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FI - Fair value, unfunded commitments, term of redemption conditions (Details 12) - CHF (SFr) SFr in Millions | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Schedule of Investments, Fair Value Calculated Using Net Asset Value |  |
Non-redeemable | SFr 480 | SFr 514
Redeemable | 106 | 429
Total fair value | 586 | 943
Unfunded commitments | 135 | 177
Investments, Fair Value Calculated Using Net Asset Value, Additional Disclosures |  |
Nonredeemable with known Liquidation Periods | 290 | 276
Nonredeemable with unknown Liquidation Periods | 190 | 238
Redeemable on demand with notice period less than 30 days | 63 | 234
Funds held in trading assets and liabilities |  |
Schedule of Investments, Fair Value Calculated Using Net Asset Value |  |
Non-redeemable | 80 | 128
Redeemable | 95 | 415
Total fair value | 175 | 543
Unfunded commitments | 0 | 14
Funds held in other investments |  |
Schedule of Investments, Fair Value Calculated Using Net Asset Value |  |
Non-redeemable | 400 | 386
Redeemable | 11 | 14
Total fair value | 411 | 400
Unfunded commitments | 135 | 163
Funds held in other investments | Hedge funds |  |
Schedule of Investments, Fair Value Calculated Using Net Asset Value |  |
Non-redeemable | 13 | 13
Redeemable | 0 | 1
Total fair value | 13 | 14
Unfunded commitments | 1 | 1
Funds held in other investments | Private equity funds |  |
Schedule of Investments, Fair Value Calculated Using Net Asset Value |  |
Non-redeemable | 88 | 58
Redeemable | 0 | 0
Total fair value | 88 | 58
Unfunded commitments | 52 | 48
Funds held in other investments | Equity method investments |  |
Schedule of Investments, Fair Value Calculated Using Net Asset Value |  |
Non-redeemable | 299 | 315
Redeemable | 11 | 13
Total fair value | 310 | 328
Unfunded commitments | SFr 82 | SFr 114

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- Definition For investments that do not have readily determinable fair values, this element represents the portion of the investment that is non-redeemable. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- References No definition available. + Details
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- Definition For investments that do not have readily determinable fair values, this element represents the portion of the investment that is redeemable. + References No definition available. + Details
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Balance Type: | debit
Period Type: | instant

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- Definition dup_1_For investments that do not have readily determinable fair values, this element represents the portion of the investment that is redeemable, and is attributable to non-controlling Interest. + References No definition available. + Details
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- Definition Fair value of investment other than investment in equity security, investment in debt security and equity method investment. Includes, but is not limited to, investment in certain entities that calculate net asset value per share. Example includes, but is not limited to, investment in hedge fund, venture capital fund, private equity fund, and real estate partnership or fund. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 35 -Paragraph 54B -Publisher FASB -URI https://asc.fasb.org//1943274/2147482134/820-10-35-54B Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 6A -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482106/820-10-50-6A + Details
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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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- Definition The amount of unfunded commitments for which the entity is obligated, to those certain investments for which net asset value per share is calculated (including by unit, membership interest, or other equity (ownership interest) unit measure) (alternative investments). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 6A -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482106/820-10-50-6A + Details
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