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Investments (Schedule Of Amortized Cost And Fair Value Of Fixed Maturities And Related Other-Than-Temporary Impairment Recognized In Accumulated Other Comprehensive Income) (Detail) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Investment [Line Items]    
Available for sale, Amortized Cost $ 47,826us-gaap_AvailableForSaleSecuritiesAmortizedCost $ 48,406us-gaap_AvailableForSaleSecuritiesAmortizedCost
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax 1,871us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainBeforeTax 1,465us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainBeforeTax
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax (302)us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedLossBeforeTax (617)us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedLossBeforeTax
Available for sale, Fair Value 49,395us-gaap_AvailableForSaleSecuritiesDebtSecurities 49,254us-gaap_AvailableForSaleSecuritiesDebtSecurities
Available for sale, OTTI recognized in AOCI (8)us-gaap_AccumulatedOtherComprehensiveIncomeLossOtherThanTemporaryImpairmentNotCreditLossNetOfTaxAvailableforsaleDebtSecurities (40)us-gaap_AccumulatedOtherComprehensiveIncomeLossOtherThanTemporaryImpairmentNotCreditLossNetOfTaxAvailableforsaleDebtSecurities
Held to maturity, Amortized Cost 7,331us-gaap_HeldToMaturitySecurities 6,098us-gaap_HeldToMaturitySecurities
Held-to-maturity Securities, Accumulated Unrecognized Holding Gain 266us-gaap_HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingGain 187us-gaap_HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingGain
Held-to-maturity Securities, Accumulated Unrecognized Holding Loss (8)us-gaap_HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingLoss (22)us-gaap_HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingLoss
Held to maturity, Fair Value 7,589us-gaap_HeldToMaturitySecuritiesFairValue 6,263us-gaap_HeldToMaturitySecuritiesFairValue
U.S. Treasury and agency    
Investment [Line Items]    
Available for sale, Amortized Cost 2,741us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ ace_FixedMaturitiesAndEquitiesAxis
= us-gaap_USTreasuryAndGovernmentMember
2,946us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ ace_FixedMaturitiesAndEquitiesAxis
= us-gaap_USTreasuryAndGovernmentMember
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax 87us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainBeforeTax
/ ace_FixedMaturitiesAndEquitiesAxis
= us-gaap_USTreasuryAndGovernmentMember
62us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainBeforeTax
/ ace_FixedMaturitiesAndEquitiesAxis
= us-gaap_USTreasuryAndGovernmentMember
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax (8)us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedLossBeforeTax
/ ace_FixedMaturitiesAndEquitiesAxis
= us-gaap_USTreasuryAndGovernmentMember
(59)us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedLossBeforeTax
/ ace_FixedMaturitiesAndEquitiesAxis
= us-gaap_USTreasuryAndGovernmentMember
Available for sale, Fair Value 2,820us-gaap_AvailableForSaleSecuritiesDebtSecurities
/ ace_FixedMaturitiesAndEquitiesAxis
= us-gaap_USTreasuryAndGovernmentMember
2,949us-gaap_AvailableForSaleSecuritiesDebtSecurities
/ ace_FixedMaturitiesAndEquitiesAxis
= us-gaap_USTreasuryAndGovernmentMember
