Condensed Consolidated Statements of Operations (Unaudited) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Revenues
Net earned premiums	$ 1,825	$ 1,781	$ 5,389	$ 5,098
Net investment income	597	601	1,808	1,719
Net realized investment gains (losses):
Other-than-temporary impairment losses	(15)	(62)	(49)	(89)
Portion of other-than-temporary impairments recognized in Other comprehensive income (loss)	(2)	(2)	(2)	(25)
Net other-than-temporary impairment losses recognized in earnings	(17)	(64)	(51)	(114)
Other net realized investment gains (losses)	21	72	69	180
Net realized investment gains (losses)	4	8	18	66
Other revenues	78	76	285	230
Total revenues	2,504	2,466	7,500	7,113
Claims, Benefits and Expenses
Insurance claims and policyholders’ benefits	1,414	1,435	4,364	4,164
Amortization of deferred acquisition costs	341	333	1,004	937
Other operating expenses	332	341	993	976
Interest	42	43	125	128
Total claims, benefits and expenses	2,129	2,152	6,486	6,205
Income (loss) before income tax	375	314	1,014	908
Income tax (expense) benefit	(103)	(93)	(298)	(271)
Net income (loss)	$ 272	$ 221	$ 716	$ 637
Basic earnings (loss) per share	$ 1.01	$ 0.82	$ 2.66	$ 2.37
Diluted earnings (loss) per share	$ 1.01	$ 0.82	$ 2.65	$ 2.36
Dividends per share	$ 0.20	$ 0.15	$ 0.60	$ 0.45
Weighted Average Outstanding Common Stock and Common Stock Equivalents
Basic	269.7	269.4	269.6	269.4
Diluted	270.2	269.8	270.1	269.8