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Contingencies (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended 3 Months Ended 3 Months Ended
Sep. 30, 2013
Property and Casualty Group [Member]
Sep. 30, 2012
Property and Casualty Group [Member]
Jun. 30, 2011
Property and Casualty Group [Member]
Dec. 31, 2013
Property and Casualty Group [Member]
Sep. 30, 2013
Former railroad and manufacturing operations [Member]
Sep. 30, 2012
Former railroad and manufacturing operations [Member]
Jun. 30, 2011
Former railroad and manufacturing operations [Member]
Dec. 31, 2013
American Premier and its subsidiaries [Member]
Dec. 31, 2013
GAFRI [Member]
Jun. 30, 2013
Property and Casualty Insurance [Member]
Settlement of a significant asbestos claim [Member]
Loss Contingencies [Line Items]                    
Settlement of an asbestos claim in the property and casualty operations                   $ 124
Increase in asbestos and environmental reserves 54 31 50              
Increase in environmental and other reserves         22 2 9      
Liability for asbestos and environmental reserves       384            
Reinsurance recoverables on asbestos and environmental reserves, net of allowance       83            
Liability for environmental and other claims               $ 86 $ 10