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Fair Value of Assets and Liabilities - Carrying Values and Fair Value Estimates of Financial Instruments (Details) - USD ($)
$ in Millions
Sep. 30, 2018
Dec. 31, 2017
Sep. 30, 2017
Dec. 31, 2016
Financial assets        
Mortgage loans $ 3,923 $ 3,876    
Financial liabilities        
Liability for collateral 536 542 $ 575 $ 550
Notes due to related parties 140 140    
Carrying value        
Financial assets        
Mortgage loans 3,923 3,876    
Agent loans 597 538    
Bank loans 422 437    
Financial liabilities        
Contractholder funds on investment contracts 9,510 10,331    
Liability for collateral 536 542    
Notes due to related parties 140 140    
Fair value        
Financial assets        
Mortgage loans 3,936 4,052    
Agent loans 586 536    
Bank loans 423 437    
Financial liabilities        
Contractholder funds on investment contracts 9,916 11,036    
Liability for collateral 536 542    
Notes due to related parties $ 137 $ 141