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Segment Information (Net Premiums Earned For Segment By Product) (Detail) (USD $)
In Millions, unless otherwise specified
3 Months Ended 12 Months Ended
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Segment Reporting Information [Line Items]                      
Net premiums earned $ 4,370us-gaap_PremiumsEarnedNet $ 4,754us-gaap_PremiumsEarnedNet $ 4,332us-gaap_PremiumsEarnedNet $ 3,970us-gaap_PremiumsEarnedNet $ 4,363us-gaap_PremiumsEarnedNet $ 4,610us-gaap_PremiumsEarnedNet $ 4,067us-gaap_PremiumsEarnedNet $ 3,573us-gaap_PremiumsEarnedNet $ 17,426us-gaap_PremiumsEarnedNet $ 16,613us-gaap_PremiumsEarnedNet $ 15,677us-gaap_PremiumsEarnedNet
Property and all other                      
Segment Reporting Information [Line Items]                      
Net premiums earned                 6,687us-gaap_PremiumsEarnedNet
/ us-gaap_ProductOrServiceAxis
= us-gaap_PropertyInsuranceProductLineMember
6,382us-gaap_PremiumsEarnedNet
/ us-gaap_ProductOrServiceAxis
= us-gaap_PropertyInsuranceProductLineMember
5,973us-gaap_PremiumsEarnedNet
/ us-gaap_ProductOrServiceAxis
= us-gaap_PropertyInsuranceProductLineMember
Casualty Insurance Product Line [Member]                      
Segment Reporting Information [Line Items]                      
Net premiums earned                 6,080us-gaap_PremiumsEarnedNet
/ us-gaap_ProductOrServiceAxis
= ace_CasualtyInsuranceProductLineMember
5,759us-gaap_PremiumsEarnedNet
/ us-gaap_ProductOrServiceAxis
= ace_CasualtyInsuranceProductLineMember
5,292us-gaap_PremiumsEarnedNet
/ us-gaap_ProductOrServiceAxis
= ace_CasualtyInsuranceProductLineMember
Life Accident And Health Product Line [Member]                      
Segment Reporting Information [Line Items]                      
Net premiums earned                 4,659us-gaap_PremiumsEarnedNet
/ us-gaap_ProductOrServiceAxis
= ace_LifeAccidentAndHealthProductLineMember
4,472us-gaap_PremiumsEarnedNet
/ us-gaap_ProductOrServiceAxis
= ace_LifeAccidentAndHealthProductLineMember
4,412us-gaap_PremiumsEarnedNet
/ us-gaap_ProductOrServiceAxis
= ace_LifeAccidentAndHealthProductLineMember
Insurance - North American P&C                      
Segment Reporting Information [Line Items]                      
Net premiums earned                 6,107us-gaap_PremiumsEarnedNet
/ us-gaap_StatementBusinessSegmentsAxis
= ace_SegmentInsuranceNorthAmericanPcMember
5,721us-gaap_PremiumsEarnedNet
/ us-gaap_StatementBusinessSegmentsAxis
= ace_SegmentInsuranceNorthAmericanPcMember
5,147us-gaap_PremiumsEarnedNet
/ us-gaap_StatementBusinessSegmentsAxis
= ace_SegmentInsuranceNorthAmericanPcMember
Insurance - North American P&C | Property and all other                      
Segment Reporting Information [Line Items]                      
Net premiums earned                 1,662us-gaap_PremiumsEarnedNet
/ us-gaap_ProductOrServiceAxis
= us-gaap_PropertyInsuranceProductLineMember
/ us-gaap_StatementBusinessSegmentsAxis
= ace_SegmentInsuranceNorthAmericanPcMember
1,489us-gaap_PremiumsEarnedNet
/ us-gaap_ProductOrServiceAxis
= us-gaap_PropertyInsuranceProductLineMember
/ us-gaap_StatementBusinessSegmentsAxis
= ace_SegmentInsuranceNorthAmericanPcMember
1,370us-gaap_PremiumsEarnedNet
/ us-gaap_ProductOrServiceAxis
= us-gaap_PropertyInsuranceProductLineMember
