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Share-based awards (Details 3) - CHF (SFr)
SFr / shares in Units, shares in Millions, SFr in Millions
 2 Months Ended 12 Months Ended
Feb. 15, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Total estimated unrecognized compensation expense   SFr 953    
Performance shares | Performance share awards        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based Compensation Arrangement by Share-based Payment Award, Terms of Award   Managing directors and all material risk takers and controllers (employees whose activities are considered to have a potentially material impact on the Group's risk profile) received a portion of their deferred variable compensation in the form of performance share awards. Performance share awards are similar to share awards, except that the full balance of outstanding performance share awards, including those awarded in prior years, are subject to performance-based malus provisions. Performance share awards granted from 2016 and onward are subject to a negative adjustment in the event of a divisional loss by the division in which the employees worked as of December 31, 2018, or a negative ROE of the Group, whichever results in a larger adjustment. For employees in corporate functions and the Strategic Resolution Unit, the negative adjustment only applies in the event of a negative ROE of the Group and is not linked to the performance of the divisions. The basis for the ROE calculation may vary from year to year, depending on the Compensation Committee's determination for the year in which the performance shares are granted.    
Method of Measuring Cost of Award   Includes an adjustment for performance share awards granted in the second quarter of 2017 to compensate for the proportionate dilution of Group shares resulting from the rights offering approved on May 18, 2017. The number of deferred share-based awards held by each individual was increased by 3.64%. The terms and conditions of the adjusted shares were the same as the existing share-based awards, thereby ensuring that holders of the awards were neither advantaged nor disadvantaged by the additional performance shares granted.    
Total estimated unrecognized compensation expense   SFr 167    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]        
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value, Beginning Balance SFr 16.33 SFr 15.88 SFr 19.11 SFr 21.01
Weighted-average grant-date fair value - Granted (in CHF per share)   16.98 14.41 18.62
Weighted-average grant-date fair value - Settled (in CHF per share)   16.07 20.41 22.67
Weighted-average grant-date fair value - Forfeited (in CHF per share)   16.26 16.38 19.64
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value, Ending Balance   SFr 16.33 SFr 15.88 SFr 19.11
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]        
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding, Number, Beginning Balance 51.7 54.2 48.4 55.9
Granted (in shares)   26.5 31.8 21.4
Settled (in shares)   (26.3) (23.9) (26.5)
Forfeited (in shares)   (2.7) (2.1) (2.4)
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding, Number, Ending Balance   51.7 54.2 48.4
of which vested (in shares)   5.4 6.7 6.8
of which unvested (in shares)   46.3 47.5 41.6
Performance shares | Performance share awards | Grant Date, February 2019 | Subsequent Event [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Value of awards at grant SFr 532      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]        
Weighted-average grant-date fair value - Granted (in CHF per share) SFr 11.75      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]        
Granted (in shares) 46.1      
Performance shares | Performance share awards | Grant Date, February 2019 | Subsequent Event [Member] | Forecast/Estimate        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Total estimated unrecognized compensation expense SFr 521      
Performance shares | Performance share awards | Grant Date, 2018        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Value of awards at grant   SFr 478    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]        
Weighted-average grant-date fair value - Granted (in CHF per share)   SFr 17.22    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]        
Granted (in shares)   26.5    
Performance shares | Performance share awards | Grant Date, 2017        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Value of awards at grant     SFr 451  
Method of Measuring Cost of Award   The number of performance share awards granted to employees was generally determined by dividing the deferred component of variable compensation being granted as performance share awards by the average price of a Group share over the ten consecutive trading days ended February 28, 2019. The fair value of each performance share award was CHF 11.75, the Group share price on the grant date. The majority of performance share awards granted include the right to receive dividend equivalents on vested shares.    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]        
Weighted-average grant-date fair value - Granted (in CHF per share)     SFr 15.42  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]        
Granted (in shares)     29.7  
Stock compensation plan | Share awards        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based Compensation Arrangement by Share-based Payment Award, Terms of Award   Share awards granted in February 2019 are similar to those granted in February 2018. Each share award granted entitles the holder of the award to receive one Group share, subject to service conditions. Share awards vest over three years with one third of the share awards vesting on each of the three anniversaries of the grant date (ratable vesting), with the exception of awards granted to individuals classified as risk managers or senior managers under the UK PRA Remuneration Code or similar regulations in other jurisdictions. Share awards granted to risk managers vest over five years with one fifth of the award vesting on each of the five anniversaries of the grant date, while share awards granted to senior managers vest over five years commencing on the third anniversary of the grant date, with one fifth of the award vesting on each of the third to seventh anniversaries of the grant date. Share awards are expensed over the service period of the awards. The value of the share awards is solely dependent on the Group share price at the time of delivery.    
