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Capital Management - Participating Account Seed Capital (Details)
$ in Millions, $ in Millions
 3 Months Ended 12 Months Ended
Mar. 31, 2018
CAD ($)
Mar. 31, 2018
USD ($)
Dec. 31, 2019
CAD ($)
Dec. 31, 2018
CAD ($)
Shareholders        
Entity Location [Line Items]        
Increase (decrease) in net income (loss) through transfers of interest on seed capital $ 110      
Retained earnings        
Entity Location [Line Items]        
Increase (decrease) through transfer from participating policyholders' equity 89   $ 0 $ 89
Participating policyholders        
Entity Location [Line Items]        
Increase (decrease) in net income (loss) through transfers of interest on seed capital (110)      
Canada | Shareholders        
Entity Location [Line Items]        
Increase (decrease) in net income (loss) through transfers of interest on seed capital 75      
Canada | Retained earnings        
Entity Location [Line Items]        
Increase (decrease) through transfer from participating policyholders' equity 50      
Canada | Participating policyholders        
Entity Location [Line Items]        
Increase (decrease) in net income (loss) through transfers of interest on seed capital (75)      
SLF U.S. | Shareholders        
Entity Location [Line Items]        
Increase (decrease) in net income (loss) through transfers of interest on seed capital 35 $ 28    
SLF U.S. | Retained earnings        
Entity Location [Line Items]        
Increase (decrease) through transfer from participating policyholders' equity 39      
SLF U.S. | Participating policyholders        
Entity Location [Line Items]        
Increase (decrease) in net income (loss) through transfers of interest on seed capital $ (35)