Consolidated Statement of Income (Unaudited) (USD $) In Millions, except Per Share data	3 Months Ended		9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010
Revenues
Premiums	$ 5,605	$ 5,422	$ 16,479	$ 15,992
Net investment income	690	735	2,227	2,250
Fee income	79	64	227	219
Net realized investment gains	2	226	41	220
Other revenues	31	35	99	99
Total revenues	6,407	6,482	19,073	18,780
Claims and expenses
Claims and claim adjustment expenses	4,136	3,213	12,659	10,020
Amortization of deferred acquisition costs	982	966	2,900	2,845
General and administrative expenses	860	837	2,650	2,516
Interest expense	97	95	290	290
Total claims and expenses	6,075	5,111	18,499	15,671
Income before income taxes	332	1,371	574	3,109
Income tax expense (benefit)	(1)	366	(234)	787
Net income	333	1,005	808	2,322
Net income per share
Net income per share, basic	$ 0.80	$ 2.14	$ 1.90	$ 4.73
Net income per share, diluted	$ 0.79	$ 2.11	$ 1.88	$ 4.68
Weighted average number of common shares outstanding
Weighted average number of common shares outstanding, basic	415.0	465.9	420.4	486.1
Weighted average number of common shares outstanding, diluted	418.5	472.0	425.6	492.3
Other-than-temporary impairment losses:
Other-than-temporary impairment losses, total gains	9	8	16	9
Other-than-temporary impairment losses, non-credit component of impairments recognized in accumulated other changes in equity from nonowner sources	(21)	(14)	(36)	(29)
Other-than-temporary impairment losses	(12)	(6)	(20)	(20)
Other net realized investment gains	14	232	61	240
Net realized investment gains	$ 2	$ 226	$ 41	$ 220