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Reinsurance and Indemnification - Property and casualty reinsurance recoverable (Details) - USD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Reinsurance Retention Policy [Line Items]        
Reinsurance recoverables related to ceded unpaid losses $ 6,912 $ 7,155 $ 6,471 $ 6,184
Property-Liability        
Reinsurance Retention Policy [Line Items]        
Reinsurance and indemnification recoverables, net 7,020 7,270    
Paid 112 111    
Reinsurance recoverables related to ceded unpaid losses 6,910 7,150    
Discontinued Lines and Coverages        
Reinsurance Retention Policy [Line Items]        
Allowance for uncollectible reinsurance $ 60 $ 65