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	3 Months Ended			6 Months Ended		48 Months Ended
	Jun. 30, 2016	Mar. 31, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015	Dec. 31, 2013
Net AEP adverse development before consideration of LPT	$ 0	$ 200	$ 150	$ 200	$ 150	$ 900
Provision for uncollectible third-party reinsurance on AEP	0		0	0	0
Additional amounts ceded under LPT	0		150	200	150
Retroactive reinsurance benefit recognized	(9)		(66)	(82)	(71)
Pretax impact of deferred retroactive reinsurance benefit	$ (9)		$ 84	$ 118	$ 79