XML 57 R44.htm IDEA: XBRL DOCUMENT
v3.24.2

General and significant accounting policies (Narrative) (Details) - USD ($) $ in Millions | Jun. 30, 2024 | May 15, 2024 | Mar. 07, 2024 | Dec. 31, 2023 | Jul. 01, 2023
--- | --- | --- | --- | --- | ---
INA Senior Notes Due March 2034 [Domain] | Senior Notes [Member] |  |  |  |  |
General and significant accounting policies [Line Items] |  |  |  |  |
Debt Instrument, Face Amount |  |  | $ 1,000 |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  | 5.00% |  |
Make Whole Premium Additional Percent |  |  | 0.15% |  |
INA Senior Notes Due May 2024 | Senior Notes [Member] |  |  |  |  |
General and significant accounting policies [Line Items] |  |  |  |  |
Debt Instrument, Face Amount |  | $ 700 |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  | 3.35% |  |  |
Huatai Group |  |  |  |  |
General and significant accounting policies [Line Items] |  |  |  |  |
Subsidiary, Ownership Percentage, Parent | 85.50% |  |  | 76.50% | 69.60%

X
- Definition General and significant accounting policies + References No definition available. + Details
Name: | cb_GeneralAndSignificantAccountingPoliciesLineItems
Namespace Prefix: | cb_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Upon election of early redemption, the interest rate percentage in addition to the applicable Treasury Rate which is required to be paid by the Company. + References No definition available. + Details
Name: | cb_MakeWholePremiumAdditionalPercent
Namespace Prefix: | cb_
Data Type: | dtr-types1:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Face (par) amount of debt instrument at time of issuance. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 835 -SubTopic 30 -Name Accounting Standards Codification -Section 55 -Paragraph 8 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482949/835-30-55-8 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 470 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1B -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481139/470-20-50-1B Reference 3: http://www.xbrl.org/2003/role/exampleRef -Topic 470 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 69B -Publisher FASB -URI https://asc.fasb.org/1943274/2147481568/470-20-55-69B Reference 4: http://www.xbrl.org/2003/role/exampleRef -Topic 470 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 69C -Publisher FASB -URI https://asc.fasb.org/1943274/2147481568/470-20-55-69C Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Topic 835 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482900/835-30-50-1 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Topic 835 -SubTopic 30 -Name Accounting Standards Codification -Section 45 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482925/835-30-45-2 + Details
Name: | us-gaap_DebtInstrumentFaceAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)(a)(1)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 470 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1B -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481139/470-20-50-1B + Details
Name: | us-gaap_DebtInstrumentInterestRateStatedPercentage
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition The parent entity's interest in net assets of the subsidiary, expressed as a percentage. + References No definition available. + Details
Name: | us-gaap_MinorityInterestOwnershipPercentageByParent
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | instant

X
- Details
Name: | us-gaap_DebtInstrumentAxis=cb_INASeniorNotesDueMarch2034Domain
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LongtermDebtTypeAxis=us-gaap_SeniorNotesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=cb_INASeniorNotesDueMay2024Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_OwnershipAxis=cb_HuataiGroupMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |