Consolidated Statements of Cash Flows (USD $) In Millions, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Cash Flows from Operating Activities
Net Income	$ 2,100us-gaap_NetIncomeLoss	$ 2,345us-gaap_NetIncomeLoss	$ 1,545us-gaap_NetIncomeLoss
Adjustments to Reconcile Net Income to Net Cash Provided by Operating Activities
Increase (Decrease) in Unpaid Losses and Loss Expenses, Net	(45)	(582)	691
Increase in Unearned Premiums, Net	264	158	32
Amortization of Premiums and Discounts on Fixed Maturities	196	183	163
Depreciation	54us-gaap_Depreciation	55us-gaap_Depreciation	54us-gaap_Depreciation
Realized Investment Gains, Net	(369)us-gaap_GainLossOnInvestments	(402)us-gaap_GainLossOnInvestments	(193)us-gaap_GainLossOnInvestments
Other, Net	(47)	(26)	7
NET CASH PROVIDED BY OPERATING ACTIVITIES	2,153	1,731	2,299
Cash Flows from Investing Activities
Proceeds from Fixed Maturities - Sales	4,229	2,449	2,271
Proceeds from Fixed Maturities - Maturities, Calls and Redemptions	4,231	4,909	4,290
Proceeds from Sales of Equity Securities	213	545	160
Purchases of Fixed Maturities	(9,987)	(8,275)	(7,247)
Purchases of Equity Securities	(110)	(113)	(112)
Investments in Other Invested Assets, Net	315	498	293
Decrease (Increase) in Short Term Investments, Net	780	383	(629)
Change in Receivable or Payable from Security Transactions not Settled, Net	222	(86)	45
Purchases of Property and Equipment, Net	(49)	(52)	(43)
Other, Net		(6)
NET CASH PROVIDED BY (USED IN) INVESTING ACTIVITIES	(156)	252	(972)
Cash Flows from Financing Activities
Repayment of Long Term Debt		(275)us-gaap_RepaymentsOfLongTermDebt
Decrease in Funds Held under Deposit Contracts	(2)	(6)	(12)
Proceeds from Issuance of Common Stock Under Stock-Based Employee Compensation Plans	22us-gaap_ProceedsFromStockPlans	38us-gaap_ProceedsFromStockPlans	74us-gaap_ProceedsFromStockPlans
Repurchase of Shares	(1,547)	(1,288)	(959)
Dividends Paid to Shareholders	(475)us-gaap_PaymentsOfDividendsCommonStock	(450)us-gaap_PaymentsOfDividendsCommonStock	(438)us-gaap_PaymentsOfDividendsCommonStock
NET CASH USED IN FINANCING ACTIVITIES	(2,002)	(1,981)	(1,335)
Net Increase (Decrease) in Cash	(5)us-gaap_CashPeriodIncreaseDecrease	2us-gaap_CashPeriodIncreaseDecrease	(8)us-gaap_CashPeriodIncreaseDecrease
Cash at Beginning of Year	52us-gaap_Cash	50us-gaap_Cash	58us-gaap_Cash
CASH AT END OF YEAR	$ 47us-gaap_Cash	$ 52us-gaap_Cash	$ 50us-gaap_Cash

Change in net receivable or payable from security transactions not settled.

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The sum of the periodic adjustments of the differences between securities' face values and purchase prices that are charged against earnings. This is called accretion if the security was purchased at a discount and amortization if it was purchased at premium. As a noncash item, this element is an adjustment to net income when calculating cash provided by or used in operations using the indirect method.

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Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Excludes cash and cash equivalents within disposal group and discontinued operation.

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Amount of increase (decrease) in cash. Cash is the amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Includes effect from exchange rate changes.

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This item represents the net total realized and unrealized gain (loss) included in earnings for the period as a result of selling or holding marketable securities categorized as trading, available-for-sale, or held-to-maturity, including the unrealized holding gain (loss) of held-to-maturity securities transferred to the trading security category and the cumulative unrealized gain (loss) which was included in other comprehensive income (a separate component of shareholders' equity) for available-for-sale securities transferred to trading securities during the period. Additionally, this item would include any gains (losses) realized during the period from the sale of investments accounted for under the cost method of accounting and losses recognized for other than temporary impairments (OTTI) of the subject investments.

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The change in funds held under reinsurance agreements or treaty (contract between the reinsurer and the ceding entity stipulating the manner in which insurance written on various risks is to be shared).

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Net cash outflow or inflow from limited partnership investments held by the entity for investment purposes.

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The net cash outflow or inflow from other investing activities. This element is used when there is not a more specific and appropriate element in the taxonomy.

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