/ us-gaap_StatementBusinessSegmentsAxis
= ace_SegmentInsuranceNorthAmericanPcMember
Insurance - North American P&C | Casualty Insurance Product Line [Member]                      
Segment Reporting Information [Line Items]                      
Net premiums earned                 4,032us-gaap_PremiumsEarnedNet
/ us-gaap_ProductOrServiceAxis
= ace_CasualtyInsuranceProductLineMember
/ us-gaap_StatementBusinessSegmentsAxis
= ace_SegmentInsuranceNorthAmericanPcMember
3,847us-gaap_PremiumsEarnedNet
/ us-gaap_ProductOrServiceAxis
= ace_CasualtyInsuranceProductLineMember
/ us-gaap_StatementBusinessSegmentsAxis
= ace_SegmentInsuranceNorthAmericanPcMember
3,406us-gaap_PremiumsEarnedNet
/ us-gaap_ProductOrServiceAxis
= ace_CasualtyInsuranceProductLineMember
/ us-gaap_StatementBusinessSegmentsAxis
= ace_SegmentInsuranceNorthAmericanPcMember
Insurance - North American P&C | Life Accident And Health Product Line [Member]                      
Segment Reporting Information [Line Items]                      
Net premiums earned                 413us-gaap_PremiumsEarnedNet
/ us-gaap_ProductOrServiceAxis
= ace_LifeAccidentAndHealthProductLineMember
/ us-gaap_StatementBusinessSegmentsAxis
= ace_SegmentInsuranceNorthAmericanPcMember
385us-gaap_PremiumsEarnedNet
/ us-gaap_ProductOrServiceAxis
= ace_LifeAccidentAndHealthProductLineMember
/ us-gaap_StatementBusinessSegmentsAxis
= ace_SegmentInsuranceNorthAmericanPcMember
371us-gaap_PremiumsEarnedNet
/ us-gaap_ProductOrServiceAxis
= ace_LifeAccidentAndHealthProductLineMember
/ us-gaap_StatementBusinessSegmentsAxis
= ace_SegmentInsuranceNorthAmericanPcMember
Insurance - North American Agriculture                      
Segment Reporting Information [Line Items]                      
Net premiums earned                 1,526us-gaap_PremiumsEarnedNet
/ us-gaap_StatementBusinessSegmentsAxis
= ace_SegmentInsuranceNorthAmericanAgricultureMember
1,678us-gaap_PremiumsEarnedNet
/ us-gaap_StatementBusinessSegmentsAxis
= ace_SegmentInsuranceNorthAmericanAgricultureMember
1,872us-gaap_PremiumsEarnedNet
/ us-gaap_StatementBusinessSegmentsAxis
= ace_SegmentInsuranceNorthAmericanAgricultureMember
Insurance - North American Agriculture | Property and all other                      
Segment Reporting Information [Line Items]                      
Net premiums earned                 1,526us-gaap_PremiumsEarnedNet
/ us-gaap_ProductOrServiceAxis
= us-gaap_PropertyInsuranceProductLineMember
/ us-gaap_StatementBusinessSegmentsAxis
= ace_SegmentInsuranceNorthAmericanAgricultureMember
1,678us-gaap_PremiumsEarnedNet
/ us-gaap_ProductOrServiceAxis
= us-gaap_PropertyInsuranceProductLineMember
/ us-gaap_StatementBusinessSegmentsAxis
= ace_SegmentInsuranceNorthAmericanAgricultureMember
1,872us-gaap_PremiumsEarnedNet
/ us-gaap_ProductOrServiceAxis
= us-gaap_PropertyInsuranceProductLineMember
/ us-gaap_StatementBusinessSegmentsAxis
= ace_SegmentInsuranceNorthAmericanAgricultureMember
Insurance - Overseas General                      
Segment Reporting Information [Line Items]                      
Net premiums earned                 6,805us-gaap_PremiumsEarnedNet
/ us-gaap_StatementBusinessSegmentsAxis
= ace_SegmentInsuranceOverseasGeneralMember
6,333us-gaap_PremiumsEarnedNet
/ us-gaap_StatementBusinessSegmentsAxis
= ace_SegmentInsuranceOverseasGeneralMember