Available for sale, OTTI recognized in AOCI 0us-gaap_AccumulatedOtherComprehensiveIncomeLossOtherThanTemporaryImpairmentNotCreditLossNetOfTaxAvailableforsaleDebtSecurities
/ ace_FixedMaturitiesAndEquitiesAxis
= us-gaap_USTreasuryAndGovernmentMember
0us-gaap_AccumulatedOtherComprehensiveIncomeLossOtherThanTemporaryImpairmentNotCreditLossNetOfTaxAvailableforsaleDebtSecurities
/ ace_FixedMaturitiesAndEquitiesAxis
= us-gaap_USTreasuryAndGovernmentMember
Held to maturity, Amortized Cost 832us-gaap_HeldToMaturitySecurities
/ ace_FixedMaturitiesAndEquitiesAxis
= us-gaap_USTreasuryAndGovernmentMember
820us-gaap_HeldToMaturitySecurities
/ ace_FixedMaturitiesAndEquitiesAxis
= us-gaap_USTreasuryAndGovernmentMember
Held-to-maturity Securities, Accumulated Unrecognized Holding Gain 20us-gaap_HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingGain
/ ace_FixedMaturitiesAndEquitiesAxis
= us-gaap_USTreasuryAndGovernmentMember
16us-gaap_HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingGain
/ ace_FixedMaturitiesAndEquitiesAxis
= us-gaap_USTreasuryAndGovernmentMember
Held-to-maturity Securities, Accumulated Unrecognized Holding Loss (2)us-gaap_HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingLoss
/ ace_FixedMaturitiesAndEquitiesAxis
= us-gaap_USTreasuryAndGovernmentMember
(4)us-gaap_HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingLoss
/ ace_FixedMaturitiesAndEquitiesAxis
= us-gaap_USTreasuryAndGovernmentMember
Held to maturity, Fair Value 850us-gaap_HeldToMaturitySecuritiesFairValue
/ ace_FixedMaturitiesAndEquitiesAxis
= us-gaap_USTreasuryAndGovernmentMember
832us-gaap_HeldToMaturitySecuritiesFairValue
/ ace_FixedMaturitiesAndEquitiesAxis
= us-gaap_USTreasuryAndGovernmentMember
Held to maturity, OTTI recognized in AOCI 0us-gaap_AccumulatedOtherComprehensiveIncomeLossOtherThanTemporaryImpairmentNotCreditLossNetOfTaxHeldtomaturityDebtSecurities
/ ace_FixedMaturitiesAndEquitiesAxis
= us-gaap_USTreasuryAndGovernmentMember
0us-gaap_AccumulatedOtherComprehensiveIncomeLossOtherThanTemporaryImpairmentNotCreditLossNetOfTaxHeldtomaturityDebtSecurities
/ ace_FixedMaturitiesAndEquitiesAxis
= us-gaap_USTreasuryAndGovernmentMember
Foreign    
Investment [Line Items]    
Available for sale, Amortized Cost 14,703us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ ace_FixedMaturitiesAndEquitiesAxis
= us-gaap_ForeignGovernmentDebtSecuritiesMember
14,336us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ ace_FixedMaturitiesAndEquitiesAxis
= us-gaap_ForeignGovernmentDebtSecuritiesMember
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax 629us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainBeforeTax
/ ace_FixedMaturitiesAndEquitiesAxis
= us-gaap_ForeignGovernmentDebtSecuritiesMember
377us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainBeforeTax
/ ace_FixedMaturitiesAndEquitiesAxis
= us-gaap_ForeignGovernmentDebtSecuritiesMember
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax (90)us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedLossBeforeTax
/ ace_FixedMaturitiesAndEquitiesAxis
= us-gaap_ForeignGovernmentDebtSecuritiesMember
(122)us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedLossBeforeTax
/ ace_FixedMaturitiesAndEquitiesAxis
= us-gaap_ForeignGovernmentDebtSecuritiesMember
Available for sale, Fair Value 15,242us-gaap_AvailableForSaleSecuritiesDebtSecurities
/ ace_FixedMaturitiesAndEquitiesAxis
= us-gaap_ForeignGovernmentDebtSecuritiesMember
14,591us-gaap_AvailableForSaleSecuritiesDebtSecurities
/ ace_FixedMaturitiesAndEquitiesAxis
= us-gaap_ForeignGovernmentDebtSecuritiesMember
Available for sale, OTTI recognized in AOCI 0us-gaap_AccumulatedOtherComprehensiveIncomeLossOtherThanTemporaryImpairmentNotCreditLossNetOfTaxAvailableforsaleDebtSecurities
/ ace_FixedMaturitiesAndEquitiesAxis
= us-gaap_ForeignGovernmentDebtSecuritiesMember
0us-gaap_AccumulatedOtherComprehensiveIncomeLossOtherThanTemporaryImpairmentNotCreditLossNetOfTaxAvailableforsaleDebtSecurities
/ ace_FixedMaturitiesAndEquitiesAxis
= us-gaap_ForeignGovernmentDebtSecuritiesMember
Held to maturity, Amortized Cost 916us-gaap_HeldToMaturitySecurities
/ ace_FixedMaturitiesAndEquitiesAxis
= us-gaap_ForeignGovernmentDebtSecuritiesMember
864us-gaap_HeldToMaturitySecurities
/ ace_FixedMaturitiesAndEquitiesAxis
= us-gaap_ForeignGovernmentDebtSecuritiesMember
Held-to-maturity Securities, Accumulated Unrecognized Holding Gain 47us-gaap_HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingGain
/ ace_FixedMaturitiesAndEquitiesAxis
= us-gaap_ForeignGovernmentDebtSecuritiesMember
33us-gaap_HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingGain
/ ace_FixedMaturitiesAndEquitiesAxis
= us-gaap_ForeignGovernmentDebtSecuritiesMember
Held-to-maturity Securities, Accumulated Unrecognized Holding Loss 0us-gaap_HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingLoss
/ ace_FixedMaturitiesAndEquitiesAxis
= us-gaap_ForeignGovernmentDebtSecuritiesMember
0us-gaap_HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingLoss
/ ace_FixedMaturitiesAndEquitiesAxis
= us-gaap_ForeignGovernmentDebtSecuritiesMember
Held to maturity, Fair Value 963us-gaap_HeldToMaturitySecuritiesFairValue
/ ace_FixedMaturitiesAndEquitiesAxis
= us-gaap_ForeignGovernmentDebtSecuritiesMember
897us-gaap_HeldToMaturitySecuritiesFairValue
/ ace_FixedMaturitiesAndEquitiesAxis
= us-gaap_ForeignGovernmentDebtSecuritiesMember
Held to maturity, OTTI recognized in AOCI 0us-gaap_AccumulatedOtherComprehensiveIncomeLossOtherThanTemporaryImpairmentNotCreditLossNetOfTaxHeldtomaturityDebtSecurities
/ ace_FixedMaturitiesAndEquitiesAxis
= us-gaap_ForeignGovernmentDebtSecuritiesMember
0us-gaap_AccumulatedOtherComprehensiveIncomeLossOtherThanTemporaryImpairmentNotCreditLossNetOfTaxHeldtomaturityDebtSecurities
/ ace_FixedMaturitiesAndEquitiesAxis
= us-gaap_ForeignGovernmentDebtSecuritiesMember
Corporate securities    
Investment [Line Items]    
Available for sale, Amortized Cost 16,897us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ ace_FixedMaturitiesAndEquitiesAxis
= us-gaap_CorporateDebtSecuritiesMember
16,825us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ ace_FixedMaturitiesAndEquitiesAxis
= us-gaap_CorporateDebtSecuritiesMember
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax 704us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainBeforeTax
/ ace_FixedMaturitiesAndEquitiesAxis
= us-gaap_CorporateDebtSecuritiesMember
777us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainBeforeTax
/ ace_FixedMaturitiesAndEquitiesAxis
= us-gaap_CorporateDebtSecuritiesMember
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax (170)us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedLossBeforeTax
/ ace_FixedMaturitiesAndEquitiesAxis
= us-gaap_CorporateDebtSecuritiesMember
(132)us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedLossBeforeTax
/ ace_FixedMaturitiesAndEquitiesAxis
= us-gaap_CorporateDebtSecuritiesMember
Available for sale, Fair Value 17,431us-gaap_AvailableForSaleSecuritiesDebtSecurities
/ ace_FixedMaturitiesAndEquitiesAxis
= us-gaap_CorporateDebtSecuritiesMember
17,470us-gaap_AvailableForSaleSecuritiesDebtSecurities
/ ace_FixedMaturitiesAndEquitiesAxis
= us-gaap_CorporateDebtSecuritiesMember
Available for sale, OTTI recognized in AOCI (7)us-gaap_AccumulatedOtherComprehensiveIncomeLossOtherThanTemporaryImpairmentNotCreditLossNetOfTaxAvailableforsaleDebtSecurities
/ ace_FixedMaturitiesAndEquitiesAxis
= us-gaap_CorporateDebtSecuritiesMember
(6)us-gaap_AccumulatedOtherComprehensiveIncomeLossOtherThanTemporaryImpairmentNotCreditLossNetOfTaxAvailableforsaleDebtSecurities
/ ace_FixedMaturitiesAndEquitiesAxis
= us-gaap_CorporateDebtSecuritiesMember
Held to maturity, Amortized Cost 2,323us-gaap_HeldToMaturitySecurities
/ ace_FixedMaturitiesAndEquitiesAxis
= us-gaap_CorporateDebtSecuritiesMember
1,922us-gaap_HeldToMaturitySecurities
/ ace_FixedMaturitiesAndEquitiesAxis
= us-gaap_CorporateDebtSecuritiesMember
Held-to-maturity Securities, Accumulated Unrecognized Holding Gain 102us-gaap_HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingGain
/ ace_FixedMaturitiesAndEquitiesAxis
= us-gaap_CorporateDebtSecuritiesMember
83us-gaap_HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingGain
/ ace_FixedMaturitiesAndEquitiesAxis
= us-gaap_CorporateDebtSecuritiesMember
Held-to-maturity Securities, Accumulated Unrecognized Holding Loss (2)us-gaap_HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingLoss
/ ace_FixedMaturitiesAndEquitiesAxis
= us-gaap_CorporateDebtSecuritiesMember
0us-gaap_HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingLoss
/ ace_FixedMaturitiesAndEquitiesAxis
= us-gaap_CorporateDebtSecuritiesMember
Held to maturity, Fair Value 2,423us-gaap_HeldToMaturitySecuritiesFairValue
/ ace_FixedMaturitiesAndEquitiesAxis
= us-gaap_CorporateDebtSecuritiesMember
2,005us-gaap_HeldToMaturitySecuritiesFairValue
/ ace_FixedMaturitiesAndEquitiesAxis
= us-gaap_CorporateDebtSecuritiesMember
Held to maturity, OTTI recognized in AOCI 0us-gaap_AccumulatedOtherComprehensiveIncomeLossOtherThanTemporaryImpairmentNotCreditLossNetOfTaxHeldtomaturityDebtSecurities
/ ace_FixedMaturitiesAndEquitiesAxis
= us-gaap_CorporateDebtSecuritiesMember
0us-gaap_AccumulatedOtherComprehensiveIncomeLossOtherThanTemporaryImpairmentNotCreditLossNetOfTaxHeldtomaturityDebtSecurities
/ ace_FixedMaturitiesAndEquitiesAxis
= us-gaap_CorporateDebtSecuritiesMember
Mortgage backed-securities    
Investment [Line Items]    
Available for sale, Amortized Cost 10,011us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ ace_FixedMaturitiesAndEquitiesAxis
= us-gaap_MortgageBackedSecuritiesMember
10,937us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ ace_FixedMaturitiesAndEquitiesAxis
= us-gaap_MortgageBackedSecuritiesMember
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax 304us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainBeforeTax
/ ace_FixedMaturitiesAndEquitiesAxis
= us-gaap_MortgageBackedSecuritiesMember
184us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainBeforeTax
