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Transfers of financial assets (TFA) - Securitizations (Details) - CHF (SFr) SFr in Millions	6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022
CMBS
Transfers of financial assets disclosures
Net gain/(loss)	SFr 0	SFr 5
Proceeds from transfer of assets	0	2,819
Cash received on interests that continue to be held	13	22
Cash flows between transferee and transferor non cash proceeds from new transfers	0	272
RMBS
Transfers of financial assets disclosures
Net gain/(loss)	0	(1)
Proceeds from transfer of assets	0	6,799
Servicing fees	7	0
Cash received on interests that continue to be held	29	531
Cash flows between transferee and transferor non cash proceeds from new transfers	0	635
Other asset-backed financings
Transfers of financial assets disclosures
Net gain/(loss)	7	23
Proceeds from transfer of assets	6,677	3,808
Purchases of previously transferred financial assets or their underlying collateral	(177)	(997)
Servicing fees	98	97
Cash received on interests that continue to be held	121	36
Cash flows between transferee and transferor non cash proceeds from new transfers	SFr 4,251	SFr 65

X

- Definition

Non-cash beneficial interest (including risk retention securities) included in the total proceeds from transfer of assets

+ References

No definition available.

+ Details

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X

- Definition

Cash Flows between a transferor and a transferee attributable to newly transferred assets related to either a securitization, asset-backed financing arrangement, or similar transfer in which the transferor has continuing involvement with the transferred financial assets underlying the transaction (including, but not limited to, servicing, recourse, and restrictions on transferor's interests in the transferred financial assets).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 860
-SubTopic 20
-Section 50
-Paragraph 3
-Subparagraph (d)(1)
-URI https://asc.fasb.org/extlink&oid=121570589&loc=d3e107207-111719

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X

- Definition

Cash Flows between a transferor and a transferee attributable to purchases of previously transferred financial assets (or its underlying collateral) related to a securitization, asset-backed financing arrangement, or similar transfer in which the transferor has continuing involvement with the transferred financial assets underlying the transaction (including, but not limited to, servicing, recourse, and restrictions on transferor's interests in the transferred financial assets).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 860
-SubTopic 20
-Section 50
-Paragraph 3
-Subparagraph (d)(3)
-URI https://asc.fasb.org/extlink&oid=121570589&loc=d3e107207-111719

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X

- Definition

Cash flows between transferor and transferee in payment of service fees in advance, prior to or in contemplation of a securitization, asset-backed financing arrangement, or similar transfer in which the transferor will have continuing involvement with the transferred financial assets underlying the transaction (including, but not limited to, servicing, recourse, and restrictions on transferor's interests in the transferred financial assets).

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 860
-SubTopic 20
-Section 50
-Paragraph 3
-Subparagraph (d)(4)
-URI https://asc.fasb.org/extlink&oid=121570589&loc=d3e107207-111719

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X

- Definition

Cash Flows between a transferee and a transferor attributable to servicing fees related to a securitization, asset-backed financing arrangement, or similar transfer in which the transferor has continuing involvement with the transferred financial assets underlying the transaction (including, but not limited to, servicing, recourse, and restrictions on transferor's interests in the transferred financial assets).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 860
-SubTopic 20
-Section 50
-Paragraph 3
-Subparagraph (d)(4)
-URI https://asc.fasb.org/extlink&oid=121570589&loc=d3e107207-111719

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X

- Definition

Reflects, by transferred financial asset type, the amount of sales proceeds in excess of or deficient from the sum of the carrying amounts of transferred financial assets plus transaction costs, including those transactions in which the seller/transferor has continuing involvement with the financial assets that have been transferred.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 860
-SubTopic 20
-Section 50
-Paragraph 3
-Subparagraph (b)(3)
-URI https://asc.fasb.org/extlink&oid=121570589&loc=d3e107207-111719

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X

- 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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