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Pension and other post-retirement benefits (Details 11) - CHF (SFr) SFr in Millions | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Actuarial gains/(losses) |  |  |
Increase (Decrease) in Accumulated other Comprehensive Income |  |  |
OCI, before Reclassifications, Net of Tax, Attributable to Parent | SFr (37) | SFr (170) | SFr 12
Net prior service credit/ (cost) |  |  |
Increase (Decrease) in Accumulated other Comprehensive Income |  |  |
OCI, before Reclassifications, Net of Tax, Attributable to Parent | SFr 0 | SFr (4) | SFr 4

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- Definition Amount after tax, before reclassification adjustments, of other comprehensive income (loss), attributable to parent. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -Publisher FASB -URI https://asc.fasb.org//1943274/2147482790/220-10-45-14A Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 55 -Paragraph 15 -SubTopic 10 -Topic 220 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482739/220-10-55-15 + Details
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