Intangible Assets (Roll-forward of Goodwill, by Business Segment) (Details) (USD $) In Millions, unless otherwise specified
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12 Months Ended |
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Dec. 31, 2014
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Dec. 31, 2013
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Apr. 02, 2013
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May 02, 2013
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Oct. 31, 2014
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Goodwill [Roll Forward] |
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Balance at beginning of period |
$ 4,603us-gaap_Goodwill |
$ 4,319us-gaap_Goodwill |
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Purchase price allocation adjustment |
4us-gaap_GoodwillPurchaseAccountingAdjustments |
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Foreign exchange revaluation and other |
(198)us-gaap_GoodwillTranslationAdjustments |
(134)us-gaap_GoodwillTranslationAdjustments |
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Balance at end of period |
4,904us-gaap_Goodwill |
4,603us-gaap_Goodwill |
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Insurance - North American P&C |
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Goodwill [Roll Forward] |
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Balance at beginning of period |
1,215us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = ace_SegmentInsuranceNorthAmericanPcMember |
1,219us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = ace_SegmentInsuranceNorthAmericanPcMember |
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Purchase price allocation adjustment |
0us-gaap_GoodwillPurchaseAccountingAdjustments / us-gaap_StatementBusinessSegmentsAxis = ace_SegmentInsuranceNorthAmericanPcMember |
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Foreign exchange revaluation and other |
(4)us-gaap_GoodwillTranslationAdjustments / us-gaap_StatementBusinessSegmentsAxis = ace_SegmentInsuranceNorthAmericanPcMember |
(4)us-gaap_GoodwillTranslationAdjustments / us-gaap_StatementBusinessSegmentsAxis = ace_SegmentInsuranceNorthAmericanPcMember |
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Balance at end of period |
1,211us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = ace_SegmentInsuranceNorthAmericanPcMember |
1,215us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = ace_SegmentInsuranceNorthAmericanPcMember |
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Insurance - North American Agriculture |
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Goodwill [Roll Forward] |
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Balance at beginning of period |
134us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = ace_SegmentInsuranceNorthAmericanAgricultureMember |
134us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = ace_SegmentInsuranceNorthAmericanAgricultureMember |
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Purchase price allocation adjustment |
0us-gaap_GoodwillPurchaseAccountingAdjustments / us-gaap_StatementBusinessSegmentsAxis = ace_SegmentInsuranceNorthAmericanAgricultureMember |
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Foreign exchange revaluation and other |
0us-gaap_GoodwillTranslationAdjustments / us-gaap_StatementBusinessSegmentsAxis = ace_SegmentInsuranceNorthAmericanAgricultureMember |
0us-gaap_GoodwillTranslationAdjustments / us-gaap_StatementBusinessSegmentsAxis = ace_SegmentInsuranceNorthAmericanAgricultureMember |
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Balance at end of period |
134us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = ace_SegmentInsuranceNorthAmericanAgricultureMember |
134us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = ace_SegmentInsuranceNorthAmericanAgricultureMember |
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Insurance - Overseas General |
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Goodwill [Roll Forward] |
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Balance at beginning of period |
2,054us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = ace_SegmentInsuranceOverseasGeneralMember |
1,764us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = ace_SegmentInsuranceOverseasGeneralMember |
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Purchase price allocation adjustment |
4us-gaap_GoodwillPurchaseAccountingAdjustments / us-gaap_StatementBusinessSegmentsAxis = ace_SegmentInsuranceOverseasGeneralMember |
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Foreign exchange revaluation and other |
(187)us-gaap_GoodwillTranslationAdjustments / us-gaap_StatementBusinessSegmentsAxis = ace_SegmentInsuranceOverseasGeneralMember |
(128)us-gaap_GoodwillTranslationAdjustments / us-gaap_StatementBusinessSegmentsAxis = ace_SegmentInsuranceOverseasGeneralMember |
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Balance at end of period |
2,366us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = ace_SegmentInsuranceOverseasGeneralMember |
2,054us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = ace_SegmentInsuranceOverseasGeneralMember |
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Global Reinsurance |
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Goodwill [Roll Forward] |
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Balance at beginning of period |
365us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = ace_SegmentGlobalReMember |
365us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = ace_SegmentGlobalReMember |
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Purchase price allocation adjustment |
0us-gaap_GoodwillPurchaseAccountingAdjustments / us-gaap_StatementBusinessSegmentsAxis = ace_SegmentGlobalReMember |
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Foreign exchange revaluation and other |
0us-gaap_GoodwillTranslationAdjustments / us-gaap_StatementBusinessSegmentsAxis = ace_SegmentGlobalReMember |
0us-gaap_GoodwillTranslationAdjustments / us-gaap_StatementBusinessSegmentsAxis = ace_SegmentGlobalReMember |
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Balance at end of period |
