Condensed Consolidated Statements of Income (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Revenues [Abstract]
Earned premiums	$ 1,059	$ 954	$ 2,086	$ 1,885
Investment income, net of expenses	136	131	271	259
Realized investment gains, net	14	14	36	55
Fee revenues	3	3	6	4
Other revenues	2	2	4	4
Total revenues	1,214	1,104	2,403	2,207
Benefits and Expenses
Insurance losses and policyholder benefits	763	631	1,495	1,199
Underwriting, acquisition and insurance expenses	328	307	648	607
Interest expense	13	14	27	27
Other operating expenses	3	4	7	9
Total benefits and expenses	1,107	956	2,177	1,842
Income Before Income Taxes	107	148	226	365
Provision for Income Taxes
Current	18	37	38	91
Deferred	5	1	13	10
Total provision for income taxes	23	38	51	101
Net Income	$ 84	$ 110	$ 175	$ 264
Per Common Share
Net income-basic (in USD per share)	$ 0.51	$ 0.67	$ 1.07	$ 1.62
Net income-diluted (in USD per share)	$ 0.51	$ 0.66	$ 1.06	$ 1.60