/ ace_FixedMaturitiesAndEquitiesAxis
= us-gaap_MortgageBackedSecuritiesMember
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax (29)us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedLossBeforeTax
/ ace_FixedMaturitiesAndEquitiesAxis
= us-gaap_MortgageBackedSecuritiesMember
(227)us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedLossBeforeTax
/ ace_FixedMaturitiesAndEquitiesAxis
= us-gaap_MortgageBackedSecuritiesMember
Available for sale, Fair Value 10,286us-gaap_AvailableForSaleSecuritiesDebtSecurities
/ ace_FixedMaturitiesAndEquitiesAxis
= us-gaap_MortgageBackedSecuritiesMember
10,894us-gaap_AvailableForSaleSecuritiesDebtSecurities
/ ace_FixedMaturitiesAndEquitiesAxis
= us-gaap_MortgageBackedSecuritiesMember
Available for sale, OTTI recognized in AOCI (1)us-gaap_AccumulatedOtherComprehensiveIncomeLossOtherThanTemporaryImpairmentNotCreditLossNetOfTaxAvailableforsaleDebtSecurities
/ ace_FixedMaturitiesAndEquitiesAxis
= us-gaap_MortgageBackedSecuritiesMember
(34)us-gaap_AccumulatedOtherComprehensiveIncomeLossOtherThanTemporaryImpairmentNotCreditLossNetOfTaxAvailableforsaleDebtSecurities
/ ace_FixedMaturitiesAndEquitiesAxis
= us-gaap_MortgageBackedSecuritiesMember
Held to maturity, Amortized Cost 1,983us-gaap_HeldToMaturitySecurities
/ ace_FixedMaturitiesAndEquitiesAxis
= us-gaap_MortgageBackedSecuritiesMember
1,341us-gaap_HeldToMaturitySecurities
/ ace_FixedMaturitiesAndEquitiesAxis
= us-gaap_MortgageBackedSecuritiesMember
Held-to-maturity Securities, Accumulated Unrecognized Holding Gain 57us-gaap_HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingGain
/ ace_FixedMaturitiesAndEquitiesAxis
= us-gaap_MortgageBackedSecuritiesMember
39us-gaap_HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingGain
/ ace_FixedMaturitiesAndEquitiesAxis
= us-gaap_MortgageBackedSecuritiesMember
Held-to-maturity Securities, Accumulated Unrecognized Holding Loss (1)us-gaap_HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingLoss
/ ace_FixedMaturitiesAndEquitiesAxis
= us-gaap_MortgageBackedSecuritiesMember
(1)us-gaap_HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingLoss
/ ace_FixedMaturitiesAndEquitiesAxis
= us-gaap_MortgageBackedSecuritiesMember
Held to maturity, Fair Value 2,039us-gaap_HeldToMaturitySecuritiesFairValue
/ ace_FixedMaturitiesAndEquitiesAxis
= us-gaap_MortgageBackedSecuritiesMember
1,379us-gaap_HeldToMaturitySecuritiesFairValue
/ ace_FixedMaturitiesAndEquitiesAxis
= us-gaap_MortgageBackedSecuritiesMember
Held to maturity, OTTI recognized in AOCI 0us-gaap_AccumulatedOtherComprehensiveIncomeLossOtherThanTemporaryImpairmentNotCreditLossNetOfTaxHeldtomaturityDebtSecurities
/ ace_FixedMaturitiesAndEquitiesAxis
= us-gaap_MortgageBackedSecuritiesMember
0us-gaap_AccumulatedOtherComprehensiveIncomeLossOtherThanTemporaryImpairmentNotCreditLossNetOfTaxHeldtomaturityDebtSecurities
/ ace_FixedMaturitiesAndEquitiesAxis
= us-gaap_MortgageBackedSecuritiesMember
States, municipalities, and political subdivisions    
Investment [Line Items]    
Available for sale, Amortized Cost 3,474us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ ace_FixedMaturitiesAndEquitiesAxis
= us-gaap_USStatesAndPoliticalSubdivisionsMember
3,362us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ ace_FixedMaturitiesAndEquitiesAxis
= us-gaap_USStatesAndPoliticalSubdivisionsMember
