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Fair Value of Assets and Liabilities - Schedule of Financial Instruments Not Carried at Fair Value (Details) - USD ($)
$ in Millions
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Financial assets        
Mortgage loans $ 822 $ 762    
Financial liabilities        
Debt 7,942 7,964    
Liability for collateral 1,891 2,011 $ 1,444 $ 914
Significant unobservable inputs (Level 3) | Amortized cost, net        
Financial assets        
Mortgage loans 822 762    
Bank loans 224 686    
Financial liabilities        
Contractholder funds on investment contracts 46 50    
Significant unobservable inputs (Level 3) | Fair value        
Financial assets        
Mortgage loans 769 700    
Bank loans 238 686    
Financial liabilities        
Contractholder funds on investment contracts 46 50    
Significant other observable inputs (Level 2) | Amortized cost, net        
Financial liabilities        
Debt 7,942 7,964    
Liability for collateral 1,891 2,011    
Significant other observable inputs (Level 2) | Fair value        
Financial liabilities        
Debt 7,655 7,449    
Liability for collateral $ 1,891 $ 2,011