5,740us-gaap_PremiumsEarnedNet
/ us-gaap_StatementBusinessSegmentsAxis
= ace_SegmentInsuranceOverseasGeneralMember
Insurance - Overseas General | Property and all other                      
Segment Reporting Information [Line Items]                      
Net premiums earned                 2,948us-gaap_PremiumsEarnedNet
/ us-gaap_ProductOrServiceAxis
= us-gaap_PropertyInsuranceProductLineMember
/ us-gaap_StatementBusinessSegmentsAxis
= ace_SegmentInsuranceOverseasGeneralMember
2,672us-gaap_PremiumsEarnedNet
/ us-gaap_ProductOrServiceAxis
= us-gaap_PropertyInsuranceProductLineMember
/ us-gaap_StatementBusinessSegmentsAxis
= ace_SegmentInsuranceOverseasGeneralMember
2,236us-gaap_PremiumsEarnedNet
/ us-gaap_ProductOrServiceAxis
= us-gaap_PropertyInsuranceProductLineMember
/ us-gaap_StatementBusinessSegmentsAxis
= ace_SegmentInsuranceOverseasGeneralMember
Insurance - Overseas General | Casualty Insurance Product Line [Member]                      
Segment Reporting Information [Line Items]                      
Net premiums earned                 1,573us-gaap_PremiumsEarnedNet
/ us-gaap_ProductOrServiceAxis
= ace_CasualtyInsuranceProductLineMember
/ us-gaap_StatementBusinessSegmentsAxis
= ace_SegmentInsuranceOverseasGeneralMember
1,479us-gaap_PremiumsEarnedNet
/ us-gaap_ProductOrServiceAxis
= ace_CasualtyInsuranceProductLineMember
/ us-gaap_StatementBusinessSegmentsAxis
= ace_SegmentInsuranceOverseasGeneralMember
1,379us-gaap_PremiumsEarnedNet
/ us-gaap_ProductOrServiceAxis
= ace_CasualtyInsuranceProductLineMember
/ us-gaap_StatementBusinessSegmentsAxis
= ace_SegmentInsuranceOverseasGeneralMember
Insurance - Overseas General | Life Accident And Health Product Line [Member]                      
Segment Reporting Information [Line Items]                      
Net premiums earned                 2,284us-gaap_PremiumsEarnedNet
/ us-gaap_ProductOrServiceAxis
= ace_LifeAccidentAndHealthProductLineMember
/ us-gaap_StatementBusinessSegmentsAxis
= ace_SegmentInsuranceOverseasGeneralMember
2,182us-gaap_PremiumsEarnedNet
/ us-gaap_ProductOrServiceAxis
= ace_LifeAccidentAndHealthProductLineMember
/ us-gaap_StatementBusinessSegmentsAxis
= ace_SegmentInsuranceOverseasGeneralMember
2,125us-gaap_PremiumsEarnedNet
/ us-gaap_ProductOrServiceAxis
= ace_LifeAccidentAndHealthProductLineMember
/ us-gaap_StatementBusinessSegmentsAxis
= ace_SegmentInsuranceOverseasGeneralMember
Global Reinsurance                      
Segment Reporting Information [Line Items]                      
Net premiums earned                 1,026us-gaap_PremiumsEarnedNet
/ us-gaap_StatementBusinessSegmentsAxis
= ace_SegmentGlobalReMember
976us-gaap_PremiumsEarnedNet
/ us-gaap_StatementBusinessSegmentsAxis
= ace_SegmentGlobalReMember
1,002us-gaap_PremiumsEarnedNet
/ us-gaap_StatementBusinessSegmentsAxis
= ace_SegmentGlobalReMember
Global Reinsurance | Property and all other                      
Segment Reporting Information [Line Items]                      
Net premiums earned                 551us-gaap_PremiumsEarnedNet
/ us-gaap_ProductOrServiceAxis
= us-gaap_PropertyInsuranceProductLineMember
/ us-gaap_StatementBusinessSegmentsAxis
= ace_SegmentGlobalReMember
543us-gaap_PremiumsEarnedNet
/ us-gaap_ProductOrServiceAxis
= us-gaap_PropertyInsuranceProductLineMember
/ us-gaap_StatementBusinessSegmentsAxis
