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Reinsurance - Reinsurance Recoverables (Details) - USD ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Ceded Credit Risk [Line Items]    
Net reinsurance recoverables $ 4,061 $ 3,659
Corporate    
Ceded Credit Risk [Line Items]    
Net reinsurance recoverables 349 366
Property and Casualty Insurance Products | Operating Segments    
Ceded Credit Risk [Line Items]    
Paid loss and loss adjustment expenses 84 89
Unpaid loss and loss adjustment expenses [1] 3,496 3,161
Gross reinsurance recoverables 3,580 3,250
Allowance for uncollectible reinsurance (104) (165)
Net reinsurance recoverables 3,476 3,085
Property and Casualty Insurance Products | Commercial Lines | Operating Segments    
Ceded Credit Risk [Line Items]    
Net reinsurance recoverables 688 712
Group Benefits | Operating Segments    
Ceded Credit Risk [Line Items]    
Net reinsurance recoverables $ 236 $ 208