Consolidated Statements of Cash Flows (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Cash Flows from Operating Activities
Net Income	$ 449	$ 656
Adjustments to Reconcile Net Income to Net Cash Provided by Operating Activities
Increase (Decrease) in Unpaid Losses and Loss Expenses, Net	51	(270)
Increase in Unearned Premiums, Net	33	53
Decrease in Premiums Receivable	84	4
Change in Income Tax Payable or Recoverable	80	168
Amortization of Premiums and Discounts on Fixed Maturities	46	44
Depreciation	14	14
Realized Investment Gains, Net	(116)	(138)
Other, Net	(269)	(232)
Net Cash Provided by Operating Activities	372	299
Cash Flows from Investing Activities
Proceeds from Fixed Maturities - Sales	379	450
Proceeds from Fixed Maturities - Maturities, Calls and Redemptions	957	943
Proceeds from Sales of Equity Securities	101	106
Purchases of Fixed Maturities	(1,810)	(1,909)
Purchases of Equity Securities	(89)	(36)
Investments in Other Invested Assets, Net	98	139
Decrease in Short Term Investments, Net	417	659
Change in Receivable or Payable from Security Transactions Not Settled, Net	105	(244)
Purchases of Property and Equipment, Net	(10)	(15)
Other, Net	(3)
Net Cash Provided by Investing Activities	145	93
Cash Flows from Financing Activities
Decrease in Funds Held Under Deposit Contracts	(1)	(4)
Proceeds from Issuance of Common Stock Under Stock-Based Employee Compensation Plans	14	34
Repurchase of Shares	(415)	(309)
Dividends Paid to Shareholders	(110)	(108)
Net Cash Used in Financing Activities	(512)	(387)
Net Increase in Cash	5	5
Cash at Beginning of Year	52	50
Cash at End of Period	$ 57	$ 55