Condensed Consolidated Statements of Income - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Revenues [Abstract]
Earned premiums	$ 1,241	$ 1,173	$ 2,449	$ 2,327
Investment income, net of expenses	151	149	300	294
Realized investment gains and losses, net	(11)	44	149	105
Fee revenues	4	3	9	6
Other revenues	1	2	2	3
Total revenues	1,386	1,371	2,909	2,735
Benefits and Expenses
Insurance losses and contract holders' benefits	854	821	1,707	1,545
Underwriting, acquisition and insurance expenses	387	366	764	726
Interest expense	13	13	26	26
Other operating expenses	4	5	8	7
Total benefits and expenses	1,258	1,205	2,505	2,304
Income Before Income Taxes	128	166	404	431
Provision (Benefit) for Income Taxes
Current	31	48	71	113
Deferred	(3)	(5)	32	7
Total provision for income taxes	28	43	103	120
Net Income	$ 100	$ 123	$ 301	$ 311
Per Common Share
Net income-basic (in USD per share)	$ 0.61	$ 0.75	$ 1.83	$ 1.89
Net income-diluted (in USD per share)	$ 0.60	$ 0.74	$ 1.81	$ 1.87