Vesting period   3 years    
Method of Measuring Cost of Award   Includes an adjustment for share awards granted in the second quarter of 2017 to compensate for the proportionate dilution of Group shares resulting from the rights offering approved on May 18, 2017. The number of deferred share-based awards held by each individual was increased by 3.64%. The terms and conditions of the adjusted shares were the same as the existing share-based awards, thereby ensuring that holders of the awards were neither advantaged nor disadvantaged by the additional shares granted.    
Total estimated unrecognized compensation expense   SFr 466    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]        
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value, Beginning Balance SFr 16.15 SFr 15.73 SFr 18.77 SFr 21.58
Weighted-average grant-date fair value - Granted (in CHF per share)   16.91 14.53 17.47
Weighted-average grant-date fair value - Settled (in CHF per share)   16.09 19.74 22.64
Weighted-average grant-date fair value - Forfeited (in CHF per share)   16.24 16.47 21.87
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value, Ending Balance   SFr 16.15 SFr 15.73 SFr 18.77
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]        
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding, Number, Beginning Balance 83.2 84.9 73.2 80.3
Granted (in shares)   43.8 54.3 39.7
Settled (in shares)   (40.7) (38.2) (37.7)
Forfeited (in shares)   (4.8) (4.4) (9.1)
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding, Number, Ending Balance   83.2 84.9 73.2
of which vested (in shares)   8.6 8.5 8.1
of which unvested (in shares)   74.6 76.4 65.1
Stock compensation plan | Share awards | Grant Date, February 2019 | Subsequent Event [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Value of awards at grant SFr 638      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]        
Weighted-average grant-date fair value - Granted (in CHF per share) SFr 11.75      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]        
Granted (in shares) 55.6      
Stock compensation plan | Share awards | Grant Date, February 2019 | Subsequent Event [Member] | Forecast/Estimate        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Total estimated unrecognized compensation expense SFr 629      
Stock compensation plan | Share awards | Grant Date, 2018        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Value of awards at grant   SFr 613    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]        
Weighted-average grant-date fair value - Granted (in CHF per share)   SFr 17.22    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]        
Granted (in shares)   34.1    
Stock compensation plan | Share awards | Grant Date, 2017        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Value of awards at grant     SFr 566  
Method of Measuring Cost of Award   The number of share awards granted to employees was generally determined by dividing the deferred component of variable compensation being granted as share awards by the average price of a Group share over the ten consecutive trading days ended February 28, 2019. The fair value of each share award was CHF 11.75, the Group share price on the grant date. The majority of share awards granted include the right to receive dividend equivalents on vested shares.    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]        
Weighted-average grant-date fair value - Granted (in CHF per share)     SFr 15.42  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]        
Granted (in shares)     37.8  
Stock compensation plan | Share awards | UK PRA staff or similuar regulations, Risk takers        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vesting period   5 years    
Stock compensation plan | Share awards | UK PRA staff or similuar regulations, Senior managemement        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vesting period   7 years    
Stock compensation plan | Contingent Capital share awards        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Method of Measuring Cost of Award   Includes an adjustment for Contingent Capital share awards granted in the second quarter of 2017 to compensate for the proportionate dilution of Group shares resulting from the rights offering approved on May 18, 2017. The number of deferred share-based awards held by each individual was increased by 3.64%. The terms and conditions of the adjusted shares were the same as the existing share-based awards, thereby ensuring that holders of the awards were neither advantaged nor disadvantaged by the additional Contingent Capital shares granted.    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]        
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding, Number, Beginning Balance 3.4 8.4 13.5  
Granted (in shares)   0.0 0.3 16.4
Settled (in shares)   (4.9) (5.0) (2.6)
Forfeited (in shares)   (0.1) (0.4) (0.3)
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding, Number, Ending Balance   3.4 8.4 13.5
of which vested (in shares)   0.7 1.3 1.0
of which unvested (in shares)   2.7 7.1 12.5
Stock compensation plan | Contingent Capital share awards | Grant Date, February 2019 | Subsequent Event [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Value of awards at grant SFr 299      
Stock compensation plan | Contingent Capital share awards | Grant Date, February 2019 | Subsequent Event [Member] | Forecast/Estimate        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Total estimated unrecognized compensation expense 273      
Stock compensation plan | Contingent Capital share awards | Grant Date, 2018        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Value of awards at grant   SFr 241    
Stock compensation plan | Contingent Capital share awards | Grant Date, 2017        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Value of awards at grant     SFr 229  
Stock compensation plan | Special awards and blocked shares        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based Compensation Arrangement by Share-based Payment Award, Terms of Award   The Group's share awards include other awards, such as blocked shares and special awards, which may be granted to new employees. Other share awards entitle the holder to receive one Group share and are generally subject to continued employment with the Group, contain restrictive covenants and cancellation provisions and generally vest between zero and five years.    
