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Reinsurance (Reinsurance Recoverable on Ceded Reinsurance) (Details) - USD ($)
$ in Millions
Jun. 30, 2020
Dec. 31, 2019
Jun. 30, 2019
Dec. 31, 2018
Ceded Credit Risk [Line Items]        
Reinsurance Recoverable for Unpaid Claims and Claims Adjustments [1] $ 14,361 $ 14,181 $ 14,233 $ 14,689
Reinsurance Recoverable for Paid Claims and Claims Adjustments 846 1,000    
Reinsurance recoverable on losses and loss expenses, net of valuation allowance - $303 and $316 15,207 15,181    
Reinsurance recoverable on policy benefits 197 197    
Reinsurance Recoverables on Unpaid Losses, Allowance 240 240    
Reinsurance Recoverables on Paid Losses, Allowance 63 76    
Reinsurance Recoverable, Allowance for Credit Loss 303 316    
Reinsurance Recoverables on Future Policy Benefits, Allowance $ 4 $ 4    
[1] Net of valuation allowance for uncollectible reinsurance.