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Acquisitions - Narrative (Details) - CAD ($) $ in Millions |  |  | 12 Months Ended |
--- | --- | --- | --- | ---
Dec. 19, 2018 | Oct. 03, 2017 | Dec. 31, 2018 | Dec. 31, 2017
Disclosure of detailed information about business combination [line items] |  |  |  |
Goodwill |  |  | $ 5,412 | $ 5,183
Intangible asset useful life |  |  | 40 years |
GreenOak |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |
Business Combination, Rights To Entity Earnings, Term | 8 years 6 months |  |  |
Company's right to percent of earnings following business combination | 90.00% |  |  |
Percentage of voting shares of certain legal entities acquired | 56.00% |  |  |
FWD |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |
Fair value of consideration transferred |  | $ 105 |  |
Cash transferred |  | 92 |  |
Liabilities incurred |  | $ 13 |  |
Distribution agreement term |  | 15 years |  |
Intangible assets |  | $ 61 |  |
Goodwill |  | 16 |  |
Deferred tax liabilities recognised as of acquisition date |  | 10 |  |
Fair value of net identifiable assets acquired |  | $ 89 |  |
Client Relationships | FWD |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |
Intangible asset useful life |  | 30 years |  |
Distribution Intangible Assets | FWD |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |
Intangible asset useful life |  | 15 years |  |

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