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Reinsurance - Reinsurance Recoverables (Details) - USD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Ceded Credit Risk [Line Items]    
Reinsurance recoverables, net $ 5,527 $ 4,357
Corporate    
Ceded Credit Risk [Line Items]    
Allowance for uncollectible reinsurance 0 0
Reinsurance recoverables, net 320 332
Property and Casualty Insurance Products | Operating Segments    
Ceded Credit Risk [Line Items]    
Paid loss and loss adjustment expenses 249 127
Unpaid loss and loss adjustment expenses 4,819 3,773
Gross reinsurance recoverables 5,068 3,900
Allowance for uncollectible reinsurance (114) (126)
Reinsurance recoverables, net 4,954 3,774
Group Benefits [Member]    
Ceded Credit Risk [Line Items]    
Allowance for uncollectible reinsurance 0 0
Group Benefits [Member] | Operating Segments    
Ceded Credit Risk [Line Items]    
Reinsurance recoverables, net $ 253 $ 251