Stock compensation plan | Special awards and blocked shares | Minimum        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vesting period   0 years    
Stock compensation plan | Special awards and blocked shares | Maximum        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vesting period   5 years    
Stock compensation plan | European Union and blocked share awards        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based Compensation Arrangement by Share-based Payment Award, Terms of Award   In order to comply with Capital Requirements Directive IV requirements, employees who hold key roles in respect of certain Group subsidiaries receive shares that are subject to transfer restrictions for 50% of the amount that would have been paid to them in cash. These shares are vested at the time of grant but remain blocked, that is, subject to transfer restrictions, for six months to three years from the date of grant, depending on the location.    
Stock compensation plan | European Union and blocked share awards | Minimum        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vesting period   6 months    
Stock compensation plan | European Union and blocked share awards | Maximum        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vesting period   3 years    
Stock compensation plan | European Union and blocked share awards | Grant Date, February 2019 | Subsequent Event [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Value of awards at grant SFr 35      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]        
Granted (in shares) 3.0      
Stock compensation plan | European Union and blocked share awards | Grant Date, 2018        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Value of awards at grant   SFr 38    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]        
Granted (in shares)   2.1    
Stock compensation plan | European Union and blocked share awards | Grant Date, 2017        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Value of awards at grant     SFr 37  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]        
Granted (in shares)     2.5  
Bank        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Total estimated unrecognized compensation expense   SFr 912    
Bank | Performance shares | Performance share awards        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Method of Measuring Cost of Award   Includes an adjustment for performance share awards granted in the second quarter of 2017 to compensate for the proportionate dilution of Group shares resulting from the rights offering approved on May 18, 2017. The number of deferred share-based awards held by each individual was increased by 3.64%. The terms and conditions of the adjusted shares were the same as the existing share-based awards, thereby ensuring that holders of the awards were neither advantaged nor disadvantaged by the additional performance shares granted.    
Total estimated unrecognized compensation expense   SFr 161    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]        
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value, Beginning Balance SFr 16.33 SFr 15.88 SFr 19.12 SFr 21.01
Weighted-average grant-date fair value - Granted (in CHF per share)   16.98 14.41 18.62
Weighted-average grant-date fair value - Settled (in CHF per share)   16.07 20.41 22.66
Weighted-average grant-date fair value - Forfeited (in CHF per share)   16.26 16.37 18.98
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value, Ending Balance   SFr 16.33 SFr 15.88 SFr 19.12
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]        
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding, Number, Beginning Balance 50.0 52.8 48.1 55.5
Granted (in shares)   25.6 31.1 21.3
Settled (in shares)   (25.6) (23.6) (26.4)
Forfeited (in shares)   (2.8) (2.8) (2.3)
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding, Number, Ending Balance   50.0 52.8 48.1
of which vested (in shares)   5.2 6.6 6.8
of which unvested (in shares)   44.8 46.2 41.3
Bank | Performance shares | Performance share awards | Grant Date, February 2019 | Subsequent Event [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Value of awards at grant SFr 515      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]        
Granted (in shares) 44.6      
Bank | Performance shares | Performance share awards | Grant Date, February 2019 | Subsequent Event [Member] | Forecast/Estimate        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Total estimated unrecognized compensation expense SFr 505      
Bank | Performance shares | Performance share awards | Grant Date, 2018        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Value of awards at grant   SFr 462    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]        
Granted (in shares)   25.6    
Bank | Performance shares | Performance share awards | Grant Date, 2017        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Value of awards at grant     SFr 449  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]        
Granted (in shares)     29.6  
Bank | Stock compensation plan | Share awards        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Method of Measuring Cost of Award   Includes an adjustment for share awards granted in the second quarter of 2017 to compensate for the proportionate dilution of Group shares resulting from the rights offering approved on May 18, 2017. The number of deferred share-based awards held by each individual was increased by 3.64%. The terms and conditions of the adjusted shares were the same as the existing share-based awards, thereby ensuring that holders of the awards were neither advantaged nor disadvantaged by the additional shares granted.    
