | 5 | 2
Ending balance, deferred tax assets | 648 | 549
Pension and other employee benefits |  |
Reconciliation of changes in deferred tax assets [abstract] |  |
Beginning balance, deferred tax assets | 351 | 410
Acquisitions (disposals) through business combinations |  | 0
Charged to statement of operations | (26) | (66)
Charged to other comprehensive income | (17) | 22
Charged to equity, other than other comprehensive income | 0 |
Foreign exchange rate movements | 11 | (15)
Ending balance, deferred tax assets | 319 | 351
Other |  |
Reconciliation of changes in deferred tax assets [abstract] |  |
Beginning balance, deferred tax assets | (24) | 214
Acquisitions (disposals) through business combinations |  | (10)
Charged to statement of operations | (149) | (209)
Charged to other comprehensive income | 9 | (4)
Charged to equity, other than other comprehensive income | 3 |
Foreign exchange rate movements | (6) | (15)
Ending balance, deferred tax assets | $ (167) | $ (24)

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- Definition The amount of tax expense or income relating to changes in deferred tax liabilities and deferred tax assets, recognised in profit or loss. [Refer: Deferred tax assets; Deferred tax expense (income); Deferred tax liabilities] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 12 -IssueDate 2017-01-01 -Paragraph 81 -Subparagraph g -Clause ii -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=12&date=2017-03-01&anchor=para_81_g_ii&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The amount of deferred tax liabilities or assets. [Refer: Deferred tax liabilities; Deferred tax assets] + 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 + Details
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- Definition The increase (decrease) in deferred tax liability (asset) resulting from business combinations. [Refer: Deferred tax liability (asset)] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 12 -IssueDate 2017-01-01 -Paragraph 81 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=12&date=2017-03-01&anchor=para_81&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The increase (decrease) in deferred tax liability (asset) resulting from the net exchange differences arising when the financial statements are translated from the functional currency into a different presentation currency, including the translation of a foreign operation into the presentation currency of the reporting entity. [Refer: Deferred tax liability (asset)] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 12 -IssueDate 2017-01-01 -Paragraph 81 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=12&date=2017-03-01&anchor=para_81&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition Income Tax Relating To Components Of Equity Other Than Other Comprehensive Income, Related To Deferred Tax Assets, Net + References No definition available. + Details
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