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Contingencies (Details) - USD ($)
$ in Millions
3 Months Ended
Dec. 24, 2015
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2013
Dec. 31, 2015
Property and Casualty Group [Member]          
Loss Contingencies [Line Items]          
Increase in asbestos and environmental reserves   $ 67 $ 24 $ 54  
Liability for asbestos and environmental reserves         $ 426
Reinsurance recoverables on asbestos and environmental reserves, net of allowance         99
Former railroad and manufacturing operations [Member]          
Loss Contingencies [Line Items]          
Increase in environmental and other reserves   $ 12 $ 6 $ 22  
American Premier and its subsidiaries [Member]          
Loss Contingencies [Line Items]          
Liability for environmental and other claims         77
GAFRI [Member]          
Loss Contingencies [Line Items]          
Liability for environmental and other claims         $ 11
Run-off long-term care insurance business [Member]          
Loss Contingencies [Line Items]          
Contingent capital support agreement term 5 years