Consolidated Statement of Cash Flows (Unaudited) (USD $) In Millions, unless otherwise specified	9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011
Cash flows from operating activities
Net income	$ 2,169	$ 808
Adjustments to reconcile net income to net cash provided by operating activities:
Net realized investment gains	(12)	(41)
Depreciation and amortization	618	599
Deferred federal income tax expense	221	159
Amortization of deferred acquisition costs	2,933	2,900
Equity in income from other investments	(271)	(279)
Change in premiums receivable	(307)	(439)
Change in reinsurance recoverables	926	246
Change in deferred acquisition costs	(3,005)	(2,988)
Change in claims and claim adjustment expense reserves	(1,196)	740
Change in unearned premium reserves	506	612
Other operating activities	184	(499)
Net cash provided by operating activities	2,766	1,818
Cash flows from investing activities
Proceeds from maturities of fixed maturities	5,855	5,241
Proceeds from sales of investments, fixed maturities	724	842
Proceeds from sales of investments, equity securities	31	51
Proceeds from sales of investments, real estate investments	3	1
Proceeds from sales of investments, other investments	516	482
Purchases of investments, fixed maturities	(7,677)	(6,224)
Purchases of investments, equity securities	(39)	(118)
Purchases of investments, real estate investments	(62)	(41)
Purchases of investments, other investments	(292)	(758)
Net sales (purchases) of short-term securities	(41)	813
Securities transactions in course of settlement	53	196
Other investing activities	(229)	(248)
Net cash provided by (used in) investing activities	(1,158)	237
Cash flows from financing activities
Payment of debt	(258)	(8)
Dividends paid to shareholders	(519)	(500)
Issuance of common stock - employee share options	247	270
Treasury stock acquired - share repurchase authorization	(1,056)	(1,755)
Treasury stock acquired - net employee share-based compensation	(52)	(46)
Excess tax benefits from share-based payment arrangements	32	17
Net cash used in financing activities	(1,606)	(2,022)
Effect of exchange rate changes on cash	4	(2)
Net increase in cash	6	31
Cash at beginning of year	214	200
Cash at end of period	220	231
Supplemental disclosure of cash flow information
Income taxes paid	310	277
Interest paid	$ 226	$ 226