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Contingencies - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended
Dec. 24, 2015
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2016
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Loss Contingencies [Line Items]                
Reinsurance recoverables on asbestos and environmental reserves, net of allowance         $ 2,942 $ 2,957 $ 2,302 $ 2,201
Property and Casualty Group                
Loss Contingencies [Line Items]                
Increase in asbestos and environmental reserves   $ 18 $ 89 $ 36        
Liability for asbestos and environmental reserves         524      
Former railroad and manufacturing operations                
Loss Contingencies [Line Items]                
Increase in asbestos and environmental reserves   $ 9 $ 24 $ 5        
American Premier and its subsidiaries                
Loss Contingencies [Line Items]                
Liability for environmental and other claims         83      
GAFRI                
Loss Contingencies [Line Items]                
Liability for environmental and other claims         8      
Run-off long-term care and life                
Loss Contingencies [Line Items]                
Contingent capital support agreement amount $ 35              
Contingent capital support agreement term 5 years              
A&E reserves | Property and Casualty Group                
Loss Contingencies [Line Items]                
Reinsurance recoverables on asbestos and environmental reserves, net of allowance         $ 129