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Tax - Balance sheet related (Details 2) - CHF (SFr) SFr in Millions | Jun. 30, 2023 | Dec. 31, 2022
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Tax effect of temporary differences |  |
Net operating loss carry-forwards, after allocation of valuation allowances | SFr 12 | SFr 138
Net deferred tax assets | SFr (95) | SFr (411)

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- Definition Amount after allocation of valuation allowances of deferred tax asset attributable to deductible operating loss carryforwards. + References No definition available. + Details
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Namespace Prefix: | cs_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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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

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- Definition Amount, after allocation of valuation allowances and deferred tax liability, of deferred tax asset attributable to deductible differences and carryforwards, without jurisdictional netting. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -URI https://asc.fasb.org/extlink&oid=121826272&loc=d3e32537-109319 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant