CONSOLIDATED STATEMENT OF CASH FLOWS (USD $) In Millions	9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010
Cash Flows from Operating Activities
Net Income	$ 1,226	$ 1,554
Adjustments to Reconcile Net Income to Net Cash Provided by Operating Activities
Increase in Unpaid Losses and Loss Expenses, Net	728	213
Increase in Unearned Premiums, Net	94	4
Decrease in Premiums Receivable	101	127
Change in Income Tax Payable or Recoverable	(193)	216
Amortization of Premiums and Discounts on Fixed Maturities	111	116
Depreciation	41	47
Realized Investment Gains, Net	(300)	(271)
Other, Net	(118)	(128)
Net Cash Provided by Operating Activities	1,690	1,878
Cash Flows from Investing Activities
Proceeds from Fixed Maturities - Sales	1,184	1,793
Proceeds from Fixed Maturities - Maturities, Calls and Redemptions	2,450	2,079
Proceeds from Sales of Equity Securities	103	93
Purchases of Fixed Maturities	(3,660)	(3,950)
Purchases of Equity Securities	(67)	(108)
Investments in Other Invested Assets, Net	198	66
Increase in Short Term Investments, Net	(378)	(109)
Increase in Net Payable from Security Transactions Not Settled	91	112
Purchases of Property and Equipment, Net	(30)	(38)
Other, Net	0	(1)
Net Cash Used in Investing Activities	(109)	(63)
Cash Flows from Financing Activities
Increase in Funds Held Under Deposit Contracts	8	23
Proceeds from Issuance of Common Stock Under Stock-Based Employee Compensation Plans	63	54
Repurchase of Shares	(1,327)	(1,509)
Dividends Paid to Shareholders	(340)	(357)
Net Cash Used in Financing Activities	(1,596)	(1,789)
Net Increase (Decrease) in Cash	(15)	26
Cash at Beginning of Year	70	51
Cash at End of Period	$ 55	$ 77