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Reinsurance, Allowance (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Reinsurance Disclosures [Abstract]    
Reinsurance Recoverable, Allowance for Credit Loss $ 314 $ 316
Reinsurance Recoverable, Credit Loss Expense (Reversal) 21  
Reinsurance, Loss on Uncollectible Accounts in Period, Amount (25)  
Reinsurance Recoverable, Allowance for Credit Loss, Other $ 2