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	12 Months Ended			48 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2013
Net AEP adverse development before consideration of LPT	$ 150	$ 0	$ 363	$ 900
Provision for uncollectible third-party reinsurance on AEP	0	0	140
Additional amounts ceded under LPT	150	0	503
Retroactive reinsurance benefit recognized	(85)	(13)	(314)
Pretax impact of deferred retroactive reinsurance benefit	$ 65	$ (13)	$ 189