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Investment securities (Tables) | 12 Months Ended
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Dec. 31, 2023
Investment securities |
end of |  | 2023 |  | 2022 |
Investment securities (CHF million)
Debt securities held-to-maturity |  | 1,417 |  | 921 |
Debt securities available-for-sale |  | 4 |  | 796 |
Total investment securities |  | 1,421 |  | 1,717 |
Investment securities by type | Investment securities by type
|  | 2023 |  | 2022 |
end of |  | Amortized cost |  | Allowance for credit losses |  | Gross unrealized gains |  | Gross unrealized losses |  | Fair value |  | Amortized cost |  | Allowance for credit losses |  | Gross unrealized gains |  | Gross unrealized losses |  | Fair value |
Investment securities by type (CHF million)
Foreign governments |  | 1,259 |  | 0 |  | 0 |  | 110 |  | 1,149 |  | 921 |  | 0 |  | 0 |  | 40 |  | 881 |
Corporate debt securities |  | 158 |  | 0 |  | 0 |  | 7 |  | 151 |  | 0 |  | 0 |  | 0 |  | 0 |  | 0 |
Debt securities held-to-maturity |  | 1,417 | 1 | 0 |  | 0 |  | 117 |  | 1,300 |  | 921 | 1 | 0 |  | 0 |  | 40 |  | 881 |
Corporate debt securities |  | 4 |  | 0 |  | 0 |  | 0 |  | 4 |  | 952 |  | 0 |  | 0 |  | 156 |  | 796 |
Debt securities available-for-sale |  | 4 | 2 | 0 |  | 0 |  | 0 |  | 4 |  | 952 | 2 | 0 |  | 0 |  | 156 |  | 796 |
1 Excludes accrued interest on debt securities held-to-maturity of CHF 19 million and CHF 10 million as of the end of 2023 and 2022, respectively, with no related allowance for credit losses. Accrued interest is reported in other assets in the consolidated balance sheet.
2 Excludes accrued interest on debt securities available-for-sale of CHF 0 million and CHF 1 million as of the end of 2023 and 2022, respectively. Accrued interest is reported in other assets in the consolidated balance sheet.
Gross unrealized losses on investment securities and the related fair value | Gross unrealized losses on debt securities and the related fair value
|  | Less than 12 months |  | 12 months or more |  | Total |
end of |  | Fair value |  | Gross unrealized losses |  | Fair value |  | Gross unrealized losses |  | Fair value |  | Gross unrealized losses |
2022 (CHF million)
Corporate debt securities |  | 374 |  | 58 |  | 404 |  | 98 |  | 778 |  | 156 |
Debt securities available-for-sale |  | 374 |  | 58 |  | 404 |  | 98 |  | 778 |  | 156 |
Proceeds from sales, realized gains and realized losses from available-for-sale securities | Proceeds from sales, realized gains and realized losses from debt securities available-for-sale
in |  | 2023 |  | 2022 |  | 2021 |
Sales of debt securities available-for-sale (CHF million)
Proceeds from sales |  | 845 |  | 44 |  | 0 |
Realized losses |  | (4) |  | (6) |  | 0 |
Amortized cost, fair value and average yield of debt securities | Amortized cost, fair value and average yield of debt securities
|  | Debt securities held-to-maturity |  | Debt securities available-for-sale |
end of |  | Amortized cost |  | Fair value |  | Average yield (in %) |  | Amortized cost |  | Fair value |  | Average yield (in %) |
2023 (CHF million)
Due within 1 year |  | 0 |  | 0 |  | 0.00 |  | 4 |  | 4 |  | 33.55 |
Due from 1 to 5 years |  | 1,417 |  | 1,300 |  | 3.66 |  | 0 |  | 0 |  | 0.00 |
Total debt securities |  | 1,417 | 1 | 1,300 |  | 3.66 |  | 4 | 2 | 4 |  | 33.55 |
1 Excluded accrued interest on debt securities held-to-maturity of CHF 19 million.
2 Excluded accrued interest on debt securities available-for-sale of CHF 0 million.

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- Definition Tabular disclosure of the proceeds from sales of available-for-sale securities and the gross realized gains and gross realized losses that have been included in earnings as a result of those sales. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 9 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481800/320-10-50-9 + Details
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- Definition For all investments in an unrealized loss position, including those for which other-than-temporary impairments have not been recognized in earnings (including investments for which a portion of an other-than-temporary impairment has been recognized in other comprehensive income), a tabular disclosure of the aggregate related fair value of investments with unrealized losses and the aggregate amount of unrealized losses (that is, the amount by which amortized cost basis exceeds fair value). + References Reference 1: http://fasb.org/us-gaap/role/ref/otherTransitionRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Publisher FASB -URI https://asc.fasb.org//1943274/2147481800/320-10-50-6 + Details
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