XML 83 R72.htm IDEA: XBRL DOCUMENT
v3.20.2

Information provided in connection with outstanding debt of subsidiaries Information provided in connection with outstanding debt of subsidiaries (Narrative) (Details) | Jun. 30, 2020
--- | ---
Information Provided In Connection With Outstanding Debt Of Subsidiaries [Abstract] |
Equity Method Investment, Ownership Percentage | 100.00%

X
- Definition Information Provided In Connection With Outstanding Debt Of Subsidiaries [Abstract] + References No definition available. + Details
Name: | cb_InformationProvidedInConnectionWithOutstandingDebtOfSubsidiariesAbstract
Namespace Prefix: | cb_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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