CONSOLIDATED STATEMENT OF CASH FLOWS (USD $) In Millions	6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010
Cash Flows from Operating Activities
Net Income	$ 928	$ 982
Adjustments to Reconcile Net Income to Net Cash Provided by Operating Activities
Increase in Unpaid Losses and Loss Expenses, Net	402	272
Increase in Unearned Premiums, Net	147	70
Increase in Premiums Receivable	(129)	(51)
Change in Income Tax Payable or Recoverable	(174)	19
Amortization of Premiums and Discounts on Fixed Maturities	90	89
Depreciation	29	31
Realized Investment Gains, Net	(229)	(217)
Other, Net	(216)	(196)
Net Cash Provided by Operating Activities	848	999
Cash Flows from Investing Activities
Proceeds from Fixed Maturities - Sales	832	1,593
Proceeds from Fixed Maturities - Maturities, Calls and Redemptions	1,445	1,215
Proceeds from Sales of Equity Securities	66	42
Purchases of Fixed Maturities	(2,644)	(2,457)
Purchases of Equity Securities	(61)	(52)
Investments in Other Invested Assets, Net	128	1
Decrease (Increase) in Short Term Investments, Net	221	(275)
Increase in Net Payable from Security Transactions Not Settled	200	118
Purchases of Property and Equipment, Net	(19)	(25)
Net Cash Provided by Investing Activities	168	160
Cash Flows from Financing Activities
Increase in Funds Held Under Deposit Contracts	11	24
Proceeds from Issuance of Common Stock Under Stock-Based Employee Compensation Plans	56	31
Repurchase of Shares	(855)	(976)
Dividends Paid to Shareholders	(227)	(239)
Net Cash Used in Financing Activities	(1,015)	(1,160)
Net Increase (Decrease) in Cash	1	(1)
Cash at Beginning of Year	70	51
Cash at End of Period	$ 71	$ 50