Consolidated Balance Sheet (Unaudited) (USD $) In Millions, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Assets:
Cash and cash equivalents	$ 1,529	$ 1,705
Investments:
Fixed maturities, available for sale at fair value (amortized cost - $22,755 and $22,083)	24,775	24,118
Fixed maturities, trading at fair value	307	321
Equity securities, at fair value (cost - $837 and $778)	1,065	939
Mortgage loans	584	607
Policy loans	224	228
Real estate and other investments	600	531
Total cash and investments	29,084	28,449
Recoverables from reinsurers	3,083	3,750
Prepaid reinsurance premiums	466	471
Agents' balances and premiums receivable	649	636
Deferred policy acquisition costs	565	550
Assets of managed investment entities	3,285	3,225
Other receivables	384	539
Variable annuity assets (separate accounts)	614	580
Other assets	824	786
Goodwill	185	185
Total assets	39,139	39,171
Liabilities and Equity:
Unpaid losses and loss adjustment expenses	6,238	6,845
Unearned premiums	1,697	1,651
Annuity benefits accumulated	18,075	17,609
Life, accident and health reserves	2,021	2,059
Payable to reinsurers	250	475
Liabilities of managed investment entities	2,880	2,892
Long-term debt	950	953
Variable annuity liabilities (separate accounts)	614	580
Other liabilities	1,506	1,359
Total liabilities	34,231	34,423
Shareholders' equity:
Common Stock, no par value - 200,000,000 shares authorized - 89,883,222 and 88,979,303 shares outstanding	90	89
Capital surplus	1,090	1,063
Retained earnings:
Appropriated - managed investment entities	64	75
Unappropriated	2,620	2,520
Accumulated other comprehensive income, net of tax	869	831
Total shareholders' equity	4,733	4,578
Noncontrolling interests	175	170
Total equity	4,908	4,748
Total liabilities and equity	$ 39,139	$ 39,171