Consolidated Statements of Cash Flows (USD $) In Millions, unless otherwise specified	9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013
Cash Flows from Operating Activities
Net Income	$ 1,542	$ 1,776
Adjustments to Reconcile Net Income to Net Cash Provided by Operating Activities
Increase (Decrease) in Unpaid Losses and Loss Expenses, Net	151	(303)
Increase in Unearned Premiums, Net	242	160
Change in Income Tax Payable or Recoverable	163	26
Amortization of Premiums and Discounts on Fixed Maturities	143	138
Depreciation	41	42
Realized Investment Gains, Net	(351)	(335)
Other, Net	(12)	(183)
Net Cash Provided by Operating Activities	1,919	1,321
Cash Flows from Investing Activities
Proceeds from Fixed Maturities - Sales	3,243	1,781
Proceeds from Fixed Maturities - Maturities, Calls and Redemptions	3,162	3,525
Proceeds from Sales of Equity Securities	199	399
Purchases of Fixed Maturities	(7,517)	(6,464)
Purchases of Equity Securities	(109)	(98)
Investments in Other Invested Assets, Net	189	394
Decrease in Short Term Investments, Net	56	629
Change in Receivable or Payable from Security Transactions Not Settled, Net	457	88
Purchases of Property and Equipment, Net	(44)	(38)
Net Cash Provided by (Used in) Investing Activities	(364)	216
Cash Flows from Financing Activities
Repayment of Long Term Debt		(275)
Decrease in Funds Held Under Deposit Contracts	(2)	(5)
Proceeds from Issuance of Common Stock Under Stock-Based Employee Compensation Plans	18	38
Repurchase of Shares	(1,210)	(962)
Dividends Paid to Shareholders	(356)	(337)
Net Cash Used in Financing Activities	(1,550)	(1,541)
Net Increase (Decrease) in Cash	5	(4)
Cash at Beginning of Year	52	50
Cash at End of Period	$ 57	$ 46