Premium Deficiency Reserve (Details) (USD $)	12 Months Ended
	Dec. 31, 2014		Dec. 31, 2013		Dec. 31, 2012
Premium Deficiency Reserve [Abstract]
Present value of expected future premium	$ 387,000,000		$ 432,000,000		$ 445,000,000
Present value of expected future paid losses and expenses	(941,000,000)		(1,101,000,000)		(1,285,000,000)
Net present value of future cash flows	(554,000,000)		(669,000,000)		(840,000,000)
Established loss reserves	530,000,000		621,000,000		766,000,000
Net deficiency	(23,751,000)		(48,461,000)		(73,781,000)
Discount rate utilized	2.10%		1.60%		1.30%
Change in premium deficiency reserve	24,000,000		26,000,000		61,000,000
Premium Deficiency Reserve [Roll Forward]
Premium Deficiency Reserve at beginning of year	(48,461,000)		(73,781,000)		(135,000,000)
Paid claims and loss adjustment expenses	169,000,000		214,000,000		279,000,000
Decrease in loss reserves	(91,000,000)		(145,000,000)		(60,000,000)
Premium earned	(79,000,000)		(96,000,000)		(102,000,000)
Effects of present valuing on future premiums, losses and expenses	(2,000,000)		(1,000,000)		(1,000,000)
Change in premium deficiency reserve to reflect actual premium, losses and expenses recognized	(3,000,000)		(28,000,000)		116,000,000
Change in premium deficiency reserve to reflect change in assumptions relating to future premiums, losses expenses and discount rate	27,000,000	[1]	54,000,000	[1]	(55,000,000)	[1]
Premium Deficiency Reserve at end of year	$ (23,751,000)		$ (48,461,000)		$ (73,781,000)

[1] A positive (negative) number for changes in assumptions relating to premiums, losses, expenses and discount rate indicates a redundancy (deficiency) of prior premium deficiency reserves.