Goodwill (details) - Other Intangible Assets - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014	Dec. 31, 2014
Other intangible assets by major asset class
Intangible assets subject to amortization, gross carrying amount	$ 212		$ 212		$ 669
Intangible assets subject to amortization, accumulated amortization	149		149		582
Intangible assets subject to amortization, net	63		63		87
Amortization expense for other intangible assets	3	$ 12	23	$ 35
Estimated intangible asset amortization expense, remainder of 2015	3		3
Estimated intangible asset amortization expense, 2016	10		10
Estimated intangible asset amortization expense, 2017	9		9
Estimated intangible asset amortization expense, 2018	7		7
Estimated intangible asset amortization expense, 2019	6		6
Customer-related [Member]
Other intangible assets by major asset class
Intangible assets subject to amortization, gross carrying amount	4		4		460
Intangible assets subject to amortization, accumulated amortization	4		4		446
Intangible assets subject to amortization, net					14
Amortization expense for other intangible assets		8	14	24
Fair value adjustment on claims and claim adjustment expense reserves, reinsurance recoverables and other contract-related intangibles [Member]
Other intangible assets by major asset class
Intangible assets subject to amortization, gross carrying amount	208		208		209
Intangible assets subject to amortization, accumulated amortization	145		145		136
Intangible assets subject to amortization, net	63		63		$ 73
Amortization expense for other intangible assets	$ 3	$ 4	$ 9	$ 11