Consolidated Balance Sheet (USD $) In Millions, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009	Dec. 31, 2008
Assets
Fixed maturities, available for sale, at fair value (amortized cost $59,994 and $60,170)	$ 64,232	$ 62,820
Equity securities, available for sale, at fair value (cost $414 and $372)	559	519
Real estate investments	865	838
Short-term securities	3,594	5,616
Other investments	3,451	2,929
Total investments	72,701	72,722
Cash	214	200	255	350
Investment income accrued	768	791
Premiums receivable	5,730	5,497
Reinsurance recoverables	11,182	11,994
Ceded unearned premiums	828	813
Deferred acquisition costs	1,786	1,782	1,758
Deferred taxes	7	493
Contractholder receivables	5,186	5,343
Goodwill	3,365	3,365
Other intangible assets	433	502
Other assets	2,402	2,154
Total assets	104,602	105,656
Liabilities
Claims and claim adjustment expense reserves	51,419	51,606	53,602
Unearned premium reserves	11,102	10,921	10,861
Contractholder payables	5,186	5,343
Payables for reinsurance premiums	389	407
Debt	6,605	6,611
Other liabilities	5,424	5,293
Total liabilities	80,125	80,181
Shareholders' equity
Preferred Stock Savings Plan - convertible preferred stock (0.0 and 0.2 shares issued and outstanding)		68	79	89
Common stock (1,750.0 and 1,748.6 shares authorized; 392.8 and 434.6 shares issued and outstanding)	20,732	20,162	19,593	19,242
Retained earnings	19,579	18,847	16,315	13,314
Accumulated other changes in equity from nonowner sources	2,005	1,255	1,219	(900)
Treasury stock, at cost (349.0 and 296.6 shares)	(17,839)	(14,857)	(9,791)	(6,426)
Total shareholders' equity	24,477	25,475	27,415
Total liabilities and shareholders' equity	$ 104,602	$ 105,656