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Fair Value of Assets and Liabilities - Carrying values and fair value estimates (Details) - USD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Financial assets        
Mortgage loans $ 4,670 $ 4,534    
Financial liabilities        
Long-term debt 6,451 6,350    
Liability for collateral 1,458 1,124 $ 1,129 $ 840
Significant other observable inputs (Level 2) | Carrying value        
Financial liabilities        
Long-term debt 6,451 6,350    
Liability for collateral 1,458 1,124    
Significant other observable inputs (Level 2) | Fair value        
Financial liabilities        
Long-term debt 6,708 7,199    
Liability for collateral 1,458 1,124    
Significant unobservable inputs (Level 3) | Carrying value        
Financial assets        
Mortgage loans 4,670 4,534    
Bank loans 1,350 1,702    
Agent loans 620 538    
Financial liabilities        
Contractholder funds on investment contracts 9,250 10,367    
Significant unobservable inputs (Level 3) | Fair value        
Financial assets        
Mortgage loans 4,703 4,732    
Bank loans 1,298 1,704    
Agent loans 617 536    
Financial liabilities        
Contractholder funds on investment contracts $ 9,665 $ 11,071