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Unearned revenue liability (URL Rollforward) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Insurance [Abstract] |  |  |
Balance – beginning of period | $ 567 | $ 503 | $ 393
Deferred revenue | 134 | 142 | 144
Amortization | (67) | (50) | (38)
Other (including foreign exchange) | 39 | (28) | 4
Balance – end of period | $ 673 | $ 567 | $ 503

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- Definition Unearned revenue liability + References No definition available. + Details
Name: | cb_UnearnedRevenueLiability
Namespace Prefix: | cb_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Unearned revenue liability, Amortization expense + References No definition available. + Details
Name: | cb_UnearnedRevenueLiabilityAmortizationExpense
Namespace Prefix: | cb_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Unearned revenue liability, Deferred revenue + References No definition available. + Details
Name: | cb_UnearnedRevenueLiabilityDeferredRevenue
Namespace Prefix: | cb_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Unearned revenue liability, Other increase (decrease) + References No definition available. + Details
Name: | cb_UnearnedRevenueLiabilityOtherIncreaseDecrease
Namespace Prefix: | cb_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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