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FI - Quantitative information about level 3 assets at fair value (Details 14)
SFr in Millions, Pure in Millions
Jun. 30, 2020
CHF (SFr)
Mar. 31, 2020
CHF (SFr)
Dec. 31, 2019
CHF (SFr)
Assets      
Cash and Due from Banks SFr 368 SFr 367 SFr 356
Central bank funds sold, securities purchased under resale agreements and securities borrowing transactions 78,448 88,511 85,556
Securities received as collateral 42,479 28,655 40,219
Trading assets 156,730 150,798 153,797
Available-for-sale Securities, Debt Securities 489 1,068 1,006
Other investments 3,733 3,791 3,550
Loans 13,231 14,273 12,662
Other intangible assets (mortgage servicing rights), at fair value 209 220 244
Other assets 9,321 SFr 11,955 10,402
Recurring basis      
Assets      
Cash and Due from Banks 368   356
Central bank funds sold, securities purchased under resale agreements and securities borrowing transactions 78,448   85,556
Securities received as collateral 42,479   40,219
Trading assets 156,730   153,797
Available-for-sale Securities, Debt Securities 489   1,006
Other investments 3,733   3,550
Loans 13,231   12,662
Loans - of which commercial and industrial 5,097   3,774
Loans - of which financial institutions 4,903   4,931
Loans - of which government and public institutions 2,427   3,031
Other intangible assets (mortgage servicing rights), at fair value 209   244
Other assets 9,321   10,402
Other assets - of which loans held-for-sale 6,725   8,213
Total assets at fair value 305,008   307,792
Recurring basis | Other equity investments      
Assets      
Other investments 2,301   2,081
Recurring basis | Life finance instruments      
Assets      
Other investments 1,067   1,052
Recurring basis | Debt securities      
Assets      
Trading assets 70,962   66,994
Recurring basis | Debt securities | Debt securities issued by foreign governments      
Assets      
Trading assets 27,118   26,963
Recurring basis | Debt securities | Corporate debt securities      
Assets      
Trading assets 11,114   12,049
Recurring basis | Debt securities | RMBS      
Assets      
Trading assets 29,479   23,516
Recurring basis | Equity securities      
Assets      
Trading assets 55,232   64,542
Recurring basis | Derivative instruments      
Assets      
Trading assets 25,834   17,731
Recurring basis | Other      
Assets      
Trading assets 4,702   4,530
Recurring basis | Level 3      
Assets      
Cash and Due from Banks 0   0
Central bank funds sold, securities purchased under resale agreements and securities borrowing transactions 0   0
Securities received as collateral 170   1
Trading assets 8,797   7,885
Available-for-sale Securities, Debt Securities 0   0
Other investments 2,839   2,523
Loans 3,513   3,717
Loans - of which commercial and industrial 1,473   1,283
Loans - of which financial institutions 1,100   1,201
Loans - of which government and public institutions 447   831
Other intangible assets (mortgage servicing rights), at fair value 209   244
Other assets 2,581   1,846
Other assets - of which loans held-for-sale 2,304   1,619
Total assets at fair value 18,109   16,216
Recurring basis | Level 3 | Valuation Technique, Discounted Cash Flow [Member]      
Assets      
Loans - of which commercial and industrial 912   996
Loans - of which financial institutions SFr 923   SFr 984
Loans - of which government and public institutions, measurement input 277   468
Other assets - of which loans held-for-sale SFr 323   SFr 501
Recurring basis | Level 3 | Valuation Technique, Discounted Cash Flow [Member] | Measurement Input, Credit Spread [Member] | Minimum      
Assets      
Loans - of which commercial and industrial, measurement input 99   96
Loans - of which financial institutions, measurement input 151   111
Loans - of which government and public institutions, measurement input 625   457
Other assets - of which loans held-for-sale, measurement input 117   117
Recurring basis | Level 3 | Valuation Technique, Discounted Cash Flow [Member] | Measurement Input, Credit Spread [Member] | Maximum      
Assets      
Loans - of which commercial and industrial, measurement input 2,243   1,484
Loans - of which financial institutions, measurement input 2,011   1,261
Loans - of which government and public institutions, measurement input 866   526
Other assets - of which loans held-for-sale, measurement input 651   381
Recurring basis | Level 3 | Valuation Technique, Discounted Cash Flow [Member] | Measurement Input, Credit Spread [Member] | Weighted average      
Assets      
Loans - of which commercial and industrial, measurement input 944   654
Loans - of which financial institutions, measurement input 692   412
Loans - of which government and public institutions, measurement input 712   500