Total estimated unrecognized compensation expense   SFr 455    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]        
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value, Beginning Balance SFr 16.23 SFr 15.77 SFr 18.78 SFr 21.56
Weighted-average grant-date fair value - Granted (in CHF per share)   16.97 14.54 17.59
Weighted-average grant-date fair value - Settled (in CHF per share)   16.02 19.75 22.68
Weighted-average grant-date fair value - Forfeited (in CHF per share)   16.33 16.47 21.88
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value, Ending Balance   SFr 16.23 SFr 15.77 SFr 18.78
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]        
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding, Number, Beginning Balance 77.1 79.9 70.8 79.0
Granted (in shares)   40.5 51.5 38.1
Settled (in shares)   (39.0) (36.8) (37.2)
Forfeited (in shares)   (4.3) (5.6) (9.1)
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding, Number, Ending Balance   77.1 79.9 70.8
of which vested (in shares)   8.4 7.8 8.1
of which unvested (in shares)   68.7 72.1 62.7
Bank | Stock compensation plan | Share awards | Grant Date, February 2019 | Subsequent Event [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Value of awards at grant SFr 620      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]        
Granted (in shares) 54.0      
Bank | Stock compensation plan | Share awards | Grant Date, February 2019 | Subsequent Event [Member] | Forecast/Estimate        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Total estimated unrecognized compensation expense SFr 611      
Bank | Stock compensation plan | Share awards | Grant Date, 2018        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Value of awards at grant   SFr 596    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]        
Granted (in shares)   33.1    
Bank | Stock compensation plan | Share awards | Grant Date, 2017        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Value of awards at grant     SFr 563  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]        
Granted (in shares)     37.6  
Bank | Stock compensation plan | Contingent Capital share awards        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Method of Measuring Cost of Award   Includes an adjustment for Contingent Capital share awards granted in the second quarter of 2017 to compensate for the proportionate dilution of Group shares resulting from the rights offering approved on May 18, 2017. The number of deferred share-based awards held by each individual was increased by 3.64%. The terms and conditions of the adjusted shares were the same as the existing share-based awards, thereby ensuring that holders of the awards were neither advantaged nor disadvantaged by the additional Contingent Capital shares granted.    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]        
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding, Number, Beginning Balance 2.7 7.5 12.8  
Granted (in shares)   0.0 0.3 15.6
Settled (in shares)   (4.6) (4.9) (2.5)
Forfeited (in shares)   (0.2) (0.7) (0.3)
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding, Number, Ending Balance   2.7 7.5 12.8
of which vested (in shares)   0.7 1.3 1.0
of which unvested (in shares)   2.0 6.2 11.8
Bank | Stock compensation plan | Contingent Capital share awards | Grant Date, February 2019 | Subsequent Event [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Value of awards at grant SFr 289      
Bank | Stock compensation plan | Contingent Capital share awards | Grant Date, February 2019 | Subsequent Event [Member] | Forecast/Estimate        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Total estimated unrecognized compensation expense 264      
Bank | Stock compensation plan | Contingent Capital share awards | Grant Date, 2018        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Value of awards at grant   SFr 233    
Bank | Stock compensation plan | Contingent Capital share awards | Grant Date, 2017        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Value of awards at grant     SFr 228  
Bank | Stock compensation plan | European Union and blocked share awards | Grant Date, February 2019 | Subsequent Event [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Value of awards at grant SFr 31      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]        
Granted (in shares) 2.7      
Bank | Stock compensation plan | European Union and blocked share awards | Grant Date, 2018        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Value of awards at grant   SFr 35    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]        
Granted (in shares)   1.9    
Bank | Stock compensation plan | European Union and blocked share awards | Grant Date, 2017        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Value of awards at grant     SFr 37  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]        
Granted (in shares)     2.4