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Reinsurance and indemnification Reinsurance and indemnification - Additional Information (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Jan. 01, 2020
Dec. 31, 2019
Reinsurance            
Reinsurance recoverables $ (75) $ (75) $ (74) $ (74) $ (74)  
Property-Liability            
Reinsurance            
Reinsurance recoverables (59) (59) (59)   (60)  
Allowance for credit loss 0 1        
Annuities, Life Insurance and Other            
Reinsurance            
Reinsurance recoverables (16) (16) $ (15)   $ (14)  
Allowance for credit loss (1) (2)        
Scottish Re            
Reinsurance            
Reinsurance and indemnification recoverables, net $ 62 $ 62       $ 70