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 |