Condensed Consolidated Statements of Income - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Revenues [Abstract]
Earned premiums	$ 1,247	$ 1,191	$ 3,696	$ 3,518
Investment income, net of expenses	153	148	453	442
Realized investment gains and losses, net	7	56	156	161
Fee revenues	3	5	12	11
Other revenues	2	2	4	5
Total revenues	1,412	1,402	4,321	4,137
Benefits and Expenses
Insurance losses and contract holders' benefits	874	753	2,581	2,298
Underwriting, acquisition and insurance expenses	393	380	1,157	1,106
Interest expense	13	13	39	39
Other operating expenses	3	3	11	10
Total benefits and expenses	1,283	1,149	3,788	3,453
Income Before Income Taxes	129	253	533	684
Provision for Income Taxes
Current	27	60	98	173
Deferred	0	13	32	20
Total provision for income taxes	27	73	130	193
Net Income	$ 102	$ 180	$ 403	$ 491
Per Common Share
Net income-basic (in USD per share)	$ 0.62	$ 1.09	$ 2.45	$ 2.98
Net income-diluted (in USD per share)	$ 0.61	$ 1.08	$ 2.42	$ 2.95