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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
Sep. 30, 2022
Dec. 31, 2021
Sep. 30, 2021
Dec. 31, 2020
Financial assets        
Mortgage loans $ 833 $ 821    
Financial liabilities        
Long-term debt 7,967 7,976    
Liability for collateral 2,201 1,444 $ 1,481 $ 914
Significant unobservable inputs (Level 3) | Amortized cost, net        
Financial assets        
Mortgage loans 833 821    
Bank loans 748 1,574    
Financial liabilities        
Contractholder funds on investment contracts 52 55    
Significant unobservable inputs (Level 3) | Fair value        
Financial assets        
Mortgage loans 779 853    
Bank loans 738 1,634    
Financial liabilities        
Contractholder funds on investment contracts 52 55    
Significant other observable inputs (Level 2) | Amortized cost, net        
Financial liabilities        
Long-term debt 7,967 7,976    
Liability for collateral 2,201 1,444    
Significant other observable inputs (Level 2) | Fair value        
Financial liabilities        
Long-term debt 7,383 9,150    
Liability for collateral $ 2,201 $ 1,444