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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

X

- 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

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X

- 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

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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- Definition

Amount of plan asset for defined benefit plan with accumulated benefit obligation in excess of plan assets.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Topic 715
-SubTopic 20
-Name Accounting Standards Codification
-Section 55
-Paragraph 17
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480482/715-20-55-17

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 715
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 3
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480506/715-20-50-3

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-URI https://asc.fasb.org//1943274/2147480506/715-20-50-3

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