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Fair Value of Assets and Liabilities - Carrying Values and Fair Value Estimates of Financial Instruments (Details) - USD ($)
$ in Millions
Mar. 31, 2019
Dec. 31, 2018
Mar. 31, 2018
Dec. 31, 2017
Financial assets        
Mortgage loans $ 4,034 $ 3,995    
Financial liabilities        
Liability for collateral 587 525 $ 461 $ 542
Notes due to related parties 140 140    
Significant unobservable inputs (Level 3) | Carrying value        
Financial assets        
Mortgage loans 4,034 3,995    
Bank loans 394 422    
Agent loans 639 620    
Financial liabilities        
Contractholder funds on investment contracts 8,979 9,213    
Notes due to related parties 140 140    
Significant unobservable inputs (Level 3) | Fair value        
Financial assets        
Mortgage loans 4,132 4,028    
Bank loans 383 408    
Agent loans 639 617    
Financial liabilities        
Contractholder funds on investment contracts 9,590 9,629    
Notes due to related parties 140 138    
Significant other observable inputs (Level 2) | Carrying value        
Financial liabilities        
Liability for collateral 587 525    
Significant other observable inputs (Level 2) | Fair value        
Financial liabilities        
Liability for collateral $ 587 $ 525