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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
Mar. 31, 2022
Dec. 31, 2021
Mar. 31, 2021
Dec. 31, 2020
Financial assets        
Mortgage loans, net $ 855 $ 821    
Financial liabilities        
Long-term debt 7,973 7,976    
Liability for collateral 1,504 1,444 $ 1,096 $ 914
Significant unobservable inputs (Level 3) | Amortized cost, net        
Financial assets        
Mortgage loans, net 855 821    
Bank loans 1,520 1,574    
Financial liabilities        
Contractholder funds on investment contracts 54 55    
Significant unobservable inputs (Level 3) | Fair value        
Financial assets        
Mortgage loans, net 847 853    
Bank loans 1,567 1,634    
Financial liabilities        
Contractholder funds on investment contracts 54 55    
Significant other observable inputs (Level 2) | Amortized cost, net        
Financial liabilities        
Long-term debt 7,973 7,976    
Liability for collateral 1,504 1,444    
Significant other observable inputs (Level 2) | Fair value        
Financial liabilities        
Long-term debt 8,424 9,150    
Liability for collateral $ 1,504 $ 1,444