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Fair Value of Assets and Liabilities - Financial assets and liabilities (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Financial assets        
Mortgage loans, net $ 3,359 $ 3,988    
Financial liabilities        
Liability for collateral 334 530 $ 525 $ 542
Notes due to related parties 214 214    
Significant unobservable inputs (Level 3) | Amortized cost, net        
Financial assets        
Mortgage loans, net 3,359 3,988    
Bank loans 245 344    
Agent loans 631 666    
Financial liabilities        
Contractholder funds on investment contracts 7,764 8,403    
Notes due to related parties 214 214    
Significant unobservable inputs (Level 3) | Fair value        
Financial assets        
Mortgage loans, net 3,587 4,159    
Bank loans 250 337    
Agent loans 634 664    
Financial liabilities        
Contractholder funds on investment contracts 9,058 9,123    
Notes due to related parties 225 215    
Significant other observable inputs (Level 2) | Amortized cost, net        
Financial liabilities        
Liability for collateral 334 530    
Significant other observable inputs (Level 2) | Fair value        
Financial liabilities        
Liability for collateral $ 334 $ 530