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Reinsurance and indemnification Reinsurance and indemnification - Additional Information (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Jan. 01, 2020
Dec. 31, 2019
Reinsurance          
Reinsurance recoverables $ (74) $ (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 (15) (15) $ (15) $ (14)  
Allowance for credit loss 0 (1)      
Scottish Re          
Reinsurance          
Reinsurance and indemnification recoverables, net $ 62 $ 62     $ 70