Other assets - of which loans held-for-sale, measurement input 385   243
Recurring basis | Level 3 | Valuation Technique, Discounted Cash Flow [Member] | Measurement Input, Recovery rate [Member] | Minimum      
Assets      
Loans - of which commercial and industrial, measurement input 25   25
Loans - of which financial institutions, measurement input 25   25
Loans - of which government and public institutions, measurement input 25   25
Other assets - of which loans held-for-sale, measurement input 0   0
Recurring basis | Level 3 | Valuation Technique, Discounted Cash Flow [Member] | Measurement Input, Recovery rate [Member] | Maximum      
Assets      
Loans - of which commercial and industrial, measurement input 40   25
Loans - of which financial institutions, measurement input 40   25
Loans - of which government and public institutions, measurement input 25   40
Other assets - of which loans held-for-sale, measurement input 40   1
Recurring basis | Level 3 | Valuation Technique, Discounted Cash Flow [Member] | Measurement Input, Recovery rate [Member] | Weighted average      
Assets      
Loans - of which commercial and industrial, measurement input 29   25
Loans - of which financial institutions, measurement input 26   25
Loans - of which government and public institutions, measurement input 25   30
Other assets - of which loans held-for-sale, measurement input 24   1
Recurring basis | Level 3 | Market comparable      
Assets      
Loans - of which commercial and industrial SFr 437   SFr 273
Loans - of which financial institutions SFr 167   SFr 135
Loans - of which government and public institutions, measurement input 157   166
Other assets - of which loans held-for-sale SFr 1,945   SFr 1,026
Recurring basis | Level 3 | Market comparable | Measurement Input, Price Volatility [Member] | Minimum      
Assets      
Loans - of which commercial and industrial, measurement input 10   0
Loans - of which financial institutions, measurement input 12   16
Loans - of which government and public institutions, measurement input 62   62
Other assets - of which loans held-for-sale, measurement input 0   0
Recurring basis | Level 3 | Market comparable | Measurement Input, Price Volatility [Member] | Maximum      
Assets      
Loans - of which commercial and industrial, measurement input 100   99
Loans - of which financial institutions, measurement input 100   100
Loans - of which government and public institutions, measurement input 62   62
Other assets - of which loans held-for-sale, measurement input 130   180
Recurring basis | Level 3 | Market comparable | Measurement Input, Price Volatility [Member] | Weighted average      
Assets      
Loans - of which commercial and industrial, measurement input 66   64
Loans - of which financial institutions, measurement input 41   36
Loans - of which government and public institutions, measurement input 62   62
Other assets - of which loans held-for-sale, measurement input 88   91
Recurring basis | Level 3 | Other equity investments      
Assets      
Other investments SFr 1,765   SFr 1,463
Recurring basis | Level 3 | Life finance instruments      
Assets      
Other investments 1,066   1,052
Recurring basis | Level 3 | Debt securities      
Assets      
Trading assets 3,198   1,923
Recurring basis | Level 3 | Debt securities | Debt securities issued by foreign governments      
Assets      
Trading assets SFr 163   SFr 198
Recurring basis | Level 3 | Debt securities | Debt securities issued by foreign governments | Valuation Technique, Discounted Cash Flow [Member] | Measurement Input, Credit Spread [Member] | Minimum      
Assets      
Trading assets, measurement input 76   140
Recurring basis | Level 3 | Debt securities | Debt securities issued by foreign governments | Valuation Technique, Discounted Cash Flow [Member] | Measurement Input, Credit Spread [Member] | Maximum      
Assets      
Trading assets, measurement input 76   140
Recurring basis | Level 3 | Debt securities | Debt securities issued by foreign governments | Valuation Technique, Discounted Cash Flow [Member] | Measurement Input, Credit Spread [Member] | Weighted average      
Assets      
Trading assets, measurement input 76   140
Recurring basis | Level 3 | Debt securities | Corporate debt securities      
Assets      
Trading assets SFr 1,642   SFr 1,128
Recurring basis | Level 3 | Debt securities | Corporate debt securities | Option model      
Assets      
Trading assets 622   SFr 913
Recurring basis | Level 3 | Debt securities | Corporate debt securities | Valuation Technique, Discounted Cash Flow [Member]      
Assets      
Trading assets SFr 509    
Recurring basis | Level 3 | Debt securities | Corporate debt securities | Valuation Technique, Discounted Cash Flow [Member] | Measurement Input, Credit Spread [Member] | Minimum      
