Consolidated Statement of Cash Flows (Unaudited) (USD $) In Millions	6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010
Cash flows from operating activities
Net income	$ 475	$ 1,317
Adjustments to reconcile net income to net cash provided by operating activities:
Net realized investment (gains) losses	(39)	6
Depreciation and amortization	405	411
Deferred federal income tax expense	137	51
Amortization of deferred acquisition costs	1,918	1,879
Equity in income from other investments	(231)	(116)
Change in premiums receivable	(542)	(382)
Change in reinsurance recoverables	225	528
Change in deferred acquisition costs	(1,973)	(1,930)
Change in claims and claim adjustment expense reserves	889	(692)
Change in unearned premium reserves	395	270
Other operating activities	(758)	(291)
Net cash provided by operating activities	901	1,051
Cash flows from investing activities
Proceeds from maturities of fixed maturities	3,234	2,478
Proceeds from sales of investments, fixed maturities	736	2,781
Proceeds from sales of investments, equity securities	47	27
Proceeds from sales of investments, real estate		10
Proceeds from sales of investments, other investments	285	189
Purchases of investments, fixed maturities	(3,547)	(3,940)
Purchases of investments, equity securities	(103)	(19)
Purchases of investments, real estate	(35)	(8)
Purchases of investments, other investments	(629)	(227)
Net sales of short-term securities	597	1,050
Securities transactions in course of settlement	213	2
Other investing activities	(143)	(145)
Net cash provided by investing activities	655	2,198
Cash flows from financing activities
Payment of debt	(8)	(250)
Dividends paid to shareholders	(329)	(343)
Issuance of common stock - employee share options	245	199
Treasury stock acquired - share repurchase authorization	(1,360)	(2,804)
Treasury stock acquired - net employee share-based compensation	(46)	(40)
Excess tax benefits from share-based payment arrangements, financing activities	11	5
Net cash used in financing activities	(1,487)	(3,233)
Effect of exchange rate changes on cash	4	(5)
Net increase in cash	73	11
Cash at beginning of year	200	255
Cash at end of period	273	266
Supplemental disclosure of cash flow information
Income taxes paid	291	309
Interest paid	$ 191	$ 200