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Pension and other post-retirement benefits - Plan assets measured at fair value (Details 3) - International - CHF (SFr) SFr in Millions | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | --- | ---
Defined benefit pension plans |  |  |
Defined benefit plan, Disclosure |  |  |
Plan assets at fair value | SFr 2,166 | SFr 2,316 | SFr 3,802
Plan assets at fair value, measured at net asset value per share | 316 | 371 |
Other post-retirement defined benefit plans |  |  |
Defined benefit plan, Disclosure |  |  |
Plan assets at fair value | 0 | 0 | SFr 0
Level 1 | Defined benefit pension plans |  |  |
Defined benefit plan, Disclosure |  |  |
Plan assets at fair value | 1,076 | 1,250 |
Level 2 | Defined benefit pension plans |  |  |
Defined benefit plan, Disclosure |  |  |
Plan assets at fair value | 774 | 695 |
Level 3 | Defined benefit pension plans |  |  |
Defined benefit plan, Disclosure |  |  |
Plan assets at fair value | 0 | 0 |
Group equity securities and options | Defined benefit pension plans |  |  |
Defined benefit plan, Disclosure |  |  |
Plan assets at fair value | 70 | 106 |
Plan assets at fair value, measured at net asset value per share | 16 | 45 |
Group equity securities and options | Level 1 | Defined benefit pension plans |  |  |
Defined benefit plan, Disclosure |  |  |
Plan assets at fair value | 0 | 0 |
Group equity securities and options | Level 2 | Defined benefit pension plans |  |  |
Defined benefit plan, Disclosure |  |  |
Plan assets at fair value | 54 | 61 |
Group equity securities and options | Level 3 | Defined benefit pension plans |  |  |
Defined benefit plan, Disclosure |  |  |
Plan assets at fair value | 0 | 0 |
Cash and cash equivalents | Defined benefit pension plans |  |  |
Defined benefit plan, Disclosure |  |  |
Plan assets at fair value | 245 | 118 |
Plan assets at fair value, measured at net asset value per share | 0 | 0 |
Cash and cash equivalents | Level 1 | Defined benefit pension plans |  |  |
Defined benefit plan, Disclosure |  |  |
Plan assets at fair value | 46 | 28 |
Cash and cash equivalents | Level 2 | Defined benefit pension plans |  |  |
Defined benefit plan, Disclosure |  |  |
Plan assets at fair value | 199 | 90 |
Cash and cash equivalents | Level 3 | Defined benefit pension plans |  |  |
Defined benefit plan, Disclosure |  |  |
Plan assets at fair value | 0 | 0 |
Debt securities | Defined benefit pension plans |  |  |
Defined benefit plan, Disclosure |  |  |
Plan assets at fair value | 1,787 | 2,070 |
Plan assets at fair value, measured at net asset value per share | 300 | 326 |
Debt securities | Level 1 | Defined benefit pension plans |  |  |
Defined benefit plan, Disclosure |  |  |
Plan assets at fair value | 1,030 | 1,222 |
Debt securities | Level 2 | Defined benefit pension plans |  |  |
Defined benefit plan, Disclosure |  |  |
Plan assets at fair value | 457 | 522 |
Debt securities | Level 3 | Defined benefit pension plans |  |  |
Defined benefit plan, Disclosure |  |  |
Plan assets at fair value | 0 | 0 |
Government debt securities | Defined benefit pension plans |  |  |
Defined benefit plan, Disclosure |  |  |
Plan assets at fair value | 1,030 | 1,266 |
Plan assets at fair value, measured at net asset value per share | 0 | 0 |
Government debt securities | Level 1 | Defined benefit pension plans |  |  |
Defined benefit plan, Disclosure |  |  |
Plan assets at fair value | 1,030 | 1,222 |
Government debt securities | Level 2 | Defined benefit pension plans |  |  |
Defined benefit plan, Disclosure |  |  |
Plan assets at fair value | 0 | 44 |
Government debt securities | Level 3 | Defined benefit pension plans |  |  |
Defined benefit plan, Disclosure |  |  |
Plan assets at fair value | 0 | 0 |
Corporate debt securities | Defined benefit pension plans |  |  |
Defined benefit plan, Disclosure |  |  |
Plan assets at fair value | 757 | 804 |
Plan assets at fair value, measured at net asset value per share | 300 | 326 |
Corporate debt securities | Level 1 | Defined benefit pension plans |  |  |
Defined benefit plan, Disclosure |  |  |
Plan assets at fair value | 0 | 0 |
Corporate debt securities | Level 2 | Defined benefit pension plans |  |  |
Defined benefit plan, Disclosure |  |  |
Plan assets at fair value | 457 | 478 |
Corporate debt securities | Level 3 | Defined benefit pension plans |  |  |
Defined benefit plan, Disclosure |  |  |
Plan assets at fair value | 0 | 0 |
Alternative investments | Defined benefit pension plans |  |  |
Defined benefit plan, Disclosure |  |  |
Plan assets at fair value | (10) | (59) |
Plan assets at fair value, measured at net asset value per share | 0 | 0 |
Alternative investments | Level 1 | Defined benefit pension plans |  |  |
Defined benefit plan, Disclosure |  |  |
Plan assets at fair value | 0 | 0 |
Alternative investments | Level 2 | Defined benefit pension plans |  |  |
Defined benefit plan, Disclosure |  |  |
Plan assets at fair value | (10) | (59) |
Alternative investments | Level 3 | Defined benefit pension plans |  |  |
Defined benefit plan, Disclosure |  |  |
Plan assets at fair value | 0 | 0 |
Other alternative investments | Defined benefit pension plans |  |  |
Defined benefit plan, Disclosure |  |  |
Plan assets at fair value | (10) | (59) |
Plan assets at fair value, measured at net asset value per share | 0 | 0 |
Other alternative investments | Level 1 | Defined benefit pension plans |  |  |
Defined benefit plan, Disclosure |  |  |
Plan assets at fair value | 0 | 0 |
Other alternative investments | Level 2 | Defined benefit pension plans |  |  |
Defined benefit plan, Disclosure |  |  |
Plan assets at fair value | (10) | (59) |
Other alternative investments | Level 3 | Defined benefit pension plans |  |  |
Defined benefit plan, Disclosure |  |  |
Plan assets at fair value | 0 | 0 |
Other investments, plan assets | Defined benefit pension plans |  |  |
Defined benefit plan, Disclosure |  |  |
Plan assets at fair value | 74 | 81 |
Plan assets at fair value, measured at net asset value per share | 0 | 0 |
Other investments, plan assets | Level 1 | Defined benefit pension plans |  |  |
Defined benefit plan, Disclosure |  |  |
Plan assets at fair value | 0 | 0 |
Other investments, plan assets | Level 2 | Defined benefit pension plans |  |  |
Defined benefit plan, Disclosure |  |  |
Plan assets at fair value | 74 | 81 |
Other investments, plan assets | Level 3 | Defined benefit pension plans |  |  |
Defined benefit plan, Disclosure |  |  |
Plan assets at fair value | SFr 0 | SFr 0 |

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