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Share-Based Payments - Narrative (Details) | 12 Months Ended
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Dec. 31, 2019 CAD ($) shares $ / shares | Dec. 31, 2018 CAD ($) $ / shares
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |
Average share price at the date of exercise of stock options (in CAD per share) | $ / shares | $ 53.22 | $ 53.28
Compensation expense | $ 549,000,000 | $ 346,000,000
Weighted average share price, share options granted (in CAD per share) | $ / shares | $ 5.56 | $ 7.00
Liabilities accrued | $ 235,000 | $ 308,000
Stock Option |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |
Vesting period | 4 years |
Maximum exercise period | 10 years |
Maximum number of common shares that may be issued under the Executive Stock Option Plan | shares | 29,525,000 |
Compensation expense | $ 4,000,000 | 3,000,000
Employee Share Ownership Plan |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |
Compensation expense | $ 8,000,000 | 8,000,000
Required service period | 1 year |
Employee's contribution, percentage match | 50.00% |
Annual compensation match maximum, amount | $ 1,500 |
U.S. Employee Stock Purchase Plan |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |
Annual compensation match maximum, amount | $ 25,000 |
Sun Share Plan |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |
Number of other equity instruments granted in share-based payment arrangement | shares | 1 |
Number of trading days prior to grant date used for unit valuation | 5 days |
General unit holding period | 36 months |
MFS Investment Management Share-Based Awards |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |
Vesting period | 4 years |
Compensation expense | $ 332,000,000 | 248,000,000
Liabilities accrued | 810,000,000 | 831,000,000
MFS Investment Management Stock Options, Restricted Shares, and Outstanding Shares |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |
Liabilities accrued | $ 644,000,000 | $ 677,000,000
Top of range | Employee Share Ownership Plan |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |
Employee contribution election | 20.00% |
Employee's annual compensation, percentage match | 5.00% |
Top of range | U.S. Employee Stock Purchase Plan |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |
Employee contribution election | 10.00% |
Top of range | Sun Share Plan |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |
Performance factor multiplier | 2 |
Bottom of range | Employee Share Ownership Plan |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |
Employee contribution election | 1.00% |
Bottom of range | U.S. Employee Stock Purchase Plan |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |
Employee contribution election | 1.00% |
Discount rate | 10.00% |
Bottom of range | Sun Share Plan |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |
Performance factor multiplier | 0 |

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- Definition The amount of expense from share-based payment transactions with employees. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2019-01-01 -Paragraph 112 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2019-en-r&anchor=para_112_c&doctype=Standard -URIDate 2019-03-27 + Details
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- Definition The amount of liabilities arising from share-based payment transactions. Share-based payment transactions are transactions in which the entity: (a) receives goods or services from the supplier of those goods or services (including an employee) in a share-based payment arrangement; or (b) incurs an obligation to settle the transaction with the supplier in a share-based payment arrangement when another group entity receives those goods or services. [Refer: Share-based payment arrangements [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 2 -IssueDate 2019-01-01 -Paragraph 51 -Subparagraph b -Clause i -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2019-en-r&anchor=para_51_b_i&doctype=Standard -URIDate 2019-03-27 + Details
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- Definition The number of other equity instruments (ie other than share options) granted in a share-based payment arrangement. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 2 -IssueDate 2019-01-01 -Paragraph 47 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2019-en-r&anchor=para_47_b&doctype=Standard -URIDate 2019-03-27 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Name IFRS -Number 2 -IssueDate 2019-01-01 -Paragraph 45 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2019-en-r&anchor=para_45&doctype=Standard -URIDate 2019-03-27 + Details
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