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Reinsurance - Effects of Reinsurance (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Premiums Earned, Net [Abstract]
Ceded	$ 130us-gaap_CededPremiumsEarned	$ 141us-gaap_CededPremiumsEarned
Net	7,402us-gaap_PremiumsEarnedNet	6,676us-gaap_PremiumsEarnedNet
Reinsurance Recoveries [Abstract]
Reinsurance recoveries	159	181
Individual Life Insurance And Annuity Business Sold [Member]
Premiums Earned, Net [Abstract]
Ceded	41	45
Reinsurance Recoveries [Abstract]
Reinsurance recoveries	86	99
Other Subsegments [Member]
Premiums Earned, Net [Abstract]
Ceded	89	96
Reinsurance Recoveries [Abstract]
Reinsurance recoveries	$ 73	$ 82

Amount of earned premiums ceded to other entities.

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