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Share-Based Payments - Narrative (Details)
 12 Months Ended
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