Consolidated Balance Sheet (Unaudited at March 31, 2013) (USD $) In Millions, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012	Mar. 31, 2012	Dec. 31, 2011
Assets
Fixed maturities, available for sale, at fair value (amortized cost $60,578 and $60,829)	$ 64,699	$ 65,393
Equity securities, available for sale, at fair value (cost $446 and $462)	694	645
Real estate investments	879	883
Short-term securities	3,368	3,483
Other investments	3,441	3,434
Total investments	73,081	73,838
Cash	243	330	258	214
Investment income accrued	686	752
Premiums receivable	6,021	5,872
Reinsurance recoverables	10,249	10,712
Ceded unearned premiums	976	856
Deferred acquisition costs	1,795	1,792
Contractholder receivables	4,824	4,806
Goodwill	3,365	3,365
Other intangible assets	370	381
Other assets	2,287	2,234
Total assets	103,897	104,938
Liabilities
Claims and claim adjustment expense reserves	50,018	50,922
Unearned premium reserves	11,406	11,241
Contractholder payables	4,824	4,806
Payables for reinsurance premiums	459	346
Deferred taxes	352	338
Debt	5,851	6,350
Other liabilities	5,391	5,530
Total liabilities	78,301	79,533
Shareholders' equity
Common stock (1,750.0 shares authorized; 376.4 and 377.4 shares issued and outstanding)	21,300	21,161	20,851	20,732
Retained earnings	22,072	21,352	20,223	19,579
Accumulated other comprehensive income	1,926	2,236	2,039	2,005
Treasury stock, at cost (376.7 and 372.3 shares)	(19,702)	(19,344)	(18,241)	(17,839)
Total shareholders' equity	25,596	25,405	24,872
Total liabilities and shareholders' equity	$ 103,897	$ 104,938