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Debt (Schedule of Debt Outstanding) (Details) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Jun. 01, 2014
May 01, 2014
Mar. 31, 2000
Debt Instrument [Line Items]          
Short-term debt $ 2,552us-gaap_ShortTermBorrowings $ 1,901us-gaap_ShortTermBorrowings      
Long-term debt 3,357us-gaap_LongTermDebt 3,807us-gaap_LongTermDebt      
Trust preferred securities 309us-gaap_JuniorSubordinatedDebentureOwedToUnconsolidatedSubsidiaryTrust 309us-gaap_JuniorSubordinatedDebentureOwedToUnconsolidatedSubsidiaryTrust      
Senior Notes          
Debt Instrument [Line Items]          
Long-term debt 3,357us-gaap_LongTermDebt
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember		 3,807us-gaap_LongTermDebt
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember		      
Senior Notes | ACE INA Senior Notes Due June 2014          
Debt Instrument [Line Items]          
Short-term debt 0us-gaap_ShortTermBorrowings
/ us-gaap_DebtInstrumentAxis
= ace_AceInaSeniorNotesDueJune2014Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember		 500us-gaap_ShortTermBorrowings
/ us-gaap_DebtInstrumentAxis
= ace_AceInaSeniorNotesDueJune2014Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember		      
Long-term debt stated interest rate 5.875%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= ace_AceInaSeniorNotesDueJune2014Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember		   5.875%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= ace_AceInaSeniorNotesDueJune2014Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember		    
Additional percentage on 'make-whole' premium 0.20%ace_MakeWholePremiumAdditionalPercent
/ us-gaap_DebtInstrumentAxis
= ace_AceInaSeniorNotesDueJune2014Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember		        
Long-term Debt, Current Maturities     500us-gaap_LongTermDebtCurrent
/ us-gaap_DebtInstrumentAxis
= ace_AceInaSeniorNotesDueJune2014Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember		    
Senior Notes | ACE INA senior notes due 2015          
Debt Instrument [Line Items]          
Short-term debt 450us-gaap_ShortTermBorrowings
/ us-gaap_DebtInstrumentAxis
= ace_AceInaSeniorNotesDueMay2015Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember		 0us-gaap_ShortTermBorrowings
/ us-gaap_DebtInstrumentAxis
= ace_AceInaSeniorNotesDueMay2015Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember		      
Long-term debt 0us-gaap_LongTermDebt
/ us-gaap_DebtInstrumentAxis
= ace_AceInaSeniorNotesDueMay2015Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember		 449us-gaap_LongTermDebt
/ us-gaap_DebtInstrumentAxis
= ace_AceInaSeniorNotesDueMay2015Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember		      
Long-term debt stated interest rate 5.60%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= ace_AceInaSeniorNotesDueMay2015Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember		        
Additional percentage on 'make-whole' premium 0.35%ace_MakeWholePremiumAdditionalPercent
/ us-gaap_DebtInstrumentAxis
= ace_AceInaSeniorNotesDueMay2015Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember		        
Senior Notes | ACE INA senior notes due 2015          
Debt Instrument [Line Items]          
Short-term debt 700us-gaap_ShortTermBorrowings
/ us-gaap_DebtInstrumentAxis
= ace_AceInaSeniorNotesDueNovember2015Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember		 0us-gaap_ShortTermBorrowings
/ us-gaap_DebtInstrumentAxis
= ace_AceInaSeniorNotesDueNovember2015Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember		      
Long-term debt 0us-gaap_LongTermDebt
/ us-gaap_DebtInstrumentAxis
= ace_AceInaSeniorNotesDueNovember2015Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember		 700us-gaap_LongTermDebt
/ us-gaap_DebtInstrumentAxis
= ace_AceInaSeniorNotesDueNovember2015Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember		   700us-gaap_LongTermDebt
/ us-gaap_DebtInstrumentAxis
= ace_AceInaSeniorNotesDueNovember2015Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember		  
Long-term debt stated interest rate 2.60%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= ace_AceInaSeniorNotesDueNovember2015Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember		     3.35%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= ace_AceInaSeniorNotesDueNovember2015Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember		  
