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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, 2019
Dec. 31, 2018
Sep. 30, 2018
Dec. 31, 2017
Financial assets        
Mortgage loans $ 4,012 $ 3,995    
Financial liabilities        
Liability for collateral 691 525 $ 536 $ 542
Notes due to related parties 140 140    
Level 3 | Carrying value        
Financial assets        
Mortgage loans 4,012 3,995    
Bank loans 363 422    
Agent loans 663 620    
Financial liabilities        
Contractholder funds on investment contracts 8,584 9,213    
Notes due to related parties 140 140    
Level 3 | Fair value        
Financial assets        
Mortgage loans 4,176 4,028    
Bank loans 356 408    
Agent loans 666 617    
Financial liabilities        
Contractholder funds on investment contracts 9,400 9,629    
Notes due to related parties 144 138    
Level 2 | Carrying value        
Financial liabilities        
Liability for collateral 691 525    
Level 2 | Fair value        
Financial liabilities        
Liability for collateral $ 691 $ 525