Assets      
Trading assets, measurement input (7)    
Recurring basis | Level 3 | Debt securities | Corporate debt securities | Valuation Technique, Discounted Cash Flow [Member] | Measurement Input, Credit Spread [Member] | Maximum      
Assets      
Trading assets, measurement input 1,558    
Recurring basis | Level 3 | Debt securities | Corporate debt securities | Valuation Technique, Discounted Cash Flow [Member] | Measurement Input, Credit Spread [Member] | Weighted average      
Assets      
Trading assets, measurement input 606    
Recurring basis | Level 3 | Debt securities | Corporate debt securities | Valuation Technique, Option Pricing Model [Member] | Measurement Input, Correlation [Member] | Minimum      
Assets      
Trading assets, measurement input (50)   (60)
Recurring basis | Level 3 | Debt securities | Corporate debt securities | Valuation Technique, Option Pricing Model [Member] | Measurement Input, Correlation [Member] | Maximum      
Assets      
Trading assets, measurement input 93   100
Recurring basis | Level 3 | Debt securities | Corporate debt securities | Valuation Technique, Option Pricing Model [Member] | Measurement Input, Correlation [Member] | Weighted average      
Assets      
Trading assets, measurement input 42   63
Recurring basis | Level 3 | Debt securities | Corporate debt securities | Valuation Technique, Option Pricing Model [Member] | Measurement Input, Gap risk [Member] | Minimum      
Assets      
Trading assets, measurement input 0   0
Recurring basis | Level 3 | Debt securities | Corporate debt securities | Valuation Technique, Option Pricing Model [Member] | Measurement Input, Gap risk [Member] | Maximum      
Assets      
Trading assets, measurement input 2   2
Recurring basis | Level 3 | Debt securities | Corporate debt securities | Valuation Technique, Option Pricing Model [Member] | Measurement Input, Gap risk [Member] | Weighted average      
Assets      
Trading assets, measurement input 0   0
Recurring basis | Level 3 | Debt securities | Corporate debt securities | Valuation Technique, Option Pricing Model [Member] | Measurement Input, Recovery rate [Member] | Minimum      
Assets      
Trading assets, measurement input 40    
Recurring basis | Level 3 | Debt securities | Corporate debt securities | Valuation Technique, Option Pricing Model [Member] | Measurement Input, Recovery rate [Member] | Maximum      
Assets      
Trading assets, measurement input 40    
Recurring basis | Level 3 | Debt securities | Corporate debt securities | Valuation Technique, Option Pricing Model [Member] | Measurement Input, Recovery rate [Member] | Weighted average      
Assets      
Trading assets, measurement input 40    
Recurring basis | Level 3 | Debt securities | Corporate debt securities | Valuation Technique, Option Pricing Model [Member] | Measurement Input, Volatility [Member] | Minimum      
Assets      
Trading assets, measurement input 0   0
Recurring basis | Level 3 | Debt securities | Corporate debt securities | Valuation Technique, Option Pricing Model [Member] | Measurement Input, Volatility [Member] | Maximum      
Assets      
Trading assets, measurement input 213   275
Recurring basis | Level 3 | Debt securities | Corporate debt securities | Valuation Technique, Option Pricing Model [Member] | Measurement Input, Volatility [Member] | Weighted average      
Assets      
Trading assets, measurement input 27   27
Recurring basis | Level 3 | Debt securities | Corporate debt securities | Vendor price      
Assets      
Trading assets SFr 54    
Recurring basis | Level 3 | Debt securities | Corporate debt securities | Vendor price | Measurement Input, Price Volatility [Member] | Minimum      
Assets      
Trading assets, measurement input 0    
Recurring basis | Level 3 | Debt securities | Corporate debt securities | Vendor price | Measurement Input, Price Volatility [Member] | Maximum      
Assets      
Trading assets, measurement input 1,373    
Recurring basis | Level 3 | Debt securities | Corporate debt securities | Vendor price | Measurement Input, Price Volatility [Member] | Weighted average      
Assets      
Trading assets, measurement input 1    
Recurring basis | Level 3 | Debt securities | Corporate debt securities | Market comparable      
Assets      
Trading assets SFr 302   SFr 503
Recurring basis | Level 3 | Debt securities | Corporate debt securities | Market comparable | Measurement Input, Price Volatility [Member] | Minimum      
Assets      
Trading assets, measurement input 0   0
Recurring basis | Level 3 | Debt securities | Corporate debt securities | Market comparable | Measurement Input, Price Volatility [Member] | Maximum      
Assets      
