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	$ 2,850us-gaap_NetIncomeLoss	$ 2,280us-gaap_NetIncomeLoss	$ 2,306us-gaap_NetIncomeLoss
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation, amortization and other non-cash items	366	368	388
Realized capital gains and losses	(694)us-gaap_RealizedInvestmentGainsLosses	(594)us-gaap_RealizedInvestmentGainsLosses	(327)us-gaap_RealizedInvestmentGainsLosses
Loss on extinguishment of debt	1	491
Loss (gain) on disposition of operations	74	688	(18)
Interest credited to contractholder funds	919	1,278	1,316
Changes in:
Policy benefits and other insurance reserves	541	(55)	214
Unearned premiums	766	602	306
Deferred policy acquisition costs	(220)	(268)	(18)
Premium installment receivables, net	(257)	(205)	(125)
Reinsurance recoverables, net	(1,068)	(729)	(1,560)
Income taxes	205	573	698
Other operating assets and liabilities	(247)	(187)	(126)
Net cash provided by operating activities	3,236	4,242	3,054
Proceeds from sales
Fixed income securities	34,609	21,243	18,872
Equity securities	6,755	3,173	1,495
Limited partnership interests	1,473	1,045	1,398
Mortgage loans	10	24	14
Other investments	406	151	148
Investment collections
Fixed income securities	3,736	5,908	5,417
Mortgage loans	1,106	1,020	1,064
Other investments	191	275	128
Investment purchases
Fixed income securities	(38,759)	(24,087)	(22,658)
Equity securities	(5,443)	(3,677)	(671)
Limited partnership interests	(1,398)	(1,312)	(1,524)
Mortgage loans	(501)all_PaymentsToPurchaseMortgageLoans	(538)all_PaymentsToPurchaseMortgageLoans	(525)all_PaymentsToPurchaseMortgageLoans
Other investments	(972)	(1,084)	(665)
Change in short-term investments, net	272	(427)	(698)
Change in other investments, net	46	97	58
Purchases of property and equipment, net	(288)	(207)	(285)
Disposition (acquisition) of operations	378	(24)	13
Net cash provided by investing activities	1,621	1,580	1,581
Cash flows from financing activities
Proceeds from issuance of long-term debt		2,271	493
Repayment of long-term debt	(1,006)us-gaap_RepaymentsOfLongTermDebt	(2,627)us-gaap_RepaymentsOfLongTermDebt	(352)us-gaap_RepaymentsOfLongTermDebt
Proceeds from issuance of preferred stock	965	781
Contractholder fund deposits	1,184us-gaap_AdditionsToContractHoldersFunds	2,174us-gaap_AdditionsToContractHoldersFunds	2,158us-gaap_AdditionsToContractHoldersFunds
Contractholder fund withdrawals	(3,446)	(6,556)	(5,519)
Dividends paid on common stock	(477)us-gaap_PaymentsOfDividendsCommonStock	(352)us-gaap_PaymentsOfDividendsCommonStock	(534)us-gaap_PaymentsOfDividendsCommonStock
Dividends paid on preferred stock	(87)	(6)
Treasury stock purchases	(2,301)	(1,834)	(913)
Shares reissued under equity incentive plans, net	266	170	85
Excess tax benefits on share-based payment arrangements	41	38	10
Other	(14)	(12)	(33)
Net cash used in financing activities	(4,875)	(5,953)	(4,605)
Net (decrease) increase in cash	(18)us-gaap_CashPeriodIncreaseDecrease	(131)us-gaap_CashPeriodIncreaseDecrease	30us-gaap_CashPeriodIncreaseDecrease
Cash at beginning of year	675us-gaap_Cash	806us-gaap_Cash	776us-gaap_Cash
Cash at end of year	$ 657us-gaap_Cash	$ 675us-gaap_Cash	$ 806us-gaap_Cash

The cash outflow used to purchase loans that are secured with real estate mortgage.

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The cash inflow from collections of repayments from borrowers on loans that are secured with real estate mortgages.

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The cash inflow from a segregated fund account during the period.

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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 aggregate net amount of depreciation, amortization, and accretion recognized during an accounting period. As a noncash item, the net amount is added back to net income when calculating cash provided by or used in operations using the indirect method.

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The gain (loss) resulting from the sale of a disposal group that is not a discontinued operation. It is included in income from continuing operations before income taxes in the income statement.

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Amount of cash inflow from realized tax benefit related to deductible compensation cost reported on the entity's tax return for equity instruments in excess of the compensation cost for those instruments recognized for financial reporting purposes.

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Difference between the fair value of payments made and the carrying amount of debt which is extinguished prior to maturity.

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The increase (decrease) during the reporting period in the balance sheet value of capitalized sales costs that are associated with acquiring a new insurance customers.

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The increase (decrease) during the reporting period in the amounts payable to taxing authorities for taxes that are based on the reporting entity's earnings, net of amounts receivable from taxing authorities for refunds of overpayments or recoveries of income taxes.

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The increase (decrease) in insurance liability balances during the period.

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The increase (decrease) during the reporting period in other assets used in operating activities less other operating liabilities used in operating activities not separately disclosed in the statement of cash flows. May include changes in other current assets and liabilities, other noncurrent assets and liabilities, or a combination of other current and noncurrent assets and liabilities.

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The change in the premium receivable balance on the balance sheet.

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The increase (decrease) during the reporting period in the amount of benefits the ceding insurer expects to recover on insurance policies ceded to other insurance entities as of the balance sheet date for all guaranteed benefit types.

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Amount of increase (decrease) unearned premiums written. Excludes portion of unearned premiums amortized into income.

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Interest allocated to policyholders holding contracts under which the insurer must provide a guaranteed yield.

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Amount of cash inflow (outflow) from financing activities, including 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) from investing activities, including 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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Amount of cash inflow (outflow) from operating activities, including discontinued operations. Operating activity cash flows include transactions, adjustments, and changes in value not defined as investing or financing activities.

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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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The net cash outflow or inflow associated with the acquisition or sale of a business segment during the period.

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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 cash outflow to reacquire common stock during the period.

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The cash outflow to acquire debt securities classified as available-for-sale securities, because they are not classified as either held-to-maturity securities or trading securities.

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The cash outflow associated with the acquisition of or advances to an entity that is related to it but not strictly controlled (for example, an unconsolidated subsidiary, affiliate, and joint venture or equity method investment) or the acquisition of an additional interest in a subsidiary (controlled entity).

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The cash outflow associated with other investments held by the entity for investment purposes not otherwise defined in the taxonomy.

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The cash outflow associated with the acquisition of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale; includes cash outflows to pay for construction of self-constructed assets.

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The cash inflow associated with the deconsolidation of a previously consolidated subsidiary or sale of an entity that is related to it but not strictly controlled.

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The cash inflow from a debt initially having maturity due after one year or beyond the operating cycle, if longer.

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Proceeds from issuance of capital stock which provides for a specific dividend that is paid to the shareholders before any dividends to common stockholders and which takes precedence over common stockholders in the event of liquidation.

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The total cash inflow associated with the amount received from holders to acquire the entity's shares under incentive and share awards, including stock option exercises. This item inherently excludes any excess tax benefit, which the entity may have realized and reported separately.

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The cash inflow associated with maturities (principal being due), prepayments and calls (requests of early payments) on securities not classified as either held-to-maturity securities or trading securities which are classified as available-for-sale securities.

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The cash inflow associated with the maturity (principal being due), prepayment and call (request of early payment) of other investments not otherwise defined in the taxonomy.

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

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The cash inflow associated with the sale of debt securities classified as available-for-sale securities.

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The cash inflow associated with the sale of equity securities classified as available-for-sale securities.

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The cash inflow from sales of loans that are secured with real estate mortgages and are held with the intention to resell in the near future.

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The cash inflow associated with the sale of other investments not otherwise defined in the taxonomy.

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The net realized gains or losses on investments during the period, not including gains or losses on securities separately or otherwise categorized as trading, available-for-sale, or held-to-maturity.

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The cash outflow for debt initially having maturity due after one year or beyond the normal operating cycle, if longer.

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The cash outflow for a segregated fund account during the period.

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