365us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = ace_SegmentGlobalReMember |
365us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = ace_SegmentGlobalReMember |
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Life |
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Goodwill [Roll Forward] |
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Balance at beginning of period |
835us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = ace_SegmentLifeMember |
837us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = ace_SegmentLifeMember |
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Purchase price allocation adjustment |
0us-gaap_GoodwillPurchaseAccountingAdjustments / us-gaap_StatementBusinessSegmentsAxis = ace_SegmentLifeMember |
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Foreign exchange revaluation and other |
(7)us-gaap_GoodwillTranslationAdjustments / us-gaap_StatementBusinessSegmentsAxis = ace_SegmentLifeMember |
(2)us-gaap_GoodwillTranslationAdjustments / us-gaap_StatementBusinessSegmentsAxis = ace_SegmentLifeMember |
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Balance at end of period |
828us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = ace_SegmentLifeMember |
835us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = ace_SegmentLifeMember |
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Fianzas Monterrey |
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Goodwill [Roll Forward] |
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Balance at beginning of period |
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137us-gaap_Goodwill / us-gaap_BusinessAcquisitionAxis = ace_FianzasMonterreyMember |
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Acquisition |
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135us-gaap_GoodwillAcquiredDuringPeriod / us-gaap_BusinessAcquisitionAxis = ace_FianzasMonterreyMember |
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Balance at end of period |
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137us-gaap_Goodwill / us-gaap_BusinessAcquisitionAxis = ace_FianzasMonterreyMember |
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Fianzas Monterrey | Insurance - North American P&C |
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Goodwill [Roll Forward] |
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Acquisition |
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0us-gaap_GoodwillAcquiredDuringPeriod / us-gaap_BusinessAcquisitionAxis = ace_FianzasMonterreyMember / us-gaap_StatementBusinessSegmentsAxis = ace_SegmentInsuranceNorthAmericanPcMember |
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Fianzas Monterrey | Insurance - North American Agriculture |
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Goodwill [Roll Forward] |
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Acquisition |
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0us-gaap_GoodwillAcquiredDuringPeriod / us-gaap_BusinessAcquisitionAxis = ace_FianzasMonterreyMember / us-gaap_StatementBusinessSegmentsAxis = ace_SegmentInsuranceNorthAmericanAgricultureMember |
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Fianzas Monterrey | Insurance - Overseas General |
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Goodwill [Roll Forward] |
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Acquisition |
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135us-gaap_GoodwillAcquiredDuringPeriod / us-gaap_BusinessAcquisitionAxis = ace_FianzasMonterreyMember / us-gaap_StatementBusinessSegmentsAxis = ace_SegmentInsuranceOverseasGeneralMember |
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Fianzas Monterrey | Global Reinsurance |
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Goodwill [Roll Forward] |
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Acquisition |
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0us-gaap_GoodwillAcquiredDuringPeriod / us-gaap_BusinessAcquisitionAxis = ace_FianzasMonterreyMember / us-gaap_StatementBusinessSegmentsAxis = ace_SegmentGlobalReMember |
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Fianzas Monterrey | Life |
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Goodwill [Roll Forward] |
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Acquisition |
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0us-gaap_GoodwillAcquiredDuringPeriod / us-gaap_BusinessAcquisitionAxis = ace_FianzasMonterreyMember / us-gaap_StatementBusinessSegmentsAxis = ace_SegmentLifeMember |
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ABA Seguros |
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Goodwill [Roll Forward] |
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Balance at beginning of period |
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285us-gaap_Goodwill / us-gaap_BusinessAcquisitionAxis = ace_AbaSegurosMember |
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Acquisition |
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283us-gaap_GoodwillAcquiredDuringPeriod / us-gaap_BusinessAcquisitionAxis = ace_AbaSegurosMember |
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Balance at end of period |
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285us-gaap_Goodwill / us-gaap_BusinessAcquisitionAxis = ace_AbaSegurosMember |
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ABA Seguros | Insurance - North American P&C |
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Goodwill [Roll Forward] |
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Acquisition |
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0us-gaap_GoodwillAcquiredDuringPeriod / us-gaap_BusinessAcquisitionAxis = ace_AbaSegurosMember / us-gaap_StatementBusinessSegmentsAxis = ace_SegmentInsuranceNorthAmericanPcMember |
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ABA Seguros | Insurance - North American Agriculture |
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Goodwill [Roll Forward] |
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Acquisition |
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0us-gaap_GoodwillAcquiredDuringPeriod / us-gaap_BusinessAcquisitionAxis = ace_AbaSegurosMember / us-gaap_StatementBusinessSegmentsAxis = ace_SegmentInsuranceNorthAmericanAgricultureMember |