Trading assets, measurement input 207   129
Recurring basis | Level 3 | Debt securities | Corporate debt securities | Market comparable | Measurement Input, Price Volatility [Member] | Weighted average      
Assets      
Trading assets, measurement input 104   97
Recurring basis | Level 3 | Debt securities | RMBS      
Assets      
Trading assets SFr 1,102   SFr 317
Recurring basis | Level 3 | Debt securities | RMBS | Valuation Technique, Discounted Cash Flow [Member] | Measurement Input, Default Rate [Member] | Minimum      
Assets      
Trading assets, measurement input 0   0
Recurring basis | Level 3 | Debt securities | RMBS | Valuation Technique, Discounted Cash Flow [Member] | Measurement Input, Default Rate [Member] | Maximum      
Assets      
Trading assets, measurement input 14   12
Recurring basis | Level 3 | Debt securities | RMBS | Valuation Technique, Discounted Cash Flow [Member] | Measurement Input, Default Rate [Member] | Weighted average      
Assets      
Trading assets, measurement input 2   2
Recurring basis | Level 3 | Debt securities | RMBS | Valuation Technique, Discounted Cash Flow [Member] | Measurement Input, Discount Rate [Member] | Minimum      
Assets      
Trading assets, measurement input 1   1
Recurring basis | Level 3 | Debt securities | RMBS | Valuation Technique, Discounted Cash Flow [Member] | Measurement Input, Discount Rate [Member] | Maximum      
Assets      
Trading assets, measurement input 40   36
Recurring basis | Level 3 | Debt securities | RMBS | Valuation Technique, Discounted Cash Flow [Member] | Measurement Input, Discount Rate [Member] | Weighted average      
Assets      
Trading assets, measurement input 7   13
Recurring basis | Level 3 | Debt securities | RMBS | Valuation Technique, Discounted Cash Flow [Member] | Measurement Input, Loss Severity [Member] | Minimum      
Assets      
Trading assets, measurement input 0   0
Recurring basis | Level 3 | Debt securities | RMBS | Valuation Technique, Discounted Cash Flow [Member] | Measurement Input, Loss Severity [Member] | Maximum      
Assets      
Trading assets, measurement input 100   100
Recurring basis | Level 3 | Debt securities | RMBS | Valuation Technique, Discounted Cash Flow [Member] | Measurement Input, Loss Severity [Member] | Weighted average      
Assets      
Trading assets, measurement input 32   45
Recurring basis | Level 3 | Debt securities | RMBS | Valuation Technique, Discounted Cash Flow [Member] | Measurement Input, Prepayment Rate [Member] | Minimum      
Assets      
Trading assets, measurement input 0   2
Recurring basis | Level 3 | Debt securities | RMBS | Valuation Technique, Discounted Cash Flow [Member] | Measurement Input, Prepayment Rate [Member] | Maximum      
Assets      
Trading assets, measurement input 35   45
Recurring basis | Level 3 | Debt securities | RMBS | Valuation Technique, Discounted Cash Flow [Member] | Measurement Input, Prepayment Rate [Member] | Weighted average      
Assets      
Trading assets, measurement input 9   10
Recurring basis | Level 3 | Equity securities      
Assets      
Trading assets SFr 142   SFr 197
Recurring basis | Level 3 | Equity securities | Vendor price | Measurement Input, Price Volatility [Member] | Minimum      
Assets      
Trading assets, measurement input 0   0
Recurring basis | Level 3 | Equity securities | Vendor price | Measurement Input, Price Volatility [Member] | Maximum      
Assets      
Trading assets, measurement input 35,399   36,760
Recurring basis | Level 3 | Equity securities | Vendor price | Measurement Input, Price Volatility [Member] | Weighted average      
Assets      
Trading assets, measurement input 327   383
Recurring basis | Level 3 | Derivative instruments      
Assets      
Trading assets SFr 4,101   SFr 3,534
Recurring basis | Level 3 | Derivative instruments | Interest rate derivatives      
Assets      
Trading assets SFr 639   SFr 554
Recurring basis | Level 3 | Derivative instruments | Interest rate derivatives | Valuation Technique, Option Pricing Model [Member] | Measurement Input, Correlation [Member] | Minimum      
Assets      
Trading assets, measurement input (1)   0
Recurring basis | Level 3 | Derivative instruments | Interest rate derivatives | Valuation Technique, Option Pricing Model [Member] | Measurement Input, Correlation [Member] | Maximum      
Assets      
Trading assets, measurement input 100   100
Recurring basis | Level 3 | Derivative instruments | Interest rate derivatives | Valuation Technique, Option Pricing Model [Member] | Measurement Input, Correlation [Member] | Weighted average      
Assets      
Trading assets, measurement input 73   69
Recurring basis | Level 3 | Derivative instruments | Interest rate derivatives | Valuation Technique, Option Pricing Model [Member] | Measurement Input, Prepayment Rate [Member] | Minimum      
