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Pension and other post-retirement benefits - PBO/ABO/Fair value (Details 2) - International - CHF (SFr) SFr in Millions | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | --- | ---
Defined benefit pension plans |  |  |
Defined benefit plan, Disclosure |  |  |
PBO | SFr 1,768 | SFr 1,897 | SFr 3,022
ABO | 1,758 | 1,880 |
Defined benefit pension plans | PBO exceeds fair value of plan assets |  |  |
Defined benefit plan, Disclosure |  |  |
PBO | 127 | 809 |
ABO | 120 | 797 |
Fair value of plan assets | 5 | 669 |
Defined benefit pension plans | ABO exceeds fair value of plan assets |  |  |
Defined benefit plan, Disclosure |  |  |
PBO | 127 | 146 |
ABO | 120 | 135 |
Fair value of plan assets | 5 | 6 |
Other post-retirement defined benefit plans |  |  |
Defined benefit plan, Disclosure |  |  |
PBO | 94 | 107 | SFr 140
ABO | SFr 94 | SFr 107 |

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- Definition Amount of actuarial present value of benefits attributed to employee service rendered, excluding assumptions about future compensation level. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (e) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480506/715-20-50-1 + Details
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- Definition Amount of actuarial present value of benefits attributed to service rendered by employee for defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480506/715-20-50-1 + Details
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