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Tax - Income statement related/reconciliation of tax rate (Details) - CHF (SFr)
SFr in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Income from continuing operations before taxes (CHF)      
Switzerland SFr 6,689 SFr 543 SFr 1,659
Foreign (9,949) (3,874) (1,750)
Income/(loss) before taxes (3,260) (3,331) (91)
Current and deferred taxes      
Switzerland 123 296 302
Foreign 451 (95) 472
Current income tax expense 574 201 774
Switzerland 37 73 156
Foreign 243 3,699 8
Deferred income tax expense 280 3,772 164
Income tax expense 854 3,973 938
Income tax expense/(benefit) reported in shareholder's equity related to:      
Other comprehensive income gains losses on own credit (675) 876 12
Gains/(losses) on cash flow hedges 66 (266) (62)
Cumulative translation adjustment 1 (7) 4
Unrealized gains/(losses) on securities 6 (9) (4)
Actuarial gains/(losses), Tax (30) (84) 0
Reconciliation of taxes computed at the Swiss statutory rate      
Income tax expense computed at the statutory tax rate (603) (616) (17)
Increase/(decrease) in income taxes resulting from:      
Effective Income Tax Rate Reconciliation, Foreign Income Tax Rate Differential, Amount (701) (127) 92
of which total foreign tax expense 694 3,604 480
Changes in tax law and rates 44 24 (29)
Non-deductible amortization of other intangible assets and goodwill impairment 12 0 (181)
Other non-deductible expenses 1,109 303 369
of which non-deductible interest expenses 844 196 200
of which non-deductible bank levy costs and other non-deductible compensation expenses 6 8 39
of which non-deductible expenses or non-deductible provision accruals 107 154 93
of which tax benefit from reassessment of interest cost deductibility relating to previously unrecognized tax benefits of non-deductible funds   (138)  
of which non-deductible other expenses 136 74 28
of which contingency accrual relating to non-deductible interest expense     (11)
Additional taxable income 1,322 5 15
of which recognition of the legacy deferred intercompany gain 705    
of which impact of the surrender of non-taxable life insurance policies 617    
Lower taxed income (108) (144) (129)
of which tax benefit in respect to non-taxable dividend income 44 39 41
of which tax benefit related non-taxable life insurance income   65 77
of which exempt income     5
of which concessionary and lower taxed income   36 5
(Income)/loss taxable to non-controlling interests 1 11 12
Changes in deferred tax valuation allowance (528) 4,512 612
Increase in deferred tax valuation allowance 204 40  
Change in recognition of outside basis difference 41 (2) 3
(Windfall tax benefits)/shortfall tax charges on share-based compensation 65 82 37
Other 200 (75) 154
of which tax expense or benefit relating to the (establishment) or release of tax contingency accruals 62    
of which tax (benefit)/charge from the impact of prior year adjustments (46) (172) (30)
of which tax impact of transitional adjustments arising from adoption of new accounting standards   45 51
of which withholding taxes     100
of which unrealized mark-to-marked results on share-based compensation   24  
of which tax credit (29) (24)  
of which fair value changes on investments 39    
of which impact of write down of additional tier 1 capital notes 15    
of which reassessment of Credit Suisse deferred tax assets/(liabilities) impacted by the acquisition of Credit Suisse Group AG by UBS (34)    
Income tax expense 854 3,973 938
Current Period      
Increase/(decrease) in income taxes resulting from:      
of which US Base Erosion and Anti-abuse Tax   57 29
Prior period      
Increase/(decrease) in income taxes resulting from:      
of which US Base Erosion and Anti-abuse Tax 165    
US      
Increase/(decrease) in income taxes resulting from:      
of which tax benefit related to non taxable gain in liquidation 63    
of which re-assessment of deferred tax assets in Switzerland reflecting changes in forecasted future profitability   3,655  
Switzerland      
Income from continuing operations before taxes (CHF)      
Income/(loss) before taxes SFr 6,689 543 1,659
Reconciliation of taxes computed at the Swiss statutory rate      
Swiss statutory rate (as a percent) 18.50%    
UK      
Increase/(decrease) in income taxes resulting from:      
Changes in deferred tax valuation allowance     771
US and Switzerland      
Increase/(decrease) in income taxes resulting from:      
of which releases of valuation allowances due to the change in corporation tax rates SFr (2,267)    
US, UK and Switzerland      
Increase/(decrease) in income taxes resulting from:      
of which re-assessment of deferred tax assets in Switzerland reflecting changes in forecasted future profitability   817  
UK, US, Singapore, Korea, Spain, Japan and Hong Kong      
Increase/(decrease) in income taxes resulting from:      
of which re-assessment of deferred tax assets in Switzerland reflecting changes in forecasted future profitability 1,535    
Switzerland, Hong Kong      
Increase/(decrease) in income taxes resulting from:      
Changes in deferred tax valuation allowance     (159)
Asia Pacific      
Income from continuing operations before taxes (CHF)      
Income/(loss) before taxes SFr (2,746) SFr (1,341) SFr 230