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Reinsurance (Reinsurance Recoverable on Ceded Reinsurance) (Details) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Reinsurance Disclosures [Abstract]        
Reinsurance recoverable on unpaid losses and loss expenses $ 11,307ace_ReinsuranceRecoverableUnpaidLossesAndLossExpensesNet [1] $ 10,612ace_ReinsuranceRecoverableUnpaidLossesAndLossExpensesNet [1] $ 11,399ace_ReinsuranceRecoverableUnpaidLossesAndLossExpensesNet $ 11,602ace_ReinsuranceRecoverableUnpaidLossesAndLossExpensesNet
Reinsurance recoverable on paid losses and loss expenses 685ace_ReinsuranceRecoverablePaidLossesAndLossExpensesNet [1] 615ace_ReinsuranceRecoverablePaidLossesAndLossExpensesNet [1]    
Net reinsurance recoverable on losses and loss expenses $ 11,992ace_ReinsuranceRecoverableLossesAndLossExpenses $ 11,227ace_ReinsuranceRecoverableLossesAndLossExpenses    
[1] (1) Net of a provision for uncollectible reinsurance.