CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Revenues
Property-liability insurance premiums	$ 6,862	$ 6,666	$ 13,632	$ 13,296
Life and annuity premiums and contract charges	579	559	1,158	1,112
Net investment income	984	1,026	1,967	2,037
Realized capital gains and losses:
Total other-than-temporary impairment losses	(55)	(69)	(82)	(156)
Portion of loss recognized in other comprehensive income	(5)	19	(15)	23
Net other-than-temporary impairment losses recognized in earnings	(60)	(50)	(97)	(133)
Sales and other realized capital gains and losses	422	77	590	328
Total realized capital gains and losses	362	27	493	195
Total revenues	8,787	8,278	17,250	16,640
Costs and expenses
Property-liability insurance claims and claims expense	4,741	4,810	9,201	9,149
Life and annuity contract benefits	471	462	929	901
Interest credited to contractholder funds	311	366	656	744
Amortization of deferred policy acquisition costs	961	942	1,907	1,921
Operating costs and expenses	1,090	996	2,192	2,013
Restructuring and related charges	20	10	46	16
Loss on extinguishment of debt	480		480
Interest expense	99	93	197	188
Total costs and expenses	8,173	7,679	15,608	14,932
Gain on disposition of operations		3	2	6
Income from operations before income tax expense	614	602	1,644	1,714
Income tax expense	180	179	501	525
Net income	434	423	1,143	1,189
Preferred stock dividends
Net income available to common shareholders	$ 434	$ 423	$ 1,143	$ 1,189
Earnings per common share:
Net income available to common shareholders per common share - Basic (in dollars per share)	$ 0.93	$ 0.86	$ 2.42	$ 2.40
Weighted average common shares - Basic (in shares)	468.3	490.6	471.9	494.9
Net income available to common shareholders per common share - Diluted (in dollars per share)	$ 0.92	$ 0.86	$ 2.39	$ 2.39
Weighted average common shares - Diluted (in shares)	473.8	493.8	477.3	497.9
Cash dividends declared per common share (in dollars per share)	$ 0.25	$ 0.22	$ 0.50	$ 0.44