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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, 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   $ 89
Participating policyholders      
Entity Location [Line Items]      
Increase (decrease) in net income (loss) through transfers of interest on seed capital (110)    
SLF Canada | Shareholders      
Entity Location [Line Items]      
Increase (decrease) in net income (loss) through transfers of interest on seed capital 75    
SLF Canada | Retained earnings      
Entity Location [Line Items]      
Increase (decrease) through transfer from participating policyholders' equity 50    
SLF 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 30  
SLF U.S. | Participating policyholders      
Entity Location [Line Items]      
Increase (decrease) in net income (loss) through transfers of interest on seed capital $ (35) $ (28)