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Reinsurance (Reinsurance Recoverable on Ceded Reinsurance) (Details) - USD ($)
$ in Millions
Sep. 30, 2020
Dec. 31, 2019
Sep. 30, 2019
[1]
Dec. 31, 2018
Ceded Credit Risk [Line Items]        
Reinsurance Recoverable for Unpaid Claims and Claims Adjustments $ 14,767 [1] $ 14,181 $ 14,332 $ 14,689
Reinsurance Recoverable for Paid Claims and Claims Adjustments 903 1,000    
Reinsurance recoverable on losses and loss expenses, net of valuation allowance – $320 and $316 15,670 15,181    
Reinsurance recoverable on policy benefits 203 197    
Reinsurance Recoverables on Unpaid Losses, Allowance 255 240    
Reinsurance Recoverables on Paid Losses, Allowance 65 76    
Reinsurance Recoverable, Allowance for Credit Loss 320 316    
Reinsurance Recoverables on Future Policy Benefits, Allowance $ 4 $ 4    
[1] Net of valuation allowance for uncollectible reinsurance.