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Unearned revenue liability (URL Rollforward) (Details) - USD ($) $ in Millions | 9 Months Ended |  |
--- | --- | --- | ---
Sep. 30, 2024 | Sep. 30, 2023 | Dec. 31, 2023 | Dec. 31, 2022
Insurance [Abstract] |  |  |  |
Balance – beginning of period | $ 712 | $ 604 | $ 673 | $ 567
Deferred revenue | 106 | 96 |  |
Amortization | (54) | (44) |  |
Other (including foreign exchange) | (13) | (15) |  |
Balance – end of period | $ 712 | $ 604 | $ 673 | $ 567

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- Definition Unearned Revenue Liability + References No definition available. + Details
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Namespace Prefix: | cb_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Unearned Revenue Liability, Amortization + References No definition available. + Details
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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
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Namespace Prefix: | cb_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- 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