= ace_SegmentGlobalReMember
495us-gaap_PremiumsEarnedNet
/ us-gaap_ProductOrServiceAxis
= us-gaap_PropertyInsuranceProductLineMember
/ us-gaap_StatementBusinessSegmentsAxis
= ace_SegmentGlobalReMember
Global Reinsurance | Casualty Insurance Product Line [Member]                      
Segment Reporting Information [Line Items]                      
Net premiums earned                 475us-gaap_PremiumsEarnedNet
/ us-gaap_ProductOrServiceAxis
= ace_CasualtyInsuranceProductLineMember
/ us-gaap_StatementBusinessSegmentsAxis
= ace_SegmentGlobalReMember
433us-gaap_PremiumsEarnedNet
/ us-gaap_ProductOrServiceAxis
= ace_CasualtyInsuranceProductLineMember
/ us-gaap_StatementBusinessSegmentsAxis
= ace_SegmentGlobalReMember
507us-gaap_PremiumsEarnedNet
/ us-gaap_ProductOrServiceAxis
= ace_CasualtyInsuranceProductLineMember
/ us-gaap_StatementBusinessSegmentsAxis
= ace_SegmentGlobalReMember
Life                      
Segment Reporting Information [Line Items]                      
Net premiums earned                 1,962us-gaap_PremiumsEarnedNet
/ us-gaap_StatementBusinessSegmentsAxis
= ace_SegmentLifeMember
1,905us-gaap_PremiumsEarnedNet
/ us-gaap_StatementBusinessSegmentsAxis
= ace_SegmentLifeMember
1,916us-gaap_PremiumsEarnedNet
/ us-gaap_StatementBusinessSegmentsAxis
= ace_SegmentLifeMember
Life | Property and all other                      
Segment Reporting Information [Line Items]                      
Net premiums earned                 0us-gaap_PremiumsEarnedNet
/ us-gaap_ProductOrServiceAxis
= us-gaap_PropertyInsuranceProductLineMember
/ us-gaap_StatementBusinessSegmentsAxis
= ace_SegmentLifeMember
0us-gaap_PremiumsEarnedNet
/ us-gaap_ProductOrServiceAxis
= us-gaap_PropertyInsuranceProductLineMember
/ us-gaap_StatementBusinessSegmentsAxis
= ace_SegmentLifeMember
0us-gaap_PremiumsEarnedNet
/ us-gaap_ProductOrServiceAxis
= us-gaap_PropertyInsuranceProductLineMember
/ us-gaap_StatementBusinessSegmentsAxis
= ace_SegmentLifeMember
Life | Casualty Insurance Product Line [Member]                      
Segment Reporting Information [Line Items]                      
Net premiums earned                 0us-gaap_PremiumsEarnedNet
/ us-gaap_ProductOrServiceAxis
= ace_CasualtyInsuranceProductLineMember
/ us-gaap_StatementBusinessSegmentsAxis
= ace_SegmentLifeMember
0us-gaap_PremiumsEarnedNet
/ us-gaap_ProductOrServiceAxis
= ace_CasualtyInsuranceProductLineMember
/ us-gaap_StatementBusinessSegmentsAxis
= ace_SegmentLifeMember
0us-gaap_PremiumsEarnedNet
/ us-gaap_ProductOrServiceAxis
= ace_CasualtyInsuranceProductLineMember
/ us-gaap_StatementBusinessSegmentsAxis
= ace_SegmentLifeMember
Life | Life Accident And Health Product Line [Member]                      
Segment Reporting Information [Line Items]                      
Net premiums earned                 $ 1,962us-gaap_PremiumsEarnedNet
/ us-gaap_ProductOrServiceAxis
= ace_LifeAccidentAndHealthProductLineMember
/ us-gaap_StatementBusinessSegmentsAxis
= ace_SegmentLifeMember
$ 1,905us-gaap_PremiumsEarnedNet
/ us-gaap_ProductOrServiceAxis
= ace_LifeAccidentAndHealthProductLineMember
/ us-gaap_StatementBusinessSegmentsAxis
= ace_SegmentLifeMember
$ 1,916us-gaap_PremiumsEarnedNet
/ us-gaap_ProductOrServiceAxis
= ace_LifeAccidentAndHealthProductLineMember
/ us-gaap_StatementBusinessSegmentsAxis
= ace_SegmentLifeMember