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Schedule IV - Reinsurance (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Premiums:
Ceded to other companies, premiums	$ 130us-gaap_CededPremiumsEarned	$ 141us-gaap_CededPremiumsEarned
Net amount	$ 7,402us-gaap_PremiumsEarnedNet	$ 6,676us-gaap_PremiumsEarnedNet

Amount of earned premiums ceded to other entities.

Amount, after premiums ceded to other entities and premiums assumed by the entity, of premiums earned.