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Accumulated Other Comprehensive Income (Loss) and Non-Controlling Interests - Summary of Changes in Accumulated Other Comprehensive Income (Loss), Net of Tax (Details) - CAD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017
Disclosure of analysis of other comprehensive income by item [line items] |  |
Accumulated other comprehensive income, beginning balance | $ 1,114 | $ 1,669
Other comprehensive income (loss) | 590 | (568)
Other |  | 13
Accumulated other comprehensive income, ending balance | 1,704 | 1,114
Unrealized foreign currency translation gains (losses), net of hedging activities |  |
Disclosure of analysis of other comprehensive income by item [line items] |  |
Accumulated other comprehensive income, beginning balance | 1,012 | 1,749
Other comprehensive income (loss) | 911 | (737)
Accumulated other comprehensive income, ending balance | 1,923 | 1,012
Unrealized gains (losses) on available-for-sale assets |  |
Disclosure of analysis of other comprehensive income by item [line items] |  |
Accumulated other comprehensive income, beginning balance | 346 | 211
Other comprehensive income (loss) | (402) | 135
Accumulated other comprehensive income, ending balance | (56) | 346
Unrealized gains (losses) on cash flow hedges |  |
Disclosure of analysis of other comprehensive income by item [line items] |  |
Accumulated other comprehensive income, beginning balance | (11) | (6)
Other comprehensive income (loss) | (10) | (5)
Accumulated other comprehensive income, ending balance | (21) | (11)
Share of other comprehensive income (loss) in joint ventures and associates |  |
Disclosure of analysis of other comprehensive income by item [line items] |  |
Accumulated other comprehensive income, beginning balance | (31) | 0
Other comprehensive income (loss) | 7 | (31)
Accumulated other comprehensive income, ending balance | (24) | (31)
Remeasurement of defined benefit plans |  |
Disclosure of analysis of other comprehensive income by item [line items] |  |
Accumulated other comprehensive income, beginning balance | (347) | (291)
Other comprehensive income (loss) | 84 | (69)
Other |  | 13
Accumulated other comprehensive income, ending balance | (263) | (347)
Revaluation surplus on transfers to investment properties |  |
Disclosure of analysis of other comprehensive income by item [line items] |  |
Accumulated other comprehensive income, beginning balance | 145 | 6
Other comprehensive income (loss) | 0 | 139
Accumulated other comprehensive income, ending balance | 145 | 145
Participating policyholders |  |
Disclosure of analysis of other comprehensive income by item [line items] |  |
Accumulated other comprehensive income, beginning balance | 9 | 16
Other comprehensive income (loss) | 5 | (7)
Other |  | 0
Accumulated other comprehensive income, ending balance | 14 | 9
Transfer to retained earnings (from accumulated other comprehensive income) | (89) |
Shareholders |  |
Disclosure of analysis of other comprehensive income by item [line items] |  |
Accumulated other comprehensive income, beginning balance | 1,105 | 1,653
Other comprehensive income (loss) |  | (561)
Other |  | 13
Accumulated other comprehensive income, ending balance |  | 1,105
Retained earnings |  |
Disclosure of analysis of other comprehensive income by item [line items] |  |
Transfer to retained earnings (from accumulated other comprehensive income) |  | (13)
Accumulated other comprehensive income (loss), net of taxes |  |
Disclosure of analysis of other comprehensive income by item [line items] |  |
Other comprehensive income (loss) | $ 585 | (561)
Transfer to retained earnings (from accumulated other comprehensive income) |  | $ 13

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- Definition The amount of accumulated items of income and expense (including reclassification adjustments) that are not recognised in profit or loss as required or permitted by other IFRSs. [Refer: IFRSs [member]; Other comprehensive income] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2017-01-01 -Paragraph 55 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_55&doctype=Standard -URIDate 2017-03-09 + Details
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