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Unearned revenue liability (URL Rollforward) (Details) - USD ($) $ in Millions | 6 Months Ended |  |
--- | --- | --- | ---
Jun. 30, 2024 | Jun. 30, 2023 | Dec. 31, 2023 | Dec. 31, 2022
Insurance [Abstract] |  |  |  |
Balance – beginning of period | $ 675 | $ 608 | $ 673 | $ 567
Deferred revenue | 69 | 63 |  |
Amortization | (36) | (29) |  |
Other (including foreign exchange) | (31) | 7 |  |
Balance – end of period | $ 675 | $ 608 | $ 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
Name: | cb_UnearnedRevenueLiabilityAmortization
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
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Namespace Prefix: | cb_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
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- References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration