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Fair Value of Assets and Liabilities - Schedule of Financial Instruments Not Carried at Fair Value (Details) - USD ($)
$ in Millions
Sep. 30, 2023
Dec. 31, 2022
Sep. 30, 2022
Dec. 31, 2021
Financial assets        
Mortgage loans $ 830 $ 762    
Financial liabilities        
Debt 7,946 7,964    
Liability for collateral 1,746 2,011 $ 2,201 $ 1,444
Significant unobservable inputs (Level 3) | Amortized cost, net        
Financial assets        
Mortgage loans 830 762    
Bank loans 679 686    
Financial liabilities        
Contractholder funds on investment contracts 47 50    
Significant unobservable inputs (Level 3) | Fair value        
Financial assets        
Mortgage loans 752 700    
Bank loans 704 686    
Financial liabilities        
Contractholder funds on investment contracts 47 50    
Significant other observable inputs (Level 2) | Amortized cost, net        
Financial liabilities        
Debt 7,946 7,964    
Liability for collateral 1,746 2,011    
Significant other observable inputs (Level 2) | Fair value        
Financial liabilities        
Debt 7,197 7,449    
Liability for collateral $ 1,746 $ 2,011