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Fair Value of Assets and Liabilities - Financial assets and liabilities (Details) - USD ($)
$ in Millions
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Financial assets        
Mortgage loans, net $ 2,951 $ 3,359    
Financial liabilities        
Liability for collateral   334 $ 530 $ 525
Notes due to related parties 0 214    
Significant unobservable inputs (Level 3) | Amortized cost, net        
Financial assets        
Mortgage loans, net 2,951 3,359    
Directly originated corporate loans 937 0    
Aviation loans 197 0    
Bank loans 108 245    
Agent loans 0 631    
Financial liabilities        
Contractholder funds on investment contracts 5,768 7,764    
Notes due to related parties 0 214    
Significant unobservable inputs (Level 3) | Fair value        
Financial assets        
Mortgage loans, net 3,063 3,587    
Directly originated corporate loans 944 0    
Aviation loans 203 0    
Bank loans 110 250    
Agent loans 0 634    
Financial liabilities        
Contractholder funds on investment contracts 6,233 9,058    
Notes due to related parties 0 225    
Significant other observable inputs (Level 2) | Amortized cost, net        
Financial liabilities        
Liability for collateral 0 334    
Significant other observable inputs (Level 2) | Fair value        
Financial liabilities        
Liability for collateral $ 0 $ 334