Additional percentage on 'make-whole' premium 0.20%ace_MakeWholePremiumAdditionalPercent
/ us-gaap_DebtInstrumentAxis
= ace_AceInaSeniorNotesDueNovember2015Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember		        
Senior Notes | ACE INA senior notes due 2017          
Debt Instrument [Line Items]          
Long-term debt 500us-gaap_LongTermDebt
/ us-gaap_DebtInstrumentAxis
= ace_AceInaSeniorNotesDueFebruary2017Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember		 500us-gaap_LongTermDebt
/ us-gaap_DebtInstrumentAxis
= ace_AceInaSeniorNotesDueFebruary2017Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember		      
Long-term debt stated interest rate 5.70%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= ace_AceInaSeniorNotesDueFebruary2017Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember		        
Additional percentage on 'make-whole' premium 0.20%ace_MakeWholePremiumAdditionalPercent
/ us-gaap_DebtInstrumentAxis
= ace_AceInaSeniorNotesDueFebruary2017Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember		        
Senior Notes | ACE INA senior notes due 2018          
Debt Instrument [Line Items]          
Long-term debt 300us-gaap_LongTermDebt
/ us-gaap_DebtInstrumentAxis
= ace_AceInaSeniorNotesDueMarch2018Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember		 300us-gaap_LongTermDebt
/ us-gaap_DebtInstrumentAxis
= ace_AceInaSeniorNotesDueMarch2018Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember		      
Long-term debt stated interest rate 5.80%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= ace_AceInaSeniorNotesDueMarch2018Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember		        
Additional percentage on 'make-whole' premium 0.35%ace_MakeWholePremiumAdditionalPercent
/ us-gaap_DebtInstrumentAxis
= ace_AceInaSeniorNotesDueMarch2018Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember		        
Senior Notes | ACE INA senior notes due 2019          
Debt Instrument [Line Items]          
Long-term debt 500us-gaap_LongTermDebt
/ us-gaap_DebtInstrumentAxis
= ace_AceInaSeniorNotesDueJune2019Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember		 500us-gaap_LongTermDebt
/ us-gaap_DebtInstrumentAxis
= ace_AceInaSeniorNotesDueJune2019Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember		      
Long-term debt stated interest rate 5.90%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= ace_AceInaSeniorNotesDueJune2019Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember		        
Additional percentage on 'make-whole' premium 0.40%ace_MakeWholePremiumAdditionalPercent
/ us-gaap_DebtInstrumentAxis
= ace_AceInaSeniorNotesDueJune2019Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember		        
Senior Notes | ACE INA senior notes due 2023          
Debt Instrument [Line Items]          
Long-term debt 474us-gaap_LongTermDebt
/ us-gaap_DebtInstrumentAxis
= ace_AceInaSeniorNotesDueMarch2023Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember		 473us-gaap_LongTermDebt
/ us-gaap_DebtInstrumentAxis
= ace_AceInaSeniorNotesDueMarch2023Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember		      
Long-term debt stated interest rate 2.70%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= ace_AceInaSeniorNotesDueMarch2023Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember		        
Additional percentage on 'make-whole' premium 0.10%ace_MakeWholePremiumAdditionalPercent
/ us-gaap_DebtInstrumentAxis
= ace_AceInaSeniorNotesDueMarch2023Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember		        
Senior Notes | ACE INA Senior Notes Due May 2024          
Debt Instrument [Line Items]          
Long-term debt 699us-gaap_LongTermDebt
/ us-gaap_DebtInstrumentAxis
= ace_ACEINASeniorNotesDueMay2024Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember		        
Long-term debt stated interest rate 3.35%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= ace_ACEINASeniorNotesDueMay2024Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember		        
Additional percentage on 'make-whole' premium 0.15%ace_MakeWholePremiumAdditionalPercent
/ us-gaap_DebtInstrumentAxis
= ace_ACEINASeniorNotesDueMay2024Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember		        
Senior Notes | ACE INA senior notes due 2036          
Debt Instrument [Line Items]          
Long-term debt 299us-gaap_LongTermDebt
/ us-gaap_DebtInstrumentAxis
