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Fair Value of Assets and Liabilities - Carrying values and fair value estimates (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Financial assets        
Mortgage loans, net $ 4,075 $ 4,817    
Financial liabilities        
Long-term debt 7,825 6,631    
Liability for collateral 1,249 1,829 $ 1,458 $ 1,124
Significant unobservable inputs (Level 3) | Amortized cost, net        
Financial assets        
Mortgage loans, net 4,075 4,817    
Bank loans 1,018 1,204    
Agent loans 631 666    
Financial liabilities        
Contractholder funds on investment contracts 7,795 8,438    
Significant unobservable inputs (Level 3) | Fair value        
Financial assets        
Mortgage loans, net 4,348 5,012    
Bank loans 1,053 1,185    
Agent loans 634 664    
Financial liabilities        
Contractholder funds on investment contracts 9,089 9,158    
Significant other observable inputs (Level 2) | Amortized cost, net        
Financial liabilities        
Long-term debt 7,825 6,631    
Liability for collateral 1,249 1,829    
Significant other observable inputs (Level 2) | Fair value        
Financial liabilities        
Long-term debt 9,489 7,738    
Liability for collateral $ 1,249 $ 1,829