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Reinsurance (Reinsurance Recoverable on Ceded Reinsurance) (Details) - USD ($)
$ in Millions
Mar. 31, 2021
Dec. 31, 2020
Mar. 31, 2020
Dec. 31, 2019
Ceded Credit Risk [Line Items]        
Reinsurance Recoverable for Unpaid Claims and Claims Adjustments $ 14,860 [1] $ 14,647 $ 14,040 [1] $ 14,181
Reinsurance Recoverable for Paid Claims and Claims Adjustments 1,054 945    
Reinsurance recoverable on losses and loss expenses, net of valuation allowance - $317 and $314 15,914 15,592    
Reinsurance recoverable on policy benefits 202 206    
Reinsurance Recoverables on Unpaid Losses, Allowance 258 257    
Reinsurance Recoverables on Paid Losses, Allowance 59 57    
Reinsurance Recoverable, Allowance for Credit Loss 317 314 $ 305 $ 316
Reinsurance Recoverables on Future Policy Benefits, Allowance $ 4 $ 5    
[1] Net of valuation allowance for uncollectible reinsurance.