CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Revenues
Property-liability insurance premiums	$ 6,770	$ 6,630
Life and annuity premiums and contract charges	579	553
Net investment income	983	1,011
Realized capital gains and losses:
Total other-than-temporary impairment losses	(27)	(87)
Portion of loss recognized in other comprehensive income	(10)	4
Net other-than-temporary impairment losses recognized in earnings	(37)	(83)
Sales and other realized capital gains and losses	168	251
Total realized capital gains and losses	131	168
Total revenues	8,463	8,362
Costs and expenses
Property-liability insurance claims and claims expense	4,460	4,339
Life and annuity contract benefits	458	439
Interest credited to contractholder funds	345	378
Amortization of deferred policy acquisition costs	946	979
Operating costs and expenses	1,102	1,017
Restructuring and related charges	26	6
Interest expense	98	95
Total costs and expenses	7,435	7,253
Gain on disposition of operations	2	3
Income from operations before income tax expense	1,030	1,112
Income tax expense	321	346
Net income	$ 709	$ 766
Earnings per share:
Net income per share - Basic (in dollars per share)	$ 1.49	$ 1.54
Weighted average shares - Basic (in shares)	475.4	498.7
Net income per share - Diluted (in dollars per share)	$ 1.47	$ 1.53
Weighted average shares - Diluted (in shares)	480.8	501.5
Cash dividends declared per share (in dollars per share)	$ 0.25	$ 0.22