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Share-Based Payments - Narrative (Details)
 12 Months Ended
Dec. 31, 2018
CAD ($)
shares
$ / shares
Dec. 31, 2017
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) $ 53.28 $ 49.98
Compensation expense $ 346,000,000 $ 476,000,000
Weighted average share price, share options granted (in CAD per share) | $ / shares $ 7,000,000.00 $ 9.41
Liabilities accrued $ 300,000 $ 235,000
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 $ 0 3,000,000
Employee Share Ownership Plan    
Disclosure of terms and conditions of share-based payment arrangement [line items]    
Compensation expense $ 8,000,000 7,000,000
Required service period 1 year  
Employee's contribution, percentage match 50.00%  
Annual compensation match maximum, amount $ 1,500  
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  
Liabilities accrued $ 0 844,000,000
MFS Investment Management Stock Options, Restricted Shares, and Outstanding Shares    
Disclosure of terms and conditions of share-based payment arrangement [line items]    
Liabilities accrued $ 0 $ 0
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 | 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 | Sun Share Plan    
Disclosure of terms and conditions of share-based payment arrangement [line items]    
Performance factor multiplier 0