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Investment securities - Maturities of amortized costs/FV/Avg yield (Details 5) - CHF (SFr) SFr in Millions | Dec. 31, 2023 | Dec. 31, 2022
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Schedule of Held-to-maturity Securities [Line Items] |  |
Due within 1 year, amortized cost | SFr 0 |
Due from 1 to 5 years, amortized cost | 1,417 |
Debt securities held-to-maturity, amortized cost | 1,417 |
Accrued interest excluded from amortized cost base of total Debt securities held-to-maturity | 19 | SFr 10
Due within 1 year, fair value | 0 |
Due from 1 to 5 years, fair value | 1,300 |
Debt securities held-to-maturity, fair value | SFr 1,300 |
Due within 1 year, average yield (as a percent) | 0.00% |
Due from 1 to 5 years, average yield (as a percent) | 3.66% |
Total, average yield (as a percent) | 3.66% |

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- Definition Weighted average yield of investment in debt security measured at amortized cost (held-to-maturity) maturing in second through fifth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name Regulation S-K (SK) -Number 229 -Section 1403 -Paragraph (a) -Subparagraph (2) -Publisher SEC Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Name Industry Guide -Number 3 -Section II -Paragraph B -Publisher SEC + Details
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