Consolidated Statements of Cash Flows - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014
Cash Flows from Operating Activities
Net Income	$ 869	$ 948
Adjustments to Reconcile Net Income to Net Cash Provided by Operating Activities
Increase in Unpaid Losses and Loss Expenses, Net	218	87
Increase in Unearned Premiums, Net	177	192
Amortization of Premiums and Discounts on Fixed Maturities	114	93
Depreciation	25	27
Realized Investment Gains, Net	(31)	(241)
Other, Net	(290)	(328)
Net Cash Provided by Operating Activities	1,082	778
Cash Flows from Investing Activities
Proceeds from Fixed Maturities - Sales	2,401	2,377
Proceeds from Fixed Maturities - Maturities, Calls and Redemptions	1,917	2,067
Proceeds from Sales of Equity Securities	28	136
Purchases of Fixed Maturities	(4,421)	(4,884)
Purchases of Equity Securities	(32)	(97)
Investments in Other Invested Assets, Net	16	112
Decrease (Increase) in Short Term Investments, Net	(113)	259
Change in Receivable or Payable from Security Transactions Not Settled, Net	31	278
Purchases of Property and Equipment, Net	(37)	(26)
Other, Net		(3)
Net Cash Provided by (Used in) Investing Activities	(210)	219
Cash Flows from Financing Activities
Decrease in Funds Held Under Deposit Contracts	(1)	(1)
Proceeds from Issuance of Common Stock Under Stock-Based Employee Compensation Plans	6	15
Repurchase of Shares	(624)	(774)
Dividends Paid to Shareholders	(250)	(234)
Net Cash Used in Financing Activities	(869)	(994)
Net Increase in Cash	3	3
Cash at Beginning of Year	47	52
Cash at End of Period	$ 50	$ 55