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TFA - Key economic assumptions at time of transfer (Details 3) - CHF (SFr) SFr in Millions | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Key economic assumptions used in measuring fair value at time of transfer |  |  |
Fair value of beneficial interests at time of transfer | SFr 0 |  |
Prepayment speed rate assumed used for projecting payments over the life of a residential mortgage loan (as a percent) | 100.00% |  |
Prepayment rate per annum of the outstanding principal balance of mortgage loans in the first month assuming 100% prepayment (as a percent) | 0.20% |  |
Prepayment rate per annum of the outstanding principal balance of mortgage loans after the first month assuming 100% prepayment (as a percent) | 0.20% |  |
Constant prepayment rate assumed using a 100% prepayment assumption (as a percent) | 6.00% |  |
CMBS |  |  |
Key economic assumptions used in measuring fair value at time of transfer |  |  |
Fair value of beneficial interests at time of transfer |  | SFr 486 | SFr 196
Weighted-average life, in years |  | 4 years 1 month 6 days | 5 years 2 months 12 days
CMBS | Minimum |  |  |
Key economic assumptions used in measuring fair value at time of transfer |  |  |
Cash flow discount rate (rate per annum), in % (as a percent) |  | 3.50% | 1.80%
Expected credit losses (rate per annum), in % (as a percent) |  | 2.70% | 0.90%
CMBS | Maximum |  |  |
Key economic assumptions used in measuring fair value at time of transfer |  |  |
Cash flow discount rate (rate per annum), in % (as a percent) |  | 15.70% | 5.00%
Expected credit losses (rate per annum), in % (as a percent) |  | 5.60% | 4.30%
CMBS | Level 2 |  |  |
Key economic assumptions used in measuring fair value at time of transfer |  |  |
Fair value of beneficial interests at time of transfer |  | SFr 415 | SFr 170
CMBS | Level 3 |  |  |
Key economic assumptions used in measuring fair value at time of transfer |  |  |
Fair value of beneficial interests at time of transfer |  | 71 | 26
RMBS |  |  |
Key economic assumptions used in measuring fair value at time of transfer |  |  |
Fair value of beneficial interests at time of transfer |  | SFr 847 | SFr 2,594
Weighted-average life, in years |  | 9 years 6 months | 5 years 3 months 18 days
RMBS | Minimum |  |  |
Key economic assumptions used in measuring fair value at time of transfer |  |  |
Prepayment speed assumption (rate per annum) in % (as a percent) |  | 5.00% | 3.00%
Cash flow discount rate (rate per annum), in % (as a percent) |  | 2.80% | 1.00%
Expected credit losses (rate per annum), in % (as a percent) |  | 1.30% | 0.10%
RMBS | Maximum |  |  |
Key economic assumptions used in measuring fair value at time of transfer |  |  |
Prepayment speed assumption (rate per annum) in % (as a percent) |  | 22.20% | 37.70%
Cash flow discount rate (rate per annum), in % (as a percent) |  | 53.80% | 33.40%
Expected credit losses (rate per annum), in % (as a percent) |  | 49.80% | 32.50%
RMBS | Level 2 |  |  |
Key economic assumptions used in measuring fair value at time of transfer |  |  |
Fair value of beneficial interests at time of transfer |  | SFr 762 | SFr 2,126
RMBS | Level 3 |  |  |
Key economic assumptions used in measuring fair value at time of transfer |  |  |
Fair value of beneficial interests at time of transfer |  | SFr 85 | SFr 468

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- Definition Represents the prepayment speed rate assumed used for projecting payments over the life of a residential mortgage loan. + References No definition available. + Details
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- Definition Represents the constant prepayment rate assumed using a 100 percent prepayment assumption. + References No definition available. + Details
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- Definition Represents the prepayment rate per annum of the outstanding principal balance of mortgage loans in the first month assuming 100 percent prepayment. + References No definition available. + Details
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- Definition Represents the prepayment rate per annum of the outstanding principal balance of mortgage loans after the first month assuming 100 percent prepayment. + References No definition available. + Details
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- Definition Discount rate which is used to value residual cash flows generated by financial assets of the securitization, asset-backed financing arrangement, or similar transfer for initial fair value measurement. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 860 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (c)(1) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481326/860-20-50-3 + Details
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- Definition Rate at which principal will not be repaid on securitized financial assets, including for example, but not limited to, expected static pool losses for initial fair value measurement. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 860 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (c)(3) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481326/860-20-50-3 + Details
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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 Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 860 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (b)(2)(i) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481326/860-20-50-3 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 860 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (b)(2)(ii) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481326/860-20-50-3 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 860 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (bb)(1) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481326/860-20-50-3 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 860 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (bb)(2) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481326/860-20-50-3 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Topic 860 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (bb)(3) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481326/860-20-50-3 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Topic 860 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (c)(1) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481326/860-20-50-3 Reference 7: http://www.xbrl.org/2003/role/disclosureRef -Topic 860 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (c)(2) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481326/860-20-50-3 Reference 8: http://www.xbrl.org/2003/role/disclosureRef -Topic 860 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (c)(3) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481326/860-20-50-3 Reference 9: http://www.xbrl.org/2003/role/disclosureRef -Topic 860 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 4 -Subparagraph (b)(1) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481326/860-20-50-4 Reference 10: http://www.xbrl.org/2003/role/disclosureRef -Topic 860 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 4 -Subparagraph (b)(2) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481326/860-20-50-4 Reference 11: http://www.xbrl.org/2003/role/disclosureRef -Topic 860 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 4 -Subparagraph (b)(3) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481326/860-20-50-4 + Details
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- Definition Estimated rate of prepayment of principal on financial assets for initial fair value measurement. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 860 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (c)(2) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481326/860-20-50-3 + Details
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- Definition Weighted average life of securitized assets for initial fair value measurement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 860 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (c)(2) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481326/860-20-50-3 + Details
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- Definition Represents the initial fair value recorded for assets received on transfer of financial assets in a securitization, asset-backed financing arrangement, or a similar transfer which transaction is recognized as a sale of the transferred financial assets. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 860 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (b)(2)(i) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481326/860-20-50-3 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 860 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (bb)(1) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481326/860-20-50-3 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 860 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (bb)(2) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481326/860-20-50-3 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 860 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (bb)(3) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481326/860-20-50-3 + Details
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