XML 79 R64.htm IDEA: XBRL DOCUMENT
v3.10.0.1

Investments (Schedule Of Investments In Partially-Owned Insurance Companies) (Details) - USD ($) $ in Millions | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Investment [Line Items] |  |
Carrying Value | $ 678 | $ 662
Issued Share Capital | 1,864 | 1,942
Huatai Group | CHINA |  |
Investment [Line Items] |  |
Carrying Value | 452 | 438
Issued Share Capital | $ 587 | $ 616
Ownership Percentage | 20.00% | 20.00%
Huatai Life Insurance Company | CHINA |  |
Investment [Line Items] |  |
Carrying Value | $ 106 | $ 105
Issued Share Capital | $ 472 | $ 495
Ownership Percentage | 20.00% | 20.00%
Freisenbruch-Meyer | Bermuda |  |
Investment [Line Items] |  |
Carrying Value | $ 9 | $ 9
Issued Share Capital | $ 0 | $ 0
Ownership Percentage | 40.00% | 40.00%
Russian Reinsurance Company | Russia |  |
Investment [Line Items] |  |
Carrying Value | $ 2 | $ 2
Issued Share Capital | $ 4 | $ 4
Ownership Percentage | 23.00% | 23.00%
ABR Reinsurance Capital Holdings Ltd. [Member] | Bermuda |  |
Investment [Line Items] |  |
Carrying Value | $ 91 | $ 93
Issued Share Capital | $ 774 | $ 800
Ownership Percentage | 12.00% | 11.00%
Chubb Arabia Cooperative Insurance Company [Member] | Saudi Arabia |  |
Investment [Line Items] |  |
Carrying Value | $ 18 | $ 15
Issued Share Capital | $ 27 | $ 27
Ownership Percentage | 30.00% | 30.00%

X
- Definition Line items represent reporting 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 Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 -Section 12 -Sentence Column A + Details
Name: | invest_InvestmentLineItems
Namespace Prefix: | invest_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Cost to investors of each class of capital shares or other capital units. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 946 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.6-04.16(b)(1)) -URI http://asc.fasb.org/extlink&oid=6488278&loc=d3e603758-122996 + Details
Name: | us-gaap_CapitalUnitsTotalCostToInvestors
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=114001798&loc=d3e33918-111571 + Details
Name: | us-gaap_EquityMethodInvestmentOwnershipPercentage
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Amount of investment in equity method investee and investment in and advance to affiliate. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.12) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
Name: | us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Details
Name: | dei_LegalEntityAxis=cb_HuataiInsuranceCompanyMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_StatementGeographicalAxis=country_CN
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | dei_LegalEntityAxis=cb_HuataiLifeInsuranceCompanyMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | dei_LegalEntityAxis=cb_FreisenbruchMeyerMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_StatementGeographicalAxis=country_BM
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | dei_LegalEntityAxis=cb_RussianReinsuranceCompanyMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_StatementGeographicalAxis=country_RU
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | dei_LegalEntityAxis=cb_ABRReinsuranceCapitalHoldingsLtd.Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | dei_LegalEntityAxis=cb_ChubbArabiaCooperativeInsuranceCompanyMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_StatementGeographicalAxis=country_SA
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |