XML 41 R39.htm IDEA: XBRL DOCUMENT
v3.20.1

Acquisitions Investments (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2021 | Mar. 31, 2020
Investment Holdings [Line Items] |  |
Equity Method Investment, Ownership Percentage |  | 100.00%
Huatai Group [Member] |  |
Investment Holdings [Line Items] |  |
Equity Method Investment, Ownership Percentage |  | 30.90%
Huatai Group [Member] | CHINA | Subsequent Event [Member] |  |
Investment Holdings [Line Items] |  |
Equity method investment, additional ownership agreed to be purchased | 22.40% |
Amount agreed to acquire 22.4 percent of Huatai Group | $ 1,550 |
Equity method investment, additional 15.3 ownership percentage obtained | 15.30% |
Portion one of payments to acquire 22.4% of Huatai Group | $ 1,100 |
Equity method investment, additional 7.1 percentage obtained | 7.10% |
Portion two of payments to acquire equity method investments | $ 493 |
Subsidiary or Equity Method Investee, Cumulative Percentage Ownership after All Transactions | 53.30% |

X
- Definition Amount agreed to acquire 22.4 percent of Huatai Group + References No definition available. + Details
Name: | cb_Amountagreedtoacquire22.4percentofHuataiGroup
Namespace Prefix: | cb_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Equity method investment, additional 15.3 percentage obtained + References No definition available. + Details
Name: | cb_Equitymethodinvestmentadditional15.3ownershippercentageobtained
Namespace Prefix: | cb_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Equity method investment, additional 7.1 percentage obtained + References No definition available. + Details
Name: | cb_Equitymethodinvestmentadditional7.1percentageobtained
Namespace Prefix: | cb_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Equity method investment, additional ownership agreed to be purchased + References No definition available. + Details
Name: | cb_Equitymethodinvestmentadditionalownershipagreedtobepurchased
Namespace Prefix: | cb_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of payment agreed to acquire 15.3% of Huatai Group + References No definition available. + Details
Name: | cb_Portiononeofpaymentstoacquire22.4ofHuataiGroup
Namespace Prefix: | cb_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The $493M cash outflow associated with the purchase of or advances to an equity method investments. + References No definition available. + Details
Name: | cb_Portiontwoofpaymentstoacquireequitymethodinvestments
Namespace Prefix: | cb_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
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

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_InvestmentHoldingsLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Percentage of subsidiary's or equity method investee's stock owned by parent immediately after all stock transactions. + References No definition available. + Details
Name: | us-gaap_SubsidiaryOrEquityMethodInvesteeCumulativePercentageOwnershipAfterAllTransactions
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | dei_LegalEntityAxis=cb_HuataiGroupMember
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: | us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |