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Debt (Narrative) (Details) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Mar. 31, 2000
Debt Instrument [Line Items]      
Short-term debt $ 2,552us-gaap_ShortTermBorrowings $ 1,901us-gaap_ShortTermBorrowings  
Current amount of long-term debt outstanding 3,357us-gaap_LongTermDebt 3,807us-gaap_LongTermDebt  
Trust Preferred Securities | ACE INA capital securities due 2030      
Debt Instrument [Line Items]      
Long-term debt stated interest rate 9.70%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= ace_AceInaCapitalSecuritiesDue2030Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_TrustPreferredSecuritiesSubjectToMandatoryRedemptionMember
  9.70%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= ace_AceInaCapitalSecuritiesDue2030Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_TrustPreferredSecuritiesSubjectToMandatoryRedemptionMember
Debt issued 309us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= ace_AceInaCapitalSecuritiesDue2030Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_TrustPreferredSecuritiesSubjectToMandatoryRedemptionMember
  300us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= ace_AceInaCapitalSecuritiesDue2030Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_TrustPreferredSecuritiesSubjectToMandatoryRedemptionMember
ACE Capital Trust II common securities purchased     9.2ace_CommonTrustSecuritiesPurchased
/ us-gaap_DebtInstrumentAxis
= ace_AceInaCapitalSecuritiesDue2030Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_TrustPreferredSecuritiesSubjectToMandatoryRedemptionMember
Repurchase agreements      
Debt Instrument [Line Items]      
Short-term debt $ 1,402us-gaap_ShortTermBorrowings
/ us-gaap_ShortTermDebtTypeAxis
= us-gaap_SecuritiesSoldUnderAgreementsToRepurchaseMember
$ 1,401us-gaap_ShortTermBorrowings
/ us-gaap_ShortTermDebtTypeAxis
= us-gaap_SecuritiesSoldUnderAgreementsToRepurchaseMember