Condensed Consolidated Statements of Income (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Revenues [Abstract]
Earned premiums	$ 1,094	$ 1,027
Investment income, net of expenses	139	135
Realized investment gains, net	47	22
Fee revenues	3	3
Other revenues	2	2
Total revenues	1,285	1,189
Benefits and Expenses
Insurance losses and policyholder benefits	749	732
Underwriting, acquisition and insurance expenses	345	320
Interest expense	13	14
Other operating expenses	4	4
Total benefits and expenses	1,111	1,070
Income Before Income Taxes	174	119
Provision for Income Taxes
Current	46	20
Deferred	0	8
Total provision for income taxes	46	28
Net Income	$ 128	$ 91
Per Common Share
Net income-basic (in USD per share)	$ 0.78	$ 0.56
Net income-diluted (in USD per share)	$ 0.77	$ 0.55