Condensed Consolidated Statements of Income - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Revenues [Abstract]
Earned premiums	$ 1,191	$ 1,127	$ 3,518	$ 3,332
Investment income, net of expenses	148	143	442	422
Realized investment gains, net	56	3	161	110
Fee revenues	5	4	11	10
Other revenues	2	1	5	5
Total revenues	1,402	1,278	4,137	3,879
Benefits and Expenses
Insurance losses and contract holders' benefits	753	670	2,298	2,131
Underwriting, acquisition and insurance expenses	380	348	1,106	1,033
Interest expense	13	14	39	40
Other operating expenses	3	3	10	10
Total benefits and expenses	1,149	1,035	3,453	3,214
Income Before Income Taxes	253	243	684	665
Provision for Income Taxes
Current	60	64	173	180
Deferred	13	5	20	7
Total provision for income taxes	73	69	193	187
Net Income	$ 180	$ 174	$ 491	$ 478
Per Common Share
Net income-basic (in USD per share)	$ 1.09	$ 1.06	$ 2.98	$ 2.91
Net income-diluted (in USD per share)	$ 1.08	$ 1.05	$ 2.95	$ 2.89