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ABA Seguros | Insurance - Overseas General |
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Goodwill [Roll Forward] |
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Acquisition |
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283us-gaap_GoodwillAcquiredDuringPeriod / us-gaap_BusinessAcquisitionAxis = ace_AbaSegurosMember / us-gaap_StatementBusinessSegmentsAxis = ace_SegmentInsuranceOverseasGeneralMember |
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ABA Seguros | Global Reinsurance |
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Goodwill [Roll Forward] |
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Acquisition |
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0us-gaap_GoodwillAcquiredDuringPeriod / us-gaap_BusinessAcquisitionAxis = ace_AbaSegurosMember / us-gaap_StatementBusinessSegmentsAxis = ace_SegmentGlobalReMember |
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ABA Seguros | Life |
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Goodwill [Roll Forward] |
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Acquisition |
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0us-gaap_GoodwillAcquiredDuringPeriod / us-gaap_BusinessAcquisitionAxis = ace_AbaSegurosMember / us-gaap_StatementBusinessSegmentsAxis = ace_SegmentLifeMember |
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The Siam Commercial Samaggi Insurance PCL [Member] |
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Goodwill [Roll Forward] |
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Acquisition |
46us-gaap_GoodwillAcquiredDuringPeriod / us-gaap_BusinessAcquisitionAxis = ace_TheSiamCommercialSamaggiInsurancePCLMember |
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The Siam Commercial Samaggi Insurance PCL [Member] | Insurance - North American P&C |
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Goodwill [Roll Forward] |
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Acquisition |
0us-gaap_GoodwillAcquiredDuringPeriod / us-gaap_BusinessAcquisitionAxis = ace_TheSiamCommercialSamaggiInsurancePCLMember / us-gaap_StatementBusinessSegmentsAxis = ace_SegmentInsuranceNorthAmericanPcMember |
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The Siam Commercial Samaggi Insurance PCL [Member] | Insurance - North American Agriculture |
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Goodwill [Roll Forward] |
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Acquisition |
0us-gaap_GoodwillAcquiredDuringPeriod / us-gaap_BusinessAcquisitionAxis = ace_TheSiamCommercialSamaggiInsurancePCLMember / us-gaap_StatementBusinessSegmentsAxis = ace_SegmentInsuranceNorthAmericanAgricultureMember |
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The Siam Commercial Samaggi Insurance PCL [Member] | Insurance - Overseas General |
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Goodwill [Roll Forward] |
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Acquisition |
46us-gaap_GoodwillAcquiredDuringPeriod / us-gaap_BusinessAcquisitionAxis = ace_TheSiamCommercialSamaggiInsurancePCLMember / us-gaap_StatementBusinessSegmentsAxis = ace_SegmentInsuranceOverseasGeneralMember |
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Large Corporate Property And Casualty Business Of Itau Seguros [Member] |
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Goodwill [Roll Forward] |
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Balance at beginning of period |
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449us-gaap_Goodwill / us-gaap_BusinessAcquisitionAxis = ace_LargeCorporatePropertyAndCasualtyBusinessOfItauSegurosMember |
Acquisition |
449us-gaap_GoodwillAcquiredDuringPeriod / us-gaap_BusinessAcquisitionAxis = ace_LargeCorporatePropertyAndCasualtyBusinessOfItauSegurosMember |
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Balance at end of period |
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449us-gaap_Goodwill / us-gaap_BusinessAcquisitionAxis = ace_LargeCorporatePropertyAndCasualtyBusinessOfItauSegurosMember |
Large Corporate Property And Casualty Business Of Itau Seguros [Member] | Insurance - North American P&C |
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Goodwill [Roll Forward] |
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Acquisition |
0us-gaap_GoodwillAcquiredDuringPeriod / us-gaap_BusinessAcquisitionAxis = ace_LargeCorporatePropertyAndCasualtyBusinessOfItauSegurosMember / us-gaap_StatementBusinessSegmentsAxis = ace_SegmentInsuranceNorthAmericanPcMember |
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Large Corporate Property And Casualty Business Of Itau Seguros [Member] | Insurance - Overseas General |
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Goodwill [Roll Forward] |
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Acquisition |
449us-gaap_GoodwillAcquiredDuringPeriod / us-gaap_BusinessAcquisitionAxis = ace_LargeCorporatePropertyAndCasualtyBusinessOfItauSegurosMember / us-gaap_StatementBusinessSegmentsAxis = ace_SegmentInsuranceOverseasGeneralMember |
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Large Corporate Property And Casualty Business Of Itau Seguros [Member] | Global Reinsurance |
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Goodwill [Roll Forward] |
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Acquisition |
0us-gaap_GoodwillAcquiredDuringPeriod / us-gaap_BusinessAcquisitionAxis = ace_LargeCorporatePropertyAndCasualtyBusinessOfItauSegurosMember / us-gaap_StatementBusinessSegmentsAxis = ace_SegmentGlobalReMember |
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Large Corporate Property And Casualty Business Of Itau Seguros [Member] | Life |
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Goodwill [Roll Forward] |
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Acquisition |
$ 0us-gaap_GoodwillAcquiredDuringPeriod / us-gaap_BusinessAcquisitionAxis = ace_LargeCorporatePropertyAndCasualtyBusinessOfItauSegurosMember / us-gaap_StatementBusinessSegmentsAxis = ace_SegmentLifeMember |
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