Consolidated Statements of Cash Flows (USD $) In Millions, unless otherwise specified	6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013
Cash Flows from Operating Activities
Net Income	$ 948	$ 1,235
Adjustments to Reconcile Net Income to Net Cash Provided by Operating Activities
Increase (Decrease) in Unpaid Losses and Loss Expenses, Net	87	(299)
Increase in Unearned Premiums, Net	192	158
Increase in Premiums Receivable	(136)	(130)
Amortization of Premiums and Discounts on Fixed Maturities	93	91
Depreciation	27	28
Realized Investment Gains, Net	(241)	(317)
Other, Net	(192)	(202)
Net Cash Provided by Operating Activities	778	564
Cash Flows from Investing Activities
Proceeds from Fixed Maturities - Sales	2,377	1,138
Proceeds from Fixed Maturities - Maturities, Calls and Redemptions	2,067	2,353
Proceeds from Sales of Equity Securities	136	273
Purchases of Fixed Maturities	(4,884)	(4,053)
Purchases of Equity Securities	(97)	(92)
Investments in Other Invested Assets, Net	112	280
Decrease in Short Term Investments, Net	259	514
Change in Receivable or Payable from Security Transactions Not Settled, Net	278	165
Purchases of Property and Equipment, Net	(26)	(25)
Other, Net	(3)
Net Cash Provided by Investing Activities	219	553
Cash Flows from Financing Activities
Repayment of Long Term Debt		(275)
Decrease in Funds Held Under Deposit Contracts	(1)	(4)
Proceeds from Issuance of Common Stock Under Stock-Based Employee Compensation Plans	15	36
Repurchase of Shares	(774)	(634)
Dividends Paid to Shareholders	(234)	(223)
Net Cash Used in Financing Activities	(994)	(1,100)
Net Increase in Cash	3	17
Cash at Beginning of Year	52	50
Cash at End of Period	$ 55	$ 67