Consolidated Statement of Cash Flows (Unaudited) (USD $) In Millions, unless otherwise specified	6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011
Cash flows from operating activities
Net income	$ 1,305	$ 475
Adjustments to reconcile net income to net cash provided by operating activities:
Net realized investment gains	(14)	(39)
Depreciation and amortization	412	405
Deferred federal income tax expense	125	137
Amortization of deferred acquisition costs	1,947	1,918
Equity in income from other investments	(228)	(231)
Change in premiums receivable	(468)	(542)
Change in reinsurance recoverables	752	225
Change in deferred acquisition costs	(2,000)	(1,973)
Change in claims and claim adjustment expense reserves	(599)	889
Change in unearned premium reserves	346	395
Other operating activities	(313)	(758)
Net cash provided by operating activities	1,265	901
Cash flows from investing activities
Proceeds from maturities of fixed maturities	4,167	3,234
Proceeds from sales of investments, fixed maturities	542	736
Proceeds from sales of investments, equity securities	22	47
Proceeds from sales of investments, real estate investments	3
Proceeds from sales of investments, other investments	386	285
Purchases of investments, fixed maturities	(5,200)	(3,547)
Purchases of investments, equity securities	(33)	(103)
Purchases of investments, real estate investments	(58)	(35)
Purchases of investments, other investments	(221)	(629)
Net sales of short-term securities	367	597
Securities transactions in course of settlement	77	213
Other investing activities	(133)	(143)
Net cash provided by (used in) investing activities	(81)	655
Cash flows from financing activities
Payment of debt	(258)	(8)
Dividends paid to shareholders	(341)	(329)
Issuance of common stock - employee share options	170	245
Treasury stock acquired - share repurchase authorization	(707)	(1,360)
Treasury stock acquired - net employee share-based compensation	(52)	(46)
Excess tax benefits from share-based payment arrangements	19	11
Net cash used in financing activities	(1,169)	(1,487)
Effect of exchange rate changes on cash	1	4
Net increase in cash	16	73
Cash at beginning of year	214	200
Cash at end of period	230	273
Supplemental disclosure of cash flow information
Income taxes paid	296	291
Interest paid	$ 191	$ 191