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Contingencies (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended	12 Months Ended
	Jun. 30, 2011	Dec. 31, 2011
Property And Casualty Group [Member]
Contingencies (Textual) [Abstract]
Increase in asbestos and environmental reserves	$ 50	$ 50
Liability for asbestos and environmental reserves		454
Reinsurance recoverables on asbestos and environmental reserves, net of allowance		92
Former Railroad And Manufacturing Operations [Member]
Contingencies (Textual) [Abstract]
Increase in environmental and other reserves	9	9
GAFRI [Member]
Contingencies (Textual) [Abstract]
Liability for environmental and other claims		8
American Premier and Its Subsidiaries [Member]
Contingencies (Textual) [Abstract]
Liability for environmental and other claims		$ 84

Total costs accrued as of the balance sheet date for environmental loss contingencies.

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- Definition

Carrying amount as of the balance sheet date of reserves for the costs of settling insured claims and costs incurred in the claims settlement process attributable to asbestos and environmental claims, before estimated recoveries from reinsurers.

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- Definition

Increase in asbestos and environmental reserve based on known and estimated costs of settling insured claims and costs incurred in the claims settlement process, net of estimated reinsurance recoveries.

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