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Fair Value of Assets and Liabilities - Carrying values and fair value estimates of financial instruments not carried at fair value (Details) - USD ($)
$ in Millions
Jun. 30, 2023
Dec. 31, 2022
Jun. 30, 2022
Dec. 31, 2021
Financial assets        
Mortgage loans $ 823 $ 762    
Financial liabilities        
Debt 7,949 7,964    
Liability for collateral 1,791 2,011 $ 2,032 $ 1,444
Significant unobservable inputs (Level 3) | Amortized cost, net        
Financial assets        
Mortgage loans 823 762    
Bank loans 667 686    
Financial liabilities        
Contractholder funds on investment contracts 47 50    
Significant unobservable inputs (Level 3) | Fair value        
Financial assets        
Mortgage loans 750 700    
Bank loans 686 686    
Financial liabilities        
Contractholder funds on investment contracts 47 50    
Significant other observable inputs (Level 2) | Amortized cost, net        
Financial liabilities        
Debt 7,949 7,964    
Liability for collateral 1,791 2,011    
Significant other observable inputs (Level 2) | Fair value        
Financial liabilities        
Debt 7,465 7,449    
Liability for collateral $ 1,791 $ 2,011