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Pension and other post-retirement benefits - Weighted-average assumptions (Details 5) - Defined benefit pension plans	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Switzerland
Defined benefit plan, Disclosure
Weighted-average plan asset allocation (as a percent)		100.00%	100.00%
Switzerland | Forecast/Estimate
Target asset allocation next fiscal year (%)
Target weighted-average asset allocations (as a percent)	100.00%
Switzerland | Cash and cash equivalents
Defined benefit plan, Disclosure
Weighted-average plan asset allocation (as a percent)		1.40%	1.60%
Switzerland | Cash and cash equivalents | Forecast/Estimate
Target asset allocation next fiscal year (%)
Target weighted-average asset allocations (as a percent)	3.00%
Switzerland | Debt securities
Defined benefit plan, Disclosure
Weighted-average plan asset allocation (as a percent)		43.40%	35.20%
Switzerland | Debt securities | Forecast/Estimate
Target asset allocation next fiscal year (%)
Target weighted-average asset allocations (as a percent)	40.50%
Switzerland | Equity securities
Defined benefit plan, Disclosure
Weighted-average plan asset allocation (as a percent)		16.20%	27.30%
Switzerland | Equity securities | Forecast/Estimate
Target asset allocation next fiscal year (%)
Target weighted-average asset allocations (as a percent)	20.50%
Switzerland | Real estate
Defined benefit plan, Disclosure
Weighted-average plan asset allocation (as a percent)		21.30%	18.40%
Switzerland | Real estate | Forecast/Estimate
Target asset allocation next fiscal year (%)
Target weighted-average asset allocations (as a percent)	24.00%
Switzerland | Alternative investments
Defined benefit plan, Disclosure
Weighted-average plan asset allocation (as a percent)		17.70%	17.50%
Switzerland | Alternative investments | Forecast/Estimate
Target asset allocation next fiscal year (%)
Target weighted-average asset allocations (as a percent)	12.00%
Switzerland | Insurance
Defined benefit plan, Disclosure
Weighted-average plan asset allocation (as a percent)		0.00%	0.00%
Switzerland | Insurance | Forecast/Estimate
Target asset allocation next fiscal year (%)
Target weighted-average asset allocations (as a percent)	0.00%
International
Defined benefit plan, Disclosure
Weighted-average plan asset allocation (as a percent)		100.00%	100.00%
International | Forecast/Estimate
Target asset allocation next fiscal year (%)
Target weighted-average asset allocations (as a percent)	100.00%
International | Cash and cash equivalents
Defined benefit plan, Disclosure
Weighted-average plan asset allocation (as a percent)		5.10%	2.90%
International | Cash and cash equivalents | Forecast/Estimate
Target asset allocation next fiscal year (%)
Target weighted-average asset allocations (as a percent)	1.10%
International | Debt securities
Defined benefit plan, Disclosure
Weighted-average plan asset allocation (as a percent)		89.40%	92.90%
International | Debt securities | Forecast/Estimate
Target asset allocation next fiscal year (%)
Target weighted-average asset allocations (as a percent)	91.70%
International | Equity securities
Defined benefit plan, Disclosure
Weighted-average plan asset allocation (as a percent)		4.50%	2.60%
International | Equity securities | Forecast/Estimate
Target asset allocation next fiscal year (%)
Target weighted-average asset allocations (as a percent)	3.70%
International | Real estate
Defined benefit plan, Disclosure
Weighted-average plan asset allocation (as a percent)		0.00%	0.00%
International | Real estate | Forecast/Estimate
Target asset allocation next fiscal year (%)
Target weighted-average asset allocations (as a percent)	0.00%
International | Alternative investments
Defined benefit plan, Disclosure
Weighted-average plan asset allocation (as a percent)		2.50%	0.70%
International | Alternative investments | Forecast/Estimate
Target asset allocation next fiscal year (%)
Target weighted-average asset allocations (as a percent)	0.00%
International | Insurance
Defined benefit plan, Disclosure
Weighted-average plan asset allocation (as a percent)		3.50%	2.30%
International | Insurance | Forecast/Estimate
Target asset allocation next fiscal year (%)
Target weighted-average asset allocations (as a percent)	3.50%
Bank | International
Defined benefit plan, Disclosure
Weighted-average plan asset allocation (as a percent)		100.00%	100.00%
Bank | International | Forecast/Estimate
Target asset allocation next fiscal year (%)
Target weighted-average asset allocations (as a percent)	100.00%
Bank | International | Cash and cash equivalents
Defined benefit plan, Disclosure
Weighted-average plan asset allocation (as a percent)		5.10%	2.90%
Bank | International | Cash and cash equivalents | Forecast/Estimate
Target asset allocation next fiscal year (%)
Target weighted-average asset allocations (as a percent)	1.10%
Bank | International | Debt securities
Defined benefit plan, Disclosure
Weighted-average plan asset allocation (as a percent)		89.40%	92.90%
Bank | International | Debt securities | Forecast/Estimate
Target asset allocation next fiscal year (%)
Target weighted-average asset allocations (as a percent)	91.70%
Bank | International | Equity securities
Defined benefit plan, Disclosure
Weighted-average plan asset allocation (as a percent)		4.50%	2.60%
Bank | International | Equity securities | Forecast/Estimate
Target asset allocation next fiscal year (%)
Target weighted-average asset allocations (as a percent)	3.70%
Bank | International | Alternative investments
Defined benefit plan, Disclosure
Weighted-average plan asset allocation (as a percent)		2.50%	0.70%
Bank | International | Insurance
Defined benefit plan, Disclosure
Weighted-average plan asset allocation (as a percent)		3.50%	2.30%
Bank | International | Insurance | Forecast/Estimate
Target asset allocation next fiscal year (%)
Target weighted-average asset allocations (as a percent)	3.50%

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- Definition

Percentage of target investment allocation to total plan assets. Includes, but is not limited to, percentage on weighted-average basis if more than one plan.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 55
-Paragraph 17
-URI https://asc.fasb.org/extlink&oid=123450688&loc=d3e4179-114921

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (d)(i)
-URI https://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920

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Percentage of actual investment allocation to total plan assets. Includes, but is not limited to, percentage on weighted-average basis if more than one plan.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (d)(i)
-URI https://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920

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