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Revenue from contracts with customers (Tables) | 6 Months Ended
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Jun. 30, 2023
Contract with Customer, Asset and Liability [Table Text Block] | Contracts with customers and disaggregation of revenues
in |  | 6M23 |  | 6M22 |
Contracts with customers (CHF million)
Investment and portfolio management |  | 1,308 |  | 1,578 |
Other securities business |  | 33 |  | 29 |
Underwriting |  | 117 |  | 370 |
Brokerage |  | 765 |  | 1,277 |
Other services |  | 469 |  | 786 |
Total revenues from contracts with customers |  | 2,692 |  | 4,040 |
Revenue from External Customers by Products and Services [Table Text Block] | Contract balances
end of |  | 6M23 |  | 2022 |
Contract balances (CHF million)
Contract receivables |  | 580 |  | 686 |
Contract liabilities |  | 47 |  | 54 |
in |  | 2Q23 |  | 1Q23 |
Revenue recognized (CHF million)
Revenue recognized in the reporting period included in the contract liabilities balance at the beginning of period |  | 7 |  | 10 |

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- Definition Tabular disclosure of receivable, contract asset, and contract liability from contract with customer. Includes, but is not limited to, change in contract asset and contract liability. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 10 -URI https://asc.fasb.org/extlink&oid=126920106&loc=SL49130551-203045 + Details
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Namespace Prefix: | us-gaap_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration

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- Definition Tabular disclosure of entity-wide revenues from external customers for each product or service or each group of similar products or services if the information is not provided as part of the reportable operating segment information. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 40 -URI https://asc.fasb.org/extlink&oid=126901519&loc=d3e9031-108599 + Details
Name: | us-gaap_ScheduleOfEntityWideInformationRevenueFromExternalCustomersByProductsAndServicesTextBlock
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration