Consolidated Statement of Cash Flows (Unaudited) (USD $) In Millions	6 Months Ended
Jun. 30, 2011	Jun. 30, 2010
Cash flows from operating activities:
Net income (loss)	$ 866	$ 1,432
Adjustments to reconcile net income to net cash flows from operating activities
Net realized (gains) losses	118	(177)
Amortization of premiums/discounts on fixed maturities	63	61
Deferred income taxes	47	(48)
Unpaid losses and loss expenses (cash flow)	1,001	(452)
Unearned premiums (cash flow)	478	818
Future policy benefits (cash flow)	37	40
Insurance and reinsurance balances payable (cash flow)	449	(16)
Accounts payable, accrued expenses, and other liabilities (cash flow)	3	33
Income taxes payable (cash flow)	(91)	60
Insurance and reinsurance balances receivable (cash flow)	(578)	(316)
Reinsurance recoverable on losses and loss expenses (cash flow)	(296)	346
Reinsurance recoverable on policy benefits (cash flow)	29	11
Deferred policy acquisition costs (cash flow)	(149)	(167)
Prepaid reinsurance premiums (cash flow)	(156)	(411)
Other cash flows from operating activities	242	477
Net cash flows from operating activities	2,063	1,691
Cash flows used for investing activities:
Purchases of fixed maturities available for sale	(13,041)	(16,623)
Purchases of to be announced mortgage-backed securities	(642)	(720)
Purchases of fixed maturities held to maturity	(234)	(324)
Purchases of equity securities	(170)	(38)
Sales of fixed maturities available for sale	9,346	12,866
Sales of to be announced mortgage-backed securities	639	684
Sales of equity securities	347	311
Maturities and redemptions of fixed maturities available for sale	1,758	1,776
Maturities and redemptions of fixed maturities held to maturity	656	570
Net derivative instruments settlements	(46)	131
Acquisition of subsidiaries (net of cash acquired of $95 in 2011)	(380)
Other cash flows from investing activities	(132)	(100)
Net cash flows from (used for) investing activities	(1,899)	(1,467)
Cash flows (used for) from financing activities:
Dividends paid on Common Shares	(223)	(210)
Common Shares repurchased (cash flow)	(68)
Proceeds from issuance of short term debt	3,311	175
Repayment of short-term debt	(3,211)	(175)
Proceeds from share-based compensation plans	76	19
Net cash flows (used for) from financing activities	(115)	(191)
Effect of foreign currency rate changes on cash and cash equivalents:
Effect of foreign currency rate changes on cash and cash equivalents	12	(34)
Cash:
Net (decrease) increase in cash	61	(1)
Cash - beginning of period	772	669
Cash - end of period	833	668
Supplement cash flow disclosures
Taxes paid (cash flow)	265	256
Interest paid (cash flow)	$ 112	$ 101

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The component of interest expense representing the noncash expenses charged against earnings in the period to allocate debt discount and premium, and the costs to issue debt and obtain financing over the related debt instruments.

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The amount of cash paid during the current period to foreign, federal, state, and local authorities as taxes on income, net of any cash received during the current period as refunds for the overpayment of taxes.

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The change in the future policy benefit reserve balance on the balance sheet.

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The net change during the reporting period in the reserve account established to account for expected but unspecified losses.

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For entities with classified balance sheets, the net change during the reporting period in the value of other assets or liabilities used in operating activities, that are not otherwise defined in the taxonomy. For entities with unclassified balance sheets, the net change during the reporting period in the value of all other assets or liabilities used in operating activities.

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The change, in prepaid reinsurance premiums recorded on the balance sheet, is needed to adjust net income to arrive at net cash flows provided by (used in) operations.

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Change during the period in the unearned portion of premiums written, excluding the portion amortized into income. Premiums written are initially booked as unearned premiums and are recognized as revenue over the known or estimated life of the policy.

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The amount of cash paid during the current period for interest owed on money borrowed, net of interest capitalized.

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The net cash inflow (outflow) from financing activity for the period.

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The net cash inflow (outflow) from investing activity.

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The net cash from (used in) all of the entity's operating activities, including those of discontinued operations, of the reporting entity. Operating activities generally involve producing and delivering goods and providing services. Operating activity cash flows include transactions, adjustments, and changes in value that are not defined as investing or financing activities.

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The portion of consolidated profit or loss for the period, net of income taxes, which is attributable to the parent. If the entity does not present consolidated financial statements, the amount of profit or loss for the period, net of income taxes.

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The net cash outflow (inflow) associated with derivative instruments, such as swaps, forwards, options, and so forth, excluding those designated as hedges.

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The net cash outflow (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 to acquire a debt financial instrument for which the entity has the ability and intent to hold until maturity.

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

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The cash inflow from a borrowing having initial term of repayment within one year or the normal operating cycle, if longer.

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