Consolidated Statements Of Income - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Revenues
Earned premiums	$ 4,954	$ 4,710	$ 4,480
Investment income, net of expenses	609	595	572
Total	148	124	70
Fee revenues	16	15	13
Other revenues	5	5	7
Total revenues	5,732	5,449	5,142
Benefits and Expenses
Insurance losses and contract holders' benefits	3,390	3,107	2,808
Underwriting, acquisition and insurance expenses	1,546	1,465	1,387
Interest expense	53	53	53
Other operating expenses	13	12	13
Total benefits and expenses	5,002	4,637	4,261
Income Before Income Taxes	730	812	881
Provision (Benefit) for Income Taxes
Current	129	183	231
Deferred	(444)	38	16
Total provision (benefit) for income taxes	(315)	221	247
Net Income	$ 1,045	$ 591	$ 634
Per Common Share
Net income—basic (in usd per share)	$ 6.36	$ 3.59	$ 3.87
Net income—diluted (in usd per share)	$ 6.29	$ 3.55	$ 3.83