Assets      
Trading assets, measurement input 1   1
Recurring basis | Level 3 | Derivative instruments | Interest rate derivatives | Valuation Technique, Option Pricing Model [Member] | Measurement Input, Prepayment Rate [Member] | Maximum      
Assets      
Trading assets, measurement input 27   28
Recurring basis | Level 3 | Derivative instruments | Interest rate derivatives | Valuation Technique, Option Pricing Model [Member] | Measurement Input, Prepayment Rate [Member] | Weighted average      
Assets      
Trading assets, measurement input 9   10
Recurring basis | Level 3 | Derivative instruments | Interest rate derivatives | Valuation Technique, Option Pricing Model [Member] | Measurement Input, Volatility skew [Member] | Minimum      
Assets      
Trading assets, measurement input (3)   (4)
Recurring basis | Level 3 | Derivative instruments | Interest rate derivatives | Valuation Technique, Option Pricing Model [Member] | Measurement Input, Volatility skew [Member] | Maximum      
Assets      
Trading assets, measurement input 0   6
Recurring basis | Level 3 | Derivative instruments | Interest rate derivatives | Valuation Technique, Option Pricing Model [Member] | Measurement Input, Volatility skew [Member] | Weighted average      
Assets      
Trading assets, measurement input (2)   (1)
Recurring basis | Level 3 | Derivative instruments | Interest rate derivatives | Valuation Technique, Option Pricing Model [Member] | Measurement Input, Volatility [Member] | Minimum      
Assets      
Trading assets, measurement input (30)    
Recurring basis | Level 3 | Derivative instruments | Interest rate derivatives | Valuation Technique, Option Pricing Model [Member] | Measurement Input, Volatility [Member] | Maximum      
Assets      
Trading assets, measurement input 25    
Recurring basis | Level 3 | Derivative instruments | Interest rate derivatives | Valuation Technique, Option Pricing Model [Member] | Measurement Input, Volatility [Member] | Weighted average      
Assets      
Trading assets, measurement input (2)    
Recurring basis | Level 3 | Derivative instruments | Interest rate derivatives | Vendor price      
Assets      
Other investments SFr 857   SFr 857
Recurring basis | Level 3 | Derivative instruments | Foreign exchange derivatives      
Assets      
Trading assets SFr 138   SFr 152
Recurring basis | Level 3 | Derivative instruments | Foreign exchange derivatives | Valuation Technique, Option Pricing Model [Member] | Measurement Input, Correlation [Member] | Minimum      
Assets      
Trading assets, measurement input 5   5
Recurring basis | Level 3 | Derivative instruments | Foreign exchange derivatives | Valuation Technique, Option Pricing Model [Member] | Measurement Input, Correlation [Member] | Maximum      
Assets      
Trading assets, measurement input 70   70
Recurring basis | Level 3 | Derivative instruments | Foreign exchange derivatives | Valuation Technique, Option Pricing Model [Member] | Measurement Input, Correlation [Member] | Weighted average      
Assets      
Trading assets, measurement input 29   30
Recurring basis | Level 3 | Derivative instruments | Foreign exchange derivatives | Valuation Technique, Option Pricing Model [Member] | Measurement Input, Prepayment Rate [Member] | Minimum      
Assets      
Trading assets, measurement input 23   23
Recurring basis | Level 3 | Derivative instruments | Foreign exchange derivatives | Valuation Technique, Option Pricing Model [Member] | Measurement Input, Prepayment Rate [Member] | Maximum      
Assets      
Trading assets, measurement input 27   28
Recurring basis | Level 3 | Derivative instruments | Foreign exchange derivatives | Valuation Technique, Option Pricing Model [Member] | Measurement Input, Prepayment Rate [Member] | Weighted average      
Assets      
Trading assets, measurement input 25   25
Recurring basis | Level 3 | Derivative instruments | Equity/Index-related products      
Assets      
Trading assets SFr 1,067   SFr 1,040
Recurring basis | Level 3 | Derivative instruments | Equity/Index-related products | Valuation Technique, Option Pricing Model [Member] | Measurement Input, Buyback probability [Member] | Minimum      
Assets      
Trading assets, measurement input 50   50
Recurring basis | Level 3 | Derivative instruments | Equity/Index-related products | Valuation Technique, Option Pricing Model [Member] | Measurement Input, Buyback probability [Member] | Maximum      
Assets      
Trading assets, measurement input 100   100
Recurring basis | Level 3 | Derivative instruments | Equity/Index-related products | Valuation Technique, Option Pricing Model [Member] | Measurement Input, Buyback probability [Member] | Weighted average      
Assets      
Trading assets, measurement input 70   70
Recurring basis | Level 3 | Derivative instruments | Equity/Index-related products | Valuation Technique, Option Pricing Model [Member] | Measurement Input, Correlation [Member] | Minimum      
Assets      
Trading assets, measurement input (50)   (50)
Recurring basis | Level 3 | Derivative instruments | Equity/Index-related products | Valuation Technique, Option Pricing Model [Member] | Measurement Input, Correlation [Member] | Maximum      
Assets      
Trading assets, measurement input 93   100
Recurring basis | Level 3 | Derivative instruments | Equity/Index-related products | Valuation Technique, Option Pricing Model [Member] | Measurement Input, Correlation [Member] | Weighted average      
Assets      
Trading assets, measurement input 55   64
Recurring basis | Level 3 | Derivative instruments | Equity/Index-related products | Valuation Technique, Option Pricing Model [Member] | Measurement Input, Gap risk [Member] | Minimum      
Assets      
Trading assets, measurement input 0   0
Recurring basis | Level 3 | Derivative instruments | Equity/Index-related products | Valuation Technique, Option Pricing Model [Member] | Measurement Input, Gap risk [Member] | Maximum      
Assets      
Trading assets, measurement input 2   2
Recurring basis | Level 3 | Derivative instruments | Equity/Index-related products | Valuation Technique, Option Pricing Model [Member] | Measurement Input, Gap risk [Member] | Weighted average      
Assets      
Trading assets, measurement input 0   0
Recurring basis | Level 3 | Derivative instruments | Equity/Index-related products | Valuation Technique, Option Pricing Model [Member] | Measurement Input, Volatility [Member] | Minimum      
Assets      
Trading assets, measurement input (85)   0
Recurring basis | Level 3 | Derivative instruments | Equity/Index-related products | Valuation Technique, Option Pricing Model [Member] | Measurement Input, Volatility [Member] | Maximum      
Assets      
Trading assets, measurement input 213   275
Recurring basis | Level 3 | Derivative instruments | Equity/Index-related products | Valuation Technique, Option Pricing Model [Member] | Measurement Input, Volatility [Member] | Weighted average      
Assets      
Trading assets, measurement input 16   30
Recurring basis | Level 3 | Derivative instruments | Credit derivatives      
Assets      
Trading assets SFr 1,172   SFr 879
Recurring basis | Level 3 | Derivative instruments | Credit derivatives | Valuation Technique, Discounted Cash Flow [Member]      
Assets      
Trading assets SFr 1,026   SFr 691
Recurring basis | Level 3 | Derivative instruments | Credit derivatives | Valuation Technique, Discounted Cash Flow [Member] | Measurement Input, Credit Spread [Member] | Minimum      
Assets      
Trading assets, measurement input 0   2
Recurring basis | Level 3 | Derivative instruments | Credit derivatives | Valuation Technique, Discounted Cash Flow [Member] | Measurement Input, Credit Spread [Member] | Maximum      
Assets      
Trading assets, measurement input 3,286   1,033
Recurring basis | Level 3 | Derivative instruments | Credit derivatives | Valuation Technique, Discounted Cash Flow [Member] | Measurement Input, Credit Spread [Member] | Weighted average      
Assets      
Trading assets, measurement input 994   150
Recurring basis | Level 3 | Derivative instruments | Credit derivatives | Valuation Technique, Discounted Cash Flow [Member] | Measurement Input, Credit curve volatility [Member] | Minimum      
Assets      
Trading assets, measurement input 60    
Recurring basis | Level 3 | Derivative instruments | Credit derivatives | Valuation Technique, Discounted Cash Flow [Member] | Measurement Input, Credit curve volatility [Member] | Maximum      
Assets      
Trading assets, measurement input 103    
Recurring basis | Level 3 | Derivative instruments | Credit derivatives | Valuation Technique, Discounted Cash Flow [Member] | Measurement Input, Credit curve volatility [Member] | Weighted average      
Assets      
Trading assets, measurement input 89    
Recurring basis | Level 3 | Derivative instruments | Credit derivatives | Valuation Technique, Discounted Cash Flow [Member] | Measurement Input, Correlation [Member] | Minimum      
Assets      
Trading assets, measurement input 97   97
Recurring basis | Level 3 | Derivative instruments | Credit derivatives | Valuation Technique, Discounted Cash Flow [Member] | Measurement Input, Correlation [Member] | Maximum      
Assets      
Trading assets, measurement input 97   97
Recurring basis | Level 3 | Derivative instruments | Credit derivatives | Valuation Technique, Discounted Cash Flow [Member] | Measurement Input, Correlation [Member] | Weighted average      
