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Reinsurance (Earned Consolidated Property Casualty Insurance Premiums On Assumed And Ceded Business) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Reinsurance Premiums for Insurance Companies, by Product Segment [Line Items]
Direct earned premiums	$ 4,468us-gaap_DirectPremiumsEarned	$ 4,151us-gaap_DirectPremiumsEarned	$ 3,755us-gaap_DirectPremiumsEarned
Assumed earned premiums	12us-gaap_AssumedPremiumsEarned	11us-gaap_AssumedPremiumsEarned	9us-gaap_AssumedPremiumsEarned
Ceded earned premiums	(237)us-gaap_CededPremiumsEarned	(260)us-gaap_CededPremiumsEarned	(242)us-gaap_CededPremiumsEarned
Property, Liability and Casualty Insurance Product Line [Member]
Reinsurance Premiums for Insurance Companies, by Product Segment [Line Items]
Direct earned premiums	4,209	3,903	3,520
Assumed earned premiums	12	11	9
Ceded earned premiums	(176)	(201)	(185)
Net earned premiums	$ 4,045	$ 3,713	$ 3,344

- Definition

Amount of earned premiums ceded to other entities.

+ References+ Details