Consolidated Statements Of Operations and Comprehensive Income (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended
Mar. 31, 2015	Mar. 31, 2014
Revenues
Net premiums written	$ 4,076us-gaap_PremiumsWrittenNet	$ 4,185us-gaap_PremiumsWrittenNet
Increase in unearned premiums	(149)ace_ChangeInUnearnedPremiumNet	(215)ace_ChangeInUnearnedPremiumNet
Net premiums earned	3,927us-gaap_PremiumsEarnedNet	3,970us-gaap_PremiumsEarnedNet
Net investment income	551us-gaap_InvestmentIncomeNet	553us-gaap_InvestmentIncomeNet
Net realized gains (losses):
Other-than-temporary impairment (OTTI) losses gross	(13)	(12)
Portion of OTTI losses recognized in other comprehensive income (OCI)	0	1
Net OTTI losses recognized in income	(13)	(11)
Net realized gains (losses) excluding OTTI losses	(76)	(93)
Total net realized gains (losses) (includes $(3) and $6 reclassified from AOCI)	(89)ace_NetRealizedGainsLosses	(104)ace_NetRealizedGainsLosses
Total revenues	4,389us-gaap_Revenues	4,419us-gaap_Revenues
Expenses
Losses and loss expenses	2,122	2,161
Policy benefits	142	114
Policy acquisition costs	707	728
Administrative expenses	554us-gaap_GeneralAndAdministrativeExpense	535us-gaap_GeneralAndAdministrativeExpense
Interest expense	68us-gaap_InterestIncomeExpenseNet	71us-gaap_InterestIncomeExpenseNet
Other (income) expense	(5)us-gaap_OtherNonoperatingIncomeExpense	(17)us-gaap_OtherNonoperatingIncomeExpense
Total expenses	3,588us-gaap_BenefitsLossesAndExpenses	3,592us-gaap_BenefitsLossesAndExpenses
Income before income tax	801	827
Income tax expense (benefit) (includes $4 and $(3) on reclassified unrealized gains and losses)	120us-gaap_IncomeTaxExpenseBenefit	93us-gaap_IncomeTaxExpenseBenefit
Net income	681us-gaap_NetIncomeLoss	734us-gaap_NetIncomeLoss
Other comprehensive income (loss)
Unrealized appreciation	441	519
Reclassification adjustment for net realized (gains) losses included in net income	3	(6)
Unrealized appreciation (Depreciation) after reclassification adjustment	444	513
Change in:
Cumulative translation adjustment	(421)	(33)
Pension liability	13	(8)
Other comprehensive income, before income tax	36	472
Income tax expense related to OCI items	(75)us-gaap_OtherComprehensiveIncomeLossTax	(98)us-gaap_OtherComprehensiveIncomeLossTax
Other comprehensive income (loss)	(39)	374
Comprehensive income	642	1,108
Earnings per share
Basic earnings per share	$ 2.08us-gaap_EarningsPerShareBasic	$ 2.16us-gaap_EarningsPerShareBasic
Diluted earnings per share	$ 2.05us-gaap_EarningsPerShareDiluted	$ 2.14us-gaap_EarningsPerShareDiluted
Reclassification out of Accumulated Other Comprehensive Income [Member] \| Accumulated Net Unrealized Investment Gain (Loss) [Member]
Net realized gains (losses):
Total net realized gains (losses) (includes $(3) and $6 reclassified from AOCI)	(3)	6
Expenses
Income tax expense (benefit) (includes $4 and $(3) on reclassified unrealized gains and losses)	$ 4	$ (3)

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Amount before tax of reclassification adjustment from accumulated other comprehensive income for unrealized gain (loss) realized upon the sale of available-for-sale securities.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 50

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-Section 45

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-Topic 220

-SubTopic 10

-Section 45

-Paragraph 15

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Amount of tax expense (benefit) allocated to other comprehensive income (loss).

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-Name Regulation S-X (SX)

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Amount before tax and reclassification adjustments of unrealized holding gain (loss) on available-for-sale securities.

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The net amount of other income and expense amounts, the components of which are not separately disclosed on the income statement, resulting from ancillary business-related activities (that is, excluding major activities considered part of the normal operations of the business) also known as other nonoperating income (expense) recognized for the period. Such amounts may include: (a) dividends, (b) interest on securities, (c) net gains or losses on securities, (d) unusual costs, (e) gains or losses on foreign exchange transactions, and (f) miscellaneous other income and expense items.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

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Reference 2: http://www.xbrl.org/2003/role/presentationRef

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Amount before tax of other than temporary impairment (OTTI) loss on investments in available-for-sale and held-to-maturity debt securities, recognized in other comprehensive loss.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 220

-SubTopic 10

-Section 45

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The amount of other than temporary impairment (OTTI) losses on equity securities, OTTI related to credit losses on debt securities, and OTTI losses on debt securities when the entity intends to sell the securities or it is more likely than not that the entity will be required to sell the securities before recovery of its amortized cost basis. Additionally, this item includes OTTI losses recognized during the period on investments accounted for under the cost method of accounting.

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Amount, after effects of policies assumed or ceded, of expense related to the provision for policy benefits and costs incurred.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

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-Name Accounting Standards Codification

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Amount, after premiums ceded to other entities and premiums assumed by the entity, of premiums earned.

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-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 17

-Article 12

Reference 2: http://www.xbrl.org/2003/role/presentationRef

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-Name Accounting Standards Codification

-Topic 944

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-Section S99

-Paragraph 2

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-Topic 944

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-Subparagraph (SX 210.7-04.1)

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 944

-SubTopic 605

-Section 50

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-Name Accounting Standards Codification

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-Section S99

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-Subparagraph (SX 210.9-04.13(c))

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Amount, after premiums ceded to other entities and premiums assumed by the entity, of premiums written.

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This item represents the net total realized 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 or loss of held-to-maturity securities transferred to the trading security category and the cumulative unrealized gain or 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/or investments that are separately or otherwise not categorized as trading, available-for-sale, or held-to-maturity.

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Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

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