Consolidated Statement of Income (Unaudited) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Revenues
Premiums	$ 5,666	$ 5,605	$ 16,718	$ 16,479
Net investment income	722	690	2,200	2,227
Fee income	92	79	233	227
Net realized investment gains (losses)	(2)	2	12	41
Other revenues	34	31	100	99
Total revenues	6,512	6,407	19,263	19,073
Claims and expenses
Claims and claim adjustment expenses	3,359	4,136	10,509	12,659
Amortization of deferred acquisition costs	986	982	2,933	2,900
General and administrative expenses	904	860	2,681	2,650
Interest expense	93	97	285	290
Total claims and expenses	5,342	6,075	16,408	18,499
Income before income taxes	1,170	332	2,855	574
Income tax expense (benefit)	306	(1)	686	(234)
Net income	864	333	2,169	808
Net income per share
Net income per share, basic	$ 2.23	$ 0.80	$ 5.55	$ 1.90
Net income per share, diluted	$ 2.21	$ 0.79	$ 5.50	$ 1.88
Weighted average number of common shares outstanding
Weighted average number of common shares outstanding, basic	384.0	415.0	388.0	420.4
Weighted average number of common shares outstanding, diluted	387.9	418.5	391.5	425.6
Other-than-temporary impairment losses:
Other-than-temporary impairment losses, total gains	17	9	28	16
Other-than-temporary impairment losses, non-credit component of impairments recognized in accumulated other comprehensive income	(20)	(21)	(39)	(36)
Other-than-temporary impairment losses	(3)	(12)	(11)	(20)
Other net realized investment gains	1	14	23	61
Net realized investment gains (losses)	$ (2)	$ 2	$ 12	$ 41