Assets      
Trading assets, measurement input 97   97
Recurring basis | Level 3 | Derivative instruments | Credit derivatives | Valuation Technique, Discounted Cash Flow [Member] | Measurement Input, Default Rate [Member] | Minimum      
Assets      
Trading assets, measurement input 1   1
Recurring basis | Level 3 | Derivative instruments | Credit derivatives | Valuation Technique, Discounted Cash Flow [Member] | Measurement Input, Default Rate [Member] | Maximum      
Assets      
Trading assets, measurement input 5   20
Recurring basis | Level 3 | Derivative instruments | Credit derivatives | Valuation Technique, Discounted Cash Flow [Member] | Measurement Input, Default Rate [Member] | Weighted average      
Assets      
Trading assets, measurement input 3   4
Recurring basis | Level 3 | Derivative instruments | Credit derivatives | Valuation Technique, Discounted Cash Flow [Member] | Measurement Input, Discount Rate [Member] | Minimum      
Assets      
Trading assets, measurement input 3   8
Recurring basis | Level 3 | Derivative instruments | Credit derivatives | Valuation Technique, Discounted Cash Flow [Member] | Measurement Input, Discount Rate [Member] | Maximum      
Assets      
Trading assets, measurement input 30   27
Recurring basis | Level 3 | Derivative instruments | Credit derivatives | Valuation Technique, Discounted Cash Flow [Member] | Measurement Input, Discount Rate [Member] | Weighted average      
Assets      
Trading assets, measurement input 20   16
Recurring basis | Level 3 | Derivative instruments | Credit derivatives | Valuation Technique, Discounted Cash Flow [Member] | Measurement Input, Funding spread [Member] | Minimum      
Assets      
Trading assets, measurement input 100   100
Recurring basis | Level 3 | Derivative instruments | Credit derivatives | Valuation Technique, Discounted Cash Flow [Member] | Measurement Input, Funding spread [Member] | Maximum      
Assets      
Trading assets, measurement input 156   115
Recurring basis | Level 3 | Derivative instruments | Credit derivatives | Valuation Technique, Discounted Cash Flow [Member] | Measurement Input, Funding spread [Member] | Weighted average      
Assets      
Trading assets, measurement input 147   102
Recurring basis | Level 3 | Derivative instruments | Credit derivatives | Valuation Technique, Discounted Cash Flow [Member] | Measurement Input, Loss Severity [Member] | Minimum      
Assets      
Trading assets, measurement input 10   29
Recurring basis | Level 3 | Derivative instruments | Credit derivatives | Valuation Technique, Discounted Cash Flow [Member] | Measurement Input, Loss Severity [Member] | Maximum      
Assets      
Trading assets, measurement input 95   85
Recurring basis | Level 3 | Derivative instruments | Credit derivatives | Valuation Technique, Discounted Cash Flow [Member] | Measurement Input, Loss Severity [Member] | Weighted average      
Assets      
Trading assets, measurement input 58   69
Recurring basis | Level 3 | Derivative instruments | Credit derivatives | Valuation Technique, Discounted Cash Flow [Member] | Measurement Input, Prepayment Rate [Member] | Minimum      
Assets      
Trading assets, measurement input 2   0
Recurring basis | Level 3 | Derivative instruments | Credit derivatives | Valuation Technique, Discounted Cash Flow [Member] | Measurement Input, Prepayment Rate [Member] | Maximum      
Assets      
Trading assets, measurement input 20   7
Recurring basis | Level 3 | Derivative instruments | Credit derivatives | Valuation Technique, Discounted Cash Flow [Member] | Measurement Input, Prepayment Rate [Member] | Weighted average      
Assets      
Trading assets, measurement input 5   4
Recurring basis | Level 3 | Derivative instruments | Credit derivatives | Valuation Technique, Discounted Cash Flow [Member] | Measurement Input, Recovery rate [Member] | Minimum      
Assets      
Trading assets, measurement input 0   0
Recurring basis | Level 3 | Derivative instruments | Credit derivatives | Valuation Technique, Discounted Cash Flow [Member] | Measurement Input, Recovery rate [Member] | Maximum      
Assets      
Trading assets, measurement input 40   40
Recurring basis | Level 3 | Derivative instruments | Credit derivatives | Valuation Technique, Discounted Cash Flow [Member] | Measurement Input, Recovery rate [Member] | Weighted average      
Assets      
Trading assets, measurement input 19   26
Recurring basis | Level 3 | Derivative instruments | Credit derivatives | Market comparable      
Assets      
Trading assets SFr 95   SFr 142
Recurring basis | Level 3 | Derivative instruments | Credit derivatives | Market comparable | Measurement Input, Price Volatility [Member] | Minimum      
Assets      
