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Investment securities - Maturities of amortized costs/FV/Avg yield (Details 5) - CHF (SFr) SFr in Millions | Jun. 30, 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 | 1,498 |
Due from 5 to 10 years, amortized cost | 0 |
Debt securities held-to-maturity, amortized cost | 1,498 |
Accrued interest excluded from amortized cost base of total Debt securities held-to-maturity | 18 | SFr 10
Due within 1 year, fair value | 0 |
Due from 1 to 5 years, fair value | 1,467 |
Due from 5 to 10 years, fair value | 0 |
Debt securities held-to-maturity, fair value | SFr 1,467 |
Due within 1 year, average yield (as a percent) | 0.00% |
Due from 1 to 5 years, average yield (as a percent) | 3.67% |
Due from 5 to 10 years, average yield (as a percent) | 0.00% |
Total, average yield (as a percent) | 3.67% |

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- Definition Amount, before allowance for credit loss, of accrued interest on investment in debt security measured at amortized cost (held-to-maturity). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 3B -URI https://asc.fasb.org/extlink&oid=124255953&loc=SL120267963-210447 + Details
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- Definition Weighted average yield of investment in debt security measured at amortized cost (held-to-maturity) maturing in sixth through tenth 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 -Publisher SEC -Name Regulation S-K (SK) -Number 229 -Section 1403 -Paragraph (a) -Subparagraph (3) Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher SEC -Name Industry Guide -Number 3 -Section II -Paragraph B + Details
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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/2009/role/commonPracticeRef -Publisher SEC -Name Industry Guide -Number 3 -Section II -Paragraph B Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher SEC -Name Regulation S-K (SK) -Number 229 -Section 1403 -Paragraph (a) -Subparagraph (2) + Details
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- Definition Fair value of investment in debt security measured at amortized cost (held-to-maturity), with single maturity date and allocated without single maturity date, maturing in sixth through tenth 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 -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 320 -Section 50 -Paragraph 3A -Subparagraph (c) -URI https://asc.fasb.org/extlink&oid=126980459&loc=SL120269850-112803 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (f)(3) -URI https://asc.fasb.org/extlink&oid=126970911&loc=d3e27232-111563 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5B -Subparagraph (c) -URI https://asc.fasb.org/extlink&oid=126970911&loc=SL120269825-111563 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 320 -Section 50 -Paragraph 3 -Subparagraph (c) -URI https://asc.fasb.org/extlink&oid=126980459&loc=d3e62586-112803 + Details
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