Claim and Claim Adjustment Expense Reserves (Impact of Loss Portfolio Transfer on the Consolidated Statement of Operations) (Details) (Loss Portfolio Transfer [Member], USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Loss Portfolio Transfer [Member]
Net AEP adverse development before consideration of LPT		$ 363	$ 261
Provision for uncollectible third-party reinsurance on AEP		140
Additional amounts ceded under LPT		503	261
Retroactive reinsurance benefit recognized	(13)	(314)	(261)
Pretax impact of unrecognized deferred retroactive reinsurance benefit	$ (13)	$ 189