XML 69 R58.htm IDEA: XBRL DOCUMENT
v3.10.0.1

Commitments, Contingencies, And Guarantees (Balance Sheet Locations, Fair Values In Asset Or (Liability) Position, And Notional Values/Payment Provisions Of Derivative Instruments) (Detail) - USD ($) $ in Millions | Sep. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Foreign currency forward contracts |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Notional Value/Payment Provision |  | $ 2,189 | $ 2,064
Cross-currency swaps |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Notional Value/Payment Provision |  | 45 | 45
Interest Rate Swap [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Notional Value/Payment Provision |  | 5,000 | 0
Options/Futures contracts on notes and bonds |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Notional Value/Payment Provision |  | 1,181 | 1,007
Convertible securities |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Notional Value/Payment Provision | [1] | 13 | 6
Total investment and embedded derivative instruments |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Notional Value/Payment Provision |  | 8,428 | 3,122
Fair Value, Asset |  | 67 | 23
Futures contracts on equities (2) |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Notional Value/Payment Provision | [2] | 1,095 | 1,553
Other |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Notional Value/Payment Provision |  | 389 | 75
Other Derivative Instruments [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Notional Value/Payment Provision |  | 1,484 | 1,628
Guaranteed Minimum Income Benefit [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Notional Value/Payment Provision | [3] | 1,104 | 1,083
Fair Value, Asset | [3] | 0 | 0
Fixed Maturities [Member] | Convertible securities |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Fair Value, Asset | [1] | 12 | 5
Equity [Member] | Convertible securities |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Fair Value, Liability | [1] | 0 | 0
Other Assets [Member] | Foreign currency forward contracts |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Fair Value, Asset |  | 19 | 14
Other Assets [Member] | Cross-currency swaps |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Fair Value, Asset |  | 0 | 0
Other Assets [Member] | Interest Rate Swap [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Fair Value, Asset |  | 26 | 0
Other Assets [Member] | Options/Futures contracts on notes and bonds |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Fair Value, Asset |  | 10 | 4
Other Assets [Member] | Futures contracts on equities (2) |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Fair Value, Asset | [2] | 0 | 0
Other Assets [Member] | Other |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Fair Value, Asset |  | 5 | 1
Other Assets [Member] | Other Derivative Instruments [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Fair Value, Asset |  | 5 | 1
Accounts Payable, Accrued Expenses, And Other Liabilities [Member] | Foreign currency forward contracts |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Fair Value, Liability |  | (17) | (27)
Accounts Payable, Accrued Expenses, And Other Liabilities [Member] | Cross-currency swaps |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Fair Value, Liability |  | 0 | 0
Accounts Payable, Accrued Expenses, And Other Liabilities [Member] | Interest Rate Swap [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Fair Value, Liability |  | 0 | 0
Accounts Payable, Accrued Expenses, And Other Liabilities [Member] | Options/Futures contracts on notes and bonds |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Fair Value, Liability |  | (7) | (3)
Accounts Payable, Accrued Expenses, And Other Liabilities [Member] | Total investment and embedded derivative instruments |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Fair Value, Liability |  | (24) | (30)
Accounts Payable, Accrued Expenses, And Other Liabilities [Member] | Futures contracts on equities (2) |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Fair Value, Liability | [2] | (7) | (21)
Accounts Payable, Accrued Expenses, And Other Liabilities [Member] | Other |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Fair Value, Liability |  | (2) | (2)
Accounts Payable, Accrued Expenses, And Other Liabilities [Member] | Other Derivative Instruments [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Fair Value, Liability |  | (9) | (23)
Balance Sheet Location Accounts Payable Future Policy Benefits [Member] | Guaranteed Minimum Income Benefit [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Fair Value, Liability | [3] | $ (453) | $ (550)
[1] | Includes fair value of embedded derivatives.
[2] | Related to GMDB and GLB blocks of business.
[3] | Includes both future policy benefits reserves and fair value derivative adjustment. Note that the payment provision related to GLB is the net amount at risk. The concept of a notional value does not apply to the GLB reinsurance contracts.

X
- Definition Aggregate notional amount specified by the derivative(s). Expressed as an absolute value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 -Section 13 -Sentence Column B + Details
Name: | invest_DerivativeNotionalAmount
Namespace Prefix: | invest_
Data Type: | xbrli:monetaryItemType
Balance Type: | na
Period Type: | instant

X
- Definition Fair value of liability associated with financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4B -Subparagraph (a),(c) -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5624163-113959 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=99393222&loc=SL20226003-175313 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312 + Details
Name: | us-gaap_DerivativeAssetFairValueGrossLiability
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Fair value, before effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes liabilities elected not to be offset. Excludes liabilities not subject to a master netting arrangement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 20 -Section 50 -Paragraph 4D -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=109247956&loc=SL51823488-111719 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4B -Subparagraph (a),(c) -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5624163-113959 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=99393222&loc=SL20226000-175313 + Details
Name: | us-gaap_DerivativeFairValueOfDerivativeLiability
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_DerivativesFairValueLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_DerivativeInstrumentRiskAxis=us-gaap_ForeignExchangeFutureMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DerivativeInstrumentRiskAxis=us-gaap_CurrencySwapMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DerivativeInstrumentRiskAxis=us-gaap_InterestRateSwapMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DerivativeInstrumentRiskAxis=us-gaap_FutureMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DerivativeInstrumentRiskAxis=us-gaap_ConvertiblesAndBondsWithWarrantsAttachedMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DerivativeInstrumentRiskAxis=cb_InvestmentAndEmbeddedDerivativeInstrumentsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DerivativeInstrumentRiskAxis=us-gaap_SingleStockFutureMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DerivativeInstrumentRiskAxis=cb_OtherDerivativesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DerivativeInstrumentRiskAxis=cb_OtherDerivativesTotalMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DerivativeInstrumentRiskAxis=us-gaap_GuaranteedMinimumIncomeBenefitMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_BalanceSheetLocationAxis=us-gaap_FixedMaturitiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_BalanceSheetLocationAxis=us-gaap_EquityMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_BalanceSheetLocationAxis=us-gaap_OtherAssetsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_BalanceSheetLocationAxis=us-gaap_AccountsPayableAndAccruedLiabilitiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_BalanceSheetLocationAxis=cb_BalanceSheetLocationAccountsPayableFuturePolicyBenefitsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |