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Reinsurance (Reinsurance Recoverable on Ceded Reinsurance) (Details) - USD ($)
$ in Millions
Jun. 30, 2021
Dec. 31, 2020
Jun. 30, 2020
Dec. 31, 2019
Ceded Credit Risk [Line Items]        
Reinsurance Recoverable for Unpaid Claims and Claims Adjustments $ 14,721 [1] $ 14,647 $ 14,361 [1] $ 14,181
Reinsurance Recoverable for Paid Claims and Claims Adjustments 1,004 945    
Reinsurance recoverable on losses and loss expenses, net of valuation allowance - $322 and $314 15,725 15,592    
Reinsurance recoverable on policy benefits 203 206    
Reinsurance Recoverables on Unpaid Losses, Allowance 265 257    
Reinsurance Recoverables on Paid Losses, Allowance 57 57    
Reinsurance Recoverable, Allowance for Credit Loss 322 314 $ 303 $ 316
Reinsurance Recoverables on Future Policy Benefits, Allowance $ 4 $ 5    
[1] Net of valuation allowance for uncollectible reinsurance.