Consolidated Statements of Cash Flows (USD $) In Millions, unless otherwise specified	3 Months Ended
Mar. 31, 2015	Mar. 31, 2014
Cash Flows from Operating Activities
Net Income	$ 375us-gaap_NetIncomeLoss	$ 449us-gaap_NetIncomeLoss
Adjustments to Reconcile Net Income to Net Cash Provided by Operating Activities
Increase in Unpaid Losses and Loss Expenses, Net	260	51
Increase in Unearned Premiums, Net	1	33
Amortization of Premiums and Discounts on Fixed Maturities	54	46
Depreciation	12us-gaap_Depreciation	14us-gaap_Depreciation
Realized Investment Gains, Net	(11)us-gaap_GainLossOnInvestments	(116)us-gaap_GainLossOnInvestments
Other, Net	(161)	(105)
Net Cash Provided by Operating Activities	530	372
Cash Flows from Investing Activities
Proceeds from Fixed Maturities - Sales	1,436	379
Proceeds from Fixed Maturities - Maturities, Calls and Redemptions	820	957
Proceeds from Sales of Equity Securities	29	101
Purchases of Fixed Maturities	(2,421)	(1,810)
Purchases of Equity Securities	(24)	(89)
Investments in Other Invested Assets, Net	17	98
Decrease in Short Term Investments, Net	82	417
Change in Receivable or Payable from Security Transactions Not Settled, Net	5	105
Purchases of Property and Equipment, Net	(18)	(10)
Other, Net		(3)
Net Cash Provided by (Used in) Investing Activities	(74)	145
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	5us-gaap_ProceedsFromStockPlans	14us-gaap_ProceedsFromStockPlans
Repurchase of Shares	(338)	(415)
Dividends Paid to Shareholders	(117)us-gaap_PaymentsOfDividendsCommonStock	(110)us-gaap_PaymentsOfDividendsCommonStock
Net Cash Used in Financing Activities	(451)	(512)
Net Increase in Cash	5us-gaap_CashPeriodIncreaseDecrease	5us-gaap_CashPeriodIncreaseDecrease
Cash at Beginning of Year	47us-gaap_Cash	52us-gaap_Cash
Cash at End of Period	$ 52us-gaap_Cash	$ 57us-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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The amount of expense recognized in the current period that reflects the allocation of the cost of tangible assets over the assets' useful lives. Includes production and non-production related depreciation.

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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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The increase (decrease) in property and casualty insurance liabilities balances during the period.

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Amount of cash inflow (outflow) of financing activities, excluding discontinued operations. Financing activity cash flows include obtaining resources from owners and providing them with a return on, and a return of, their investment; borrowing money and repaying amounts borrowed, or settling the obligation; and obtaining and paying for other resources obtained from creditors on long-term credit.

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Amount of cash inflow (outflow) of investing activities, excluding discontinued operations. Investing activity cash flows include making and collecting loans and acquiring and disposing of debt or equity instruments and property, plant, and equipment and other productive assets.

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The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

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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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The net amount paid (received) by the reporting entity through acquisition or sale and maturities of short-term investments with an original maturity that is three months or less which qualify for treatment as an investing activity based on management's intention and intended by management to be liquidated, if necessary, within the current operating cycle. Includes cash flows from securities classified as trading securities that were acquired for reasons other than sale in the short-term.

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The cash outflow to reacquire common stock during the period.

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Amount of cash outflow in the form of ordinary dividends to common shareholders of the parent entity.

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