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Fair Value of Assets and Liabilities - Schedule of Financial Instruments Not Carried at Fair Value (Details) - USD ($)
$ in Millions
Mar. 31, 2024
Dec. 31, 2023
Mar. 31, 2023
Dec. 31, 2022
Financial assets        
Mortgage loans $ 815 $ 822    
Financial liabilities        
Debt 7,938 7,942    
Liability for collateral 2,049 1,891 $ 1,807 $ 2,011
Significant unobservable inputs (Level 3) | Amortized cost, net        
Financial assets        
Mortgage loans 815 822    
Bank loans 164 224    
Financial liabilities        
Contractholder funds on investment contracts 44 46    
Significant unobservable inputs (Level 3) | Fair value        
Financial assets        
Mortgage loans 762 769    
Bank loans 177 238    
Financial liabilities        
Contractholder funds on investment contracts 44 46    
Significant other observable inputs (Level 2) | Amortized cost, net        
Financial liabilities        
Debt 7,938 7,942    
Liability for collateral 2,049 1,891    
Significant other observable inputs (Level 2) | Fair value        
Financial liabilities        
Debt 7,590 7,655    
Liability for collateral $ 2,049 $ 1,891