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax 147us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainBeforeTax
/ ace_FixedMaturitiesAndEquitiesAxis
= us-gaap_USStatesAndPoliticalSubdivisionsMember
65us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainBeforeTax
/ ace_FixedMaturitiesAndEquitiesAxis
= us-gaap_USStatesAndPoliticalSubdivisionsMember
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax (5)us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedLossBeforeTax
/ ace_FixedMaturitiesAndEquitiesAxis
= us-gaap_USStatesAndPoliticalSubdivisionsMember
(77)us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedLossBeforeTax
/ ace_FixedMaturitiesAndEquitiesAxis
= us-gaap_USStatesAndPoliticalSubdivisionsMember
Available for sale, Fair Value 3,616us-gaap_AvailableForSaleSecuritiesDebtSecurities
/ ace_FixedMaturitiesAndEquitiesAxis
= us-gaap_USStatesAndPoliticalSubdivisionsMember
3,350us-gaap_AvailableForSaleSecuritiesDebtSecurities
/ ace_FixedMaturitiesAndEquitiesAxis
= us-gaap_USStatesAndPoliticalSubdivisionsMember
Available for sale, OTTI recognized in AOCI 0us-gaap_AccumulatedOtherComprehensiveIncomeLossOtherThanTemporaryImpairmentNotCreditLossNetOfTaxAvailableforsaleDebtSecurities
/ ace_FixedMaturitiesAndEquitiesAxis
= us-gaap_USStatesAndPoliticalSubdivisionsMember
0us-gaap_AccumulatedOtherComprehensiveIncomeLossOtherThanTemporaryImpairmentNotCreditLossNetOfTaxAvailableforsaleDebtSecurities
/ ace_FixedMaturitiesAndEquitiesAxis
= us-gaap_USStatesAndPoliticalSubdivisionsMember
Held to maturity, Amortized Cost 1,277us-gaap_HeldToMaturitySecurities
/ ace_FixedMaturitiesAndEquitiesAxis
= us-gaap_USStatesAndPoliticalSubdivisionsMember
1,151us-gaap_HeldToMaturitySecurities
/ ace_FixedMaturitiesAndEquitiesAxis
= us-gaap_USStatesAndPoliticalSubdivisionsMember
Held-to-maturity Securities, Accumulated Unrecognized Holding Gain 40us-gaap_HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingGain
/ ace_FixedMaturitiesAndEquitiesAxis
= us-gaap_USStatesAndPoliticalSubdivisionsMember
16us-gaap_HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingGain
/ ace_FixedMaturitiesAndEquitiesAxis
= us-gaap_USStatesAndPoliticalSubdivisionsMember
Held-to-maturity Securities, Accumulated Unrecognized Holding Loss (3)us-gaap_HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingLoss
/ ace_FixedMaturitiesAndEquitiesAxis
= us-gaap_USStatesAndPoliticalSubdivisionsMember
(17)us-gaap_HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingLoss
/ ace_FixedMaturitiesAndEquitiesAxis
= us-gaap_USStatesAndPoliticalSubdivisionsMember
Held to maturity, Fair Value 1,314us-gaap_HeldToMaturitySecuritiesFairValue
/ ace_FixedMaturitiesAndEquitiesAxis
= us-gaap_USStatesAndPoliticalSubdivisionsMember
1,150us-gaap_HeldToMaturitySecuritiesFairValue
/ ace_FixedMaturitiesAndEquitiesAxis
= us-gaap_USStatesAndPoliticalSubdivisionsMember
Held to maturity, OTTI recognized in AOCI $ 0us-gaap_AccumulatedOtherComprehensiveIncomeLossOtherThanTemporaryImpairmentNotCreditLossNetOfTaxHeldtomaturityDebtSecurities
/ ace_FixedMaturitiesAndEquitiesAxis
= us-gaap_USStatesAndPoliticalSubdivisionsMember
$ 0us-gaap_AccumulatedOtherComprehensiveIncomeLossOtherThanTemporaryImpairmentNotCreditLossNetOfTaxHeldtomaturityDebtSecurities
/ ace_FixedMaturitiesAndEquitiesAxis
= us-gaap_USStatesAndPoliticalSubdivisionsMember