Consolidated Statements Of Operations and Comprehensive Income (USD $) In Millions, except Per Share data, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Revenues
Net premiums written	$ 17,799us-gaap_PremiumsWrittenNet	$ 17,025us-gaap_PremiumsWrittenNet	$ 16,075us-gaap_PremiumsWrittenNet
Increase in unearned premiums	(373)ace_ChangeInUnearnedPremiumNet	(412)ace_ChangeInUnearnedPremiumNet	(398)ace_ChangeInUnearnedPremiumNet
Net premiums earned	17,426us-gaap_PremiumsEarnedNet	16,613us-gaap_PremiumsEarnedNet	15,677us-gaap_PremiumsEarnedNet
Net investment income	2,252us-gaap_InvestmentIncomeNet	2,144us-gaap_InvestmentIncomeNet	2,181us-gaap_InvestmentIncomeNet
Net realized gains (losses):
Other-than-temporary impairment (OTTI) losses gross	(75)	(22)	(38)
Portion of OTTI losses recognized in other comprehensive income (OCI)	7		1
Net OTTI losses recognized in income	(68)	(22)	(37)
Net realized gains (losses) excluding OTTI losses	(439)	526	115
Total net realized gains (losses)	(507)ace_NetRealizedGainsLosses	504ace_NetRealizedGainsLosses	78ace_NetRealizedGainsLosses
Total revenues	19,171us-gaap_Revenues	19,261us-gaap_Revenues	17,936us-gaap_Revenues
Expenses
Losses and loss expenses	9,649	9,348	9,653
Policy benefits	517	515	521
Policy acquisition costs	3,075	2,659	2,446
Administrative expenses	2,245us-gaap_GeneralAndAdministrativeExpense	2,211us-gaap_GeneralAndAdministrativeExpense	2,096us-gaap_GeneralAndAdministrativeExpense
Interest expense	280us-gaap_InterestExpense	275us-gaap_InterestExpense	250us-gaap_InterestExpense
Other (income) expense	(82)us-gaap_OtherNonoperatingIncomeExpense	15us-gaap_OtherNonoperatingIncomeExpense	(6)us-gaap_OtherNonoperatingIncomeExpense
Total expenses	15,684us-gaap_BenefitsLossesAndExpenses	15,023us-gaap_BenefitsLossesAndExpenses	14,960us-gaap_BenefitsLossesAndExpenses
Income before income tax	3,487	4,238	2,976
Income tax expense	634us-gaap_IncomeTaxExpenseBenefit	480us-gaap_IncomeTaxExpenseBenefit	270us-gaap_IncomeTaxExpenseBenefit
Net income	2,853us-gaap_NetIncomeLoss	3,758us-gaap_NetIncomeLoss	2,706us-gaap_NetIncomeLoss
Other comprehensive income (loss)
Unrealized appreciation (depreciation)	820	(1,762)	1,350
Reclassification adjustment for net realized (gains) losses included in net income	24	(105)	(234)
Other comprehensive income (loss)after reclassification for net realized gains included in net income	844	(1,867)	1,116
Change in:
Cumulative translation adjustment	(632)	(339)	116
Pension liability	2		(35)
Other comprehensive income (loss), before income tax	214	(2,206)	1,197
Income tax benefit (expense) related to OCI items	(175)us-gaap_OtherComprehensiveIncomeLossTax	471us-gaap_OtherComprehensiveIncomeLossTax	(221)us-gaap_OtherComprehensiveIncomeLossTax
Other comprehensive income (loss)	39	(1,735)	976
Comprehensive income	$ 2,892	$ 2,023	$ 3,682
Earnings per share
Basic earnings per share	$ 8.50us-gaap_EarningsPerShareBasic	$ 11.02us-gaap_EarningsPerShareBasic	$ 7.96us-gaap_EarningsPerShareBasic
Diluted earnings per share	$ 8.42us-gaap_EarningsPerShareDiluted	$ 10.92us-gaap_EarningsPerShareDiluted	$ 7.89us-gaap_EarningsPerShareDiluted

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Amount before tax, after reclassification adjustments, of (increase) decrease in accumulated other comprehensive (income) loss related to pension and other postretirement defined benefit plans.

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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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-Publisher FASB

-Name Accounting Standards Codification

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-Section 50

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

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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

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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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-Publisher FASB

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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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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)

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-Article 12

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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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No definition available.

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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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