= ace_AceInaSeniorNotesDueMay2036Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember		 299us-gaap_LongTermDebt
/ us-gaap_DebtInstrumentAxis
= ace_AceInaSeniorNotesDueMay2036Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember		      
Long-term debt stated interest rate 6.70%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= ace_AceInaSeniorNotesDueMay2036Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember		        
Additional percentage on 'make-whole' premium 0.20%ace_MakeWholePremiumAdditionalPercent
/ us-gaap_DebtInstrumentAxis
= ace_AceInaSeniorNotesDueMay2036Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember		        
Senior Notes | ACE INA senior notes due 2043          
Debt Instrument [Line Items]          
Long-term debt 474us-gaap_LongTermDebt
/ us-gaap_DebtInstrumentAxis
= ace_AceAceinaseniornotesduemarch2043MemberMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember		 474us-gaap_LongTermDebt
/ us-gaap_DebtInstrumentAxis
= ace_AceAceinaseniornotesduemarch2043MemberMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember		      
Long-term debt stated interest rate 4.15%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= ace_AceAceinaseniornotesduemarch2043MemberMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember		        
Additional percentage on 'make-whole' premium 0.15%ace_MakeWholePremiumAdditionalPercent
/ us-gaap_DebtInstrumentAxis
= ace_AceAceinaseniornotesduemarch2043MemberMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember		        
Senior Notes | Other          
Debt Instrument [Line Items]          
Long-term debt 11us-gaap_LongTermDebt
/ us-gaap_DebtInstrumentAxis
= ace_PennsylvaniaIndustrialDevelopmentAuthorityPidaAndCityOfPhiladelphiaUrbanDevelopmentActionGrantMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember		 12us-gaap_LongTermDebt
/ us-gaap_DebtInstrumentAxis
= ace_PennsylvaniaIndustrialDevelopmentAuthorityPidaAndCityOfPhiladelphiaUrbanDevelopmentActionGrantMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember		      
Senior secured debentures | ACE INA debentures due 2029          
Debt Instrument [Line Items]          
Long-term debt 100us-gaap_LongTermDebt
/ us-gaap_DebtInstrumentAxis
= ace_AceInaSeniorNotesDueAugust2029Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_DebenturesSubjectToMandatoryRedemptionMember		 100us-gaap_LongTermDebt
/ us-gaap_DebtInstrumentAxis
= ace_AceInaSeniorNotesDueAugust2029Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_DebenturesSubjectToMandatoryRedemptionMember		      
Long-term debt stated interest rate 8.875%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= ace_AceInaSeniorNotesDueAugust2029Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_DebenturesSubjectToMandatoryRedemptionMember		        
Trust Preferred Securities | ACE INA capital securities due 2030          
Debt Instrument [Line Items]          
Trust preferred securities 309us-gaap_JuniorSubordinatedDebentureOwedToUnconsolidatedSubsidiaryTrust
/ us-gaap_DebtInstrumentAxis
= ace_AceInaCapitalSecuritiesDue2030Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_TrustPreferredSecuritiesSubjectToMandatoryRedemptionMember		 309us-gaap_JuniorSubordinatedDebentureOwedToUnconsolidatedSubsidiaryTrust
/ us-gaap_DebtInstrumentAxis
= ace_AceInaCapitalSecuritiesDue2030Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_TrustPreferredSecuritiesSubjectToMandatoryRedemptionMember		      
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
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		      
Weighted average interest rate on short-term debt 0.30%us-gaap_ShortTermDebtWeightedAverageInterestRate
/ us-gaap_ShortTermDebtTypeAxis
= us-gaap_SecuritiesSoldUnderAgreementsToRepurchaseMember		        
Minimum | Senior Notes | Other          
Debt Instrument [Line Items]          
Long-term debt stated interest rate 2.75%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= ace_PennsylvaniaIndustrialDevelopmentAuthorityPidaAndCityOfPhiladelphiaUrbanDevelopmentActionGrantMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember		        
Maximum | Senior Notes | Other          
Debt Instrument [Line Items]          
Long-term debt stated interest rate 7.10%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= ace_PennsylvaniaIndustrialDevelopmentAuthorityPidaAndCityOfPhiladelphiaUrbanDevelopmentActionGrantMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember