XML 127 R110.htm IDEA: XBRL DOCUMENT
v3.22.0.1

Shareholders' equity (Detail) $ / shares in Units, $ in Millions | 12 Months Ended |  |  |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Dec. 31, 2022 shares | Dec. 31, 2021 SFr / shares shares | Dec. 31, 2020 SFr / shares shares | Dec. 31, 2019 shares | Jul. 19, 2021 USD ($) | May 31, 2021 $ / shares | Feb. 01, 2021 USD ($) | Nov. 19, 2020 USD ($) | May 31, 2020 $ / shares | Nov. 21, 2019 USD ($) | May 31, 2019 $ / shares | Dec. 01, 2018 USD ($)
Stockholders' Equity Note [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Common Stock, Dividend Rate Approved | $ / shares |  |  |  |  |  | $ 0.80 |  |  | $ 0.78 |  | $ 0.75 |
The number of votes associated with one Common Share |  | one |  |  |  |  |  |  |  |  |  |
Annual dividend per share approved by shareholders | $ / shares |  |  |  |  |  | $ 3.20 |  |  | $ 3.12 |  | $ 3.00 |
Authorized Share Capital [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Common Shares, par value | SFr / shares |  | SFr 24.15 | SFr 24.15 |  |  |  |  |  |  |  |  |
Treasury Stock, Shares, Retired | shares |  | 3,584,150 | 2,178,600 | 0 |  |  |  |  |  |  |  |
The maximum ownership percentage for voting allowed for any one shareholder |  | 10.00% |  |  |  |  |  |  |  |  |  |
General Purpose |  |  |  |  |  |  |  |  |  |  |  |
Authorized Share Capital [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Authorized share capital for future issuance | shares |  | 200,000,000 |  |  |  |  |  |  |  |  |  |
Issuance of Debt |  |  |  |  |  |  |  |  |  |  |  |
Authorized Share Capital [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Authorized share capital for future issuance | shares |  | 33,000,000 |  |  |  |  |  |  |  |  |  |
Employee Benefit Plans |  |  |  |  |  |  |  |  |  |  |  |
Authorized Share Capital [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Authorized share capital for future issuance | shares |  | 25,410,929 |  |  |  |  |  |  |  |  |  |
2019 Stock Repurchase Plan [Member] |  |  |  |  |  |  |  |  |  |  |  |
Authorized Share Capital [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Stock repurchase program authorized amount | $ |  |  |  |  |  |  |  |  |  |  |  | $ 1,500
Nov 2019 Stock Repurchase Plan [Member] |  |  |  |  |  |  |  |  |  |  |  |
Authorized Share Capital [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Stock repurchase program authorized amount | $ |  |  |  |  |  |  |  |  |  | $ 1,500 |  |
Nov 2020 Stock Repurchase Plan [Member] |  |  |  |  |  |  |  |  |  |  |  |
Authorized Share Capital [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Stock repurchase program authorized amount | $ |  |  |  |  |  |  | $ 2,500 | $ 1,500 |  |  |  |
CB_Increase(Decrease)StockRepurchaseProgramAuthorizedAmount | $ |  |  |  |  |  |  | $ 1,000 |  |  |  |  |
July 2021 Stock Repurchase Plan |  |  |  |  |  |  |  |  |  |  |  |
Authorized Share Capital [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Stock repurchase program authorized amount | $ |  |  |  |  | $ 5,000 |  |  |  |  |  |  |
Subsequent Event [Member] |  |  |  |  |  |  |  |  |  |  |  |
Authorized Share Capital [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Treasury Stock, Shares, Retired | shares | 14,465,400 |  |  |  |  |  |  |  |  |  |  |

X
- Definition Annual dividend per share approved by shareholders + References No definition available. + Details
Name: | cb_Annualdividendpershareapprovedbyshareholders
Namespace Prefix: | cb_
Data Type: | dtr-types:perShareItemType
Balance Type: | na
Period Type: | instant

X
- Definition CB_Increase(Decrease)StockRepurchaseProgramAuthorizedAmount + References No definition available. + Details
Name: | cb_CB_IncreaseDecreaseStockRepurchaseProgramAuthorizedAmount
Namespace Prefix: | cb_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Common Stock, Dividend Rate Approved + References No definition available. + Details
Name: | cb_CommonStockDividendRateApproved
Namespace Prefix: | cb_
Data Type: | dtr-types:perShareItemType
Balance Type: | na
Period Type: | instant

X
- Definition The maximum ownership percentage for voting allowed for any one shareholder. + References No definition available. + Details
Name: | cb_CommonStockMaximumOwnershipPercentageForVoting
Namespace Prefix: | cb_
Data Type: | dtr-types: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_ClassOfStockLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Aggregate number of common shares reserved for future issuance. + 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 210.5-02.29) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
Name: | us-gaap_CommonStockCapitalSharesReservedForFutureIssuance
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

X
- Definition Face amount or stated value per share of common stock. + 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(29)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
Name: | us-gaap_CommonStockParOrStatedValuePerShare
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:perShareItemType
Balance Type: | na
Period Type: | instant

X
- Definition Description of voting rights of common stock. Includes eligibility to vote and votes per share owned. Include also, if any, unusual voting rights. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=123467817&loc=d3e21475-112644 + Details
Name: | us-gaap_CommonStockVotingRights
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of stock repurchase plan authorized. + References No definition available. + Details
Name: | us-gaap_StockRepurchaseProgramAuthorizedAmount1
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- References No definition available. + Details
Name: | us-gaap_StockholdersEquityNoteAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Number of shares of common and preferred stock retired from treasury during the period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=120397183&loc=d3e187085-122770 Reference 2: 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(29)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=123467817&loc=d3e21463-112644 + Details
Name: | us-gaap_TreasuryStockSharesRetired
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | cb_ConditionalShareIssuanceByScenarioAxis=cb_GeneralPurposeMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | cb_ConditionalShareIssuanceByScenarioAxis=cb_IssuanceofDebt1Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | cb_ConditionalShareIssuanceByScenarioAxis=cb_EmployeeBenefitPlansMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_ShareRepurchaseProgramAxis=cb_A2019StockRepurchasePlanMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_ShareRepurchaseProgramAxis=cb_Nov2019StockRepurchasePlanMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_ShareRepurchaseProgramAxis=cb_Nov2020StockRepurchasePlanMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_ShareRepurchaseProgramAxis=cb_July2021StockRepurchasePlanMember
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: |