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Derivatives and hedging activities - Contingent credit risk (Details 3) - CHF (SFr) SFr in Billions | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Contingent credit risk |  |
Current net exposure | SFr 0.5 | SFr 1.4
Collateral posted | 0.4 | 1.1
Scenario, Impact of a one-notch downgrade event [Member] |  |
Contingent credit risk |  |
Collateral posted | 0.3 | 0.5
Scenario, Impact of a two-notch downgrade event [Member] |  |
Contingent credit risk |  |
Collateral posted | 0.4 | 0.8
Scenario, Impact of a three-notch downgrade event [Member] |  |
Contingent credit risk |  |
Collateral posted | 0.5 | 0.8
Bilateral counterparties |  |
Contingent credit risk |  |
Current net exposure | 0.4 | 1.2
Collateral posted | 0.3 | 1.0
Bilateral counterparties | Scenario, Impact of a one-notch downgrade event [Member] |  |
Contingent credit risk |  |
Collateral posted | 0.3 | 0.4
Bilateral counterparties | Scenario, Impact of a two-notch downgrade event [Member] |  |
Contingent credit risk |  |
Collateral posted | 0.3 | 0.5
Bilateral counterparties | Scenario, Impact of a three-notch downgrade event [Member] |  |
Contingent credit risk |  |
Collateral posted | 0.4 | 0.5
Special purpose entities |  |
Contingent credit risk |  |
Current net exposure | 0.1 | 0.1
Collateral posted | 0.1 | 0.1
Special purpose entities | Scenario, Impact of a one-notch downgrade event [Member] |  |
Contingent credit risk |  |
Collateral posted | 0.0 | 0.0
Special purpose entities | Scenario, Impact of a two-notch downgrade event [Member] |  |
Contingent credit risk |  |
Collateral posted | 0.0 | 0.1
Special purpose entities | Scenario, Impact of a three-notch downgrade event [Member] |  |
Contingent credit risk |  |
Collateral posted | 0.0 | 0.1
Accelerated terminations |  |
Contingent credit risk |  |
Current net exposure | 0.0 | 0.1
Accelerated terminations | Scenario, Impact of a one-notch downgrade event [Member] |  |
Contingent credit risk |  |
Collateral posted | 0.0 | 0.1
Accelerated terminations | Scenario, Impact of a two-notch downgrade event [Member] |  |
Contingent credit risk |  |
Collateral posted | 0.1 | 0.2
Accelerated terminations | Scenario, Impact of a three-notch downgrade event [Member] |  |
Contingent credit risk |  |
Collateral posted | SFr 0.1 | SFr 0.2

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- Definition The aggregate fair value of assets that are already posted, at the end of the reporting period, as collateral for derivative instruments with credit-risk-related contingent features. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4H -Subparagraph (d) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480434/815-10-50-4H + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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

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- Definition The aggregate fair value amounts of derivative instruments that contain credit-risk-related contingent features that are in a net liability position at the end of the reporting period. For nonderivative instruments that are designated and qualify as hedging instruments, the fair value amounts are the carrying value of the nonderivative hedging instrument, including the adjustment for the foreign currency transaction gain (loss) on that instrument. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4H -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480434/815-10-50-4H + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Details
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- Details
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- Details
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- Details
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- Details
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- Details
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