CONSOLIDATED STATEMENTS OF OPERATIONS (USD $) In Millions, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Revenues
Property-liability insurance premiums (net of reinsurance ceded of $1,090, $1,098 and $1,092)	$ 26,737	$ 25,942	$ 25,957
Life and annuity premiums and contract charges (net of reinsurance ceded of $674, $750 and $804)	2,241	2,238	2,168
Net investment income	4,010	3,971	4,102
Realized capital gains and losses:
Total other-than-temporary impairment losses	(239)	(563)	(937)
Portion of loss recognized in other comprehensive income	6	(33)	(64)
Net other-than-temporary impairment losses recognized in earnings	(233)	(596)	(1,001)
Sales and other realized capital gains and losses	560	1,099	174
Total realized capital gains and losses	327	503	(827)
Total revenues	33,315	32,654	31,400
Costs and expenses
Property-liability insurance claims and claims expense (net of reinsurance ceded of $2,051, $927 and $271)	18,484	20,161	18,951
Life and annuity contract benefits (net of reinsurance ceded of $665, $653 and $702)	1,818	1,761	1,815
Interest credited to contractholder funds (net of reinsurance ceded of $28, $27 and $32)	1,316	1,645	1,807
Amortization of deferred policy acquisition costs	3,884	3,971	3,807
Operating costs and expenses	4,118	3,739	3,542
Restructuring and related charges	34	44	30
Interest expense	373	367	367
Total costs and expenses	30,027	31,688	30,319
Gain (loss) on disposition of operations	18	(7)	19
Income from operations before income tax expense	3,306	959	1,100
Income tax expense	1,000	172	189
Net income	$ 2,306	$ 787	$ 911
Earnings per share:
Net income per share - Basic (in dollars per share)	$ 4.71	$ 1.51	$ 1.69
Weighted average shares - Basic (in shares)	489.4	520.7	540.3
Net income per share - Diluted (in dollars per share)	$ 4.68	$ 1.50	$ 1.68
Weighted average shares - Diluted (in shares)	493.0	523.1	542.5
Cash dividends declared per share (in dollars per share)	$ 0.88	$ 0.84	$ 0.80