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Unpaid losses and loss expenses (A&E Loss Roll-forward) (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Unpaid Losses and Loss Expenses [Roll Forward]    
Balance (gross) at December 31, 2013 $ 1,839us-gaap_LiabilityForAsbestosAndEnvironmentalClaimsGross  
Balance (net) at December 31, 2013 1,051us-gaap_LiabilityForAsbestosAndEnvironmentalClaimsNet  
Incurred activity, gross 300us-gaap_LiabilityForAsbestosAndEnvironmentalClaimsGrossIncurredLoss  
Incurred activity, net 210us-gaap_LiabilityForAsbestosAndEnvironmentalClaimsNetIncurredLoss [1] 171us-gaap_LiabilityForAsbestosAndEnvironmentalClaimsNetIncurredLoss
Paid activity, gross (440)us-gaap_LiabilityForAsbestosAndEnvironmentalClaimsGrossClaimsPaid  
Paid activity, net (220)us-gaap_LiabilityForAsbestosAndEnvironmentalClaimsNetClaimsPaid  
Balance (gross) at December 31, 2014 1,699us-gaap_LiabilityForAsbestosAndEnvironmentalClaimsGross 1,839us-gaap_LiabilityForAsbestosAndEnvironmentalClaimsGross
Balance (net) at December 31, 2014 1,041us-gaap_LiabilityForAsbestosAndEnvironmentalClaimsNet 1,051us-gaap_LiabilityForAsbestosAndEnvironmentalClaimsNet
Asbestos    
Unpaid Losses and Loss Expenses [Roll Forward]    
Balance (gross) at December 31, 2013 1,644us-gaap_LiabilityForAsbestosAndEnvironmentalClaimsGross
/ ace_LiabilityForAsbestosAndEnvironmentalClaimsAxis
= us-gaap_AsbestosIssueMember
 
Balance (net) at December 31, 2013 926us-gaap_LiabilityForAsbestosAndEnvironmentalClaimsNet
/ ace_LiabilityForAsbestosAndEnvironmentalClaimsAxis
= us-gaap_AsbestosIssueMember
 
Incurred activity, gross 187us-gaap_LiabilityForAsbestosAndEnvironmentalClaimsGrossIncurredLoss
/ ace_LiabilityForAsbestosAndEnvironmentalClaimsAxis
= us-gaap_AsbestosIssueMember
 
Incurred activity, net 113us-gaap_LiabilityForAsbestosAndEnvironmentalClaimsNetIncurredLoss
/ ace_LiabilityForAsbestosAndEnvironmentalClaimsAxis
= us-gaap_AsbestosIssueMember
 
Paid activity, gross (331)us-gaap_LiabilityForAsbestosAndEnvironmentalClaimsGrossClaimsPaid
/ ace_LiabilityForAsbestosAndEnvironmentalClaimsAxis
= us-gaap_AsbestosIssueMember
 
Paid activity, net (147)us-gaap_LiabilityForAsbestosAndEnvironmentalClaimsNetClaimsPaid
/ ace_LiabilityForAsbestosAndEnvironmentalClaimsAxis
= us-gaap_AsbestosIssueMember
 
Balance (gross) at December 31, 2014 1,500us-gaap_LiabilityForAsbestosAndEnvironmentalClaimsGross
/ ace_LiabilityForAsbestosAndEnvironmentalClaimsAxis
= us-gaap_AsbestosIssueMember
 
Balance (net) at December 31, 2014 892us-gaap_LiabilityForAsbestosAndEnvironmentalClaimsNet
/ ace_LiabilityForAsbestosAndEnvironmentalClaimsAxis
= us-gaap_AsbestosIssueMember
 
Environmental    
Unpaid Losses and Loss Expenses [Roll Forward]    
Balance (gross) at December 31, 2013 195us-gaap_LiabilityForAsbestosAndEnvironmentalClaimsGross
/ ace_LiabilityForAsbestosAndEnvironmentalClaimsAxis
= us-gaap_EnvironmentalIssueMember
 
Balance (net) at December 31, 2013 125us-gaap_LiabilityForAsbestosAndEnvironmentalClaimsNet
/ ace_LiabilityForAsbestosAndEnvironmentalClaimsAxis
= us-gaap_EnvironmentalIssueMember
 
Incurred activity, gross 113us-gaap_LiabilityForAsbestosAndEnvironmentalClaimsGrossIncurredLoss
/ ace_LiabilityForAsbestosAndEnvironmentalClaimsAxis
= us-gaap_EnvironmentalIssueMember
 
Incurred activity, net 97us-gaap_LiabilityForAsbestosAndEnvironmentalClaimsNetIncurredLoss
/ ace_LiabilityForAsbestosAndEnvironmentalClaimsAxis
= us-gaap_EnvironmentalIssueMember
 
Paid activity, gross (109)us-gaap_LiabilityForAsbestosAndEnvironmentalClaimsGrossClaimsPaid
/ ace_LiabilityForAsbestosAndEnvironmentalClaimsAxis
= us-gaap_EnvironmentalIssueMember
 
Paid activity, net (73)us-gaap_LiabilityForAsbestosAndEnvironmentalClaimsNetClaimsPaid
/ ace_LiabilityForAsbestosAndEnvironmentalClaimsAxis
= us-gaap_EnvironmentalIssueMember
 
Balance (gross) at December 31, 2014 199us-gaap_LiabilityForAsbestosAndEnvironmentalClaimsGross
/ ace_LiabilityForAsbestosAndEnvironmentalClaimsAxis
= us-gaap_EnvironmentalIssueMember
 
Balance (net) at December 31, 2014 $ 149us-gaap_LiabilityForAsbestosAndEnvironmentalClaimsNet
/ ace_LiabilityForAsbestosAndEnvironmentalClaimsAxis
= us-gaap_EnvironmentalIssueMember
 
[1] (1)Excludes unallocated loss expenses and the net activity reflects third-party reinsurance other than the aggregate excess of loss reinsurance provided by National Indemnity Company (NICO) to Westchester Specialty (see Westchester Specialty section below).