Goodwill (details) - Other Intangible Assets - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014	Dec. 31, 2014
Other intangible assets by major asset class
Intangible assets subject to amortization, gross carrying amount	$ 213		$ 213		$ 669
Intangible assets subject to amortization, accumulated amortization	146		146		582
Intangible assets subject to amortization, net	67		67		87
Amortization expense for other intangible assets	9	$ 11	20	$ 23
Estimated intangible asset amortization expense, remainder of 2015	7		7
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	5		5		460
Intangible assets subject to amortization, accumulated amortization	4		4		446
Intangible assets subject to amortization, net	1		1		14
Amortization expense for other intangible assets	6	7	14	15
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	142		142		136
Intangible assets subject to amortization, net	66		66		$ 73
Amortization expense for other intangible assets	$ 3	$ 4	$ 6	$ 8