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Contingencies - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended
Dec. 24, 2015
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2014
Dec. 31, 2016
Property and Casualty Group          
Loss Contingencies [Line Items]          
Increase in asbestos and environmental reserves   $ 36 $ 67 $ 24  
Liability for asbestos and environmental reserves         $ 443
Reinsurance recoverables on asbestos and environmental reserves, net of allowance         106
Former railroad and manufacturing operations          
Loss Contingencies [Line Items]          
Increase in asbestos and environmental reserves   $ 5 $ 12 $ 6  
American Premier and its subsidiaries          
Loss Contingencies [Line Items]          
Liability for environmental and other claims         77
GAFRI          
Loss Contingencies [Line Items]          
Liability for environmental and other claims         $ 9
Run-off long-term care insurance business          
Loss Contingencies [Line Items]          
Contingent capital support agreement term 5 years