Trading assets, measurement input 91   86
Recurring basis | Level 3 | Derivative instruments | Credit derivatives | Market comparable | Measurement Input, Price Volatility [Member] | Maximum      
Assets      
Trading assets, measurement input 113   110
Recurring basis | Level 3 | Derivative instruments | Credit derivatives | Market comparable | Measurement Input, Price Volatility [Member] | Weighted average      
Assets      
Trading assets, measurement input 107   98
Recurring basis | Level 3 | Derivative instruments | Other derivatives      
Assets      
Trading assets SFr 1,085   SFr 909
Recurring basis | Level 3 | Derivative instruments | Other derivatives | Valuation Technique, Discounted Cash Flow [Member] | Measurement Input, Market implied life expectancy [Member] | Minimum      
Assets      
Trading assets, measurement input 2   2
Recurring basis | Level 3 | Derivative instruments | Other derivatives | Valuation Technique, Discounted Cash Flow [Member] | Measurement Input, Market implied life expectancy [Member] | Maximum      
Assets      
Trading assets, measurement input 15   15
Recurring basis | Level 3 | Derivative instruments | Other derivatives | Valuation Technique, Discounted Cash Flow [Member] | Measurement Input, Market implied life expectancy [Member] | Weighted average      
Assets      
Trading assets, measurement input 6   6
Recurring basis | Level 3 | Derivative instruments | Other derivatives | Valuation Technique, Discounted Cash Flow [Member] | Measurement Input, Mortality Rate [Member] | Minimum      
Assets      
Trading assets, measurement input 71   71
Recurring basis | Level 3 | Derivative instruments | Other derivatives | Valuation Technique, Discounted Cash Flow [Member] | Measurement Input, Mortality Rate [Member] | Maximum      
Assets      
Trading assets, measurement input 134   134
Recurring basis | Level 3 | Derivative instruments | Other derivatives | Valuation Technique, Discounted Cash Flow [Member] | Measurement Input, Mortality Rate [Member] | Weighted average      
Assets      
Trading assets, measurement input 97   97
Recurring basis | Level 3 | Other      
Assets      
Trading assets SFr 1,356   SFr 2,231
Recurring basis | Level 3 | Other | Option model      
Assets      
Trading assets SFr 204   SFr 233
Recurring basis | Level 3 | Other | Option model | Measurement Input, Mortality Rate [Member] | Minimum      
Assets      
Trading assets, measurement input 0   0
Recurring basis | Level 3 | Other | Option model | Measurement Input, Mortality Rate [Member] | Maximum      
Assets      
Trading assets, measurement input 70   70
Recurring basis | Level 3 | Other | Option model | Measurement Input, Mortality Rate [Member] | Weighted average      
Assets      
Trading assets, measurement input 6   6
Recurring basis | Level 3 | Other | Valuation Technique, Discounted Cash Flow [Member]      
Assets      
Trading assets SFr 881   SFr 856
Recurring basis | Level 3 | Other | Valuation Technique, Discounted Cash Flow [Member] | Measurement Input, Discount Rate [Member] | Minimum      
Assets      
Other investments 9   9
Recurring basis | Level 3 | Other | Valuation Technique, Discounted Cash Flow [Member] | Measurement Input, Discount Rate [Member] | Maximum      
Assets      
Other investments 9   9
Recurring basis | Level 3 | Other | Valuation Technique, Discounted Cash Flow [Member] | Measurement Input, Discount Rate [Member] | Weighted average      
Assets      
Other investments SFr 9   SFr 9
Recurring basis | Level 3 | Other | Valuation Technique, Discounted Cash Flow [Member] | Measurement Input, Market implied life expectancy [Member] | Minimum      
Assets      
Trading assets, measurement input 3   2
Recurring basis | Level 3 | Other | Valuation Technique, Discounted Cash Flow [Member] | Measurement Input, Market implied life expectancy [Member] | Maximum      
Assets      
Trading assets, measurement input 14   15
Recurring basis | Level 3 | Other | Valuation Technique, Discounted Cash Flow [Member] | Measurement Input, Market implied life expectancy [Member] | Weighted average      
Assets      
Trading assets, measurement input 8   7
Recurring basis | Level 3 | Other | Valuation Technique, Discounted Cash Flow [Member] | Measurement Input, Terminal Growth Rate [Member] | Minimum      
Assets      
Other investments SFr 3   SFr 3
Recurring basis | Level 3 | Other | Valuation Technique, Discounted Cash Flow [Member] | Measurement Input, Terminal Growth Rate [Member] | Maximum      
Assets      
Other investments 3   3
Recurring basis | Level 3 | Other | Valuation Technique, Discounted Cash Flow [Member] | Measurement Input, Terminal Growth Rate [Member] | Weighted average      
Assets      
Other investments 3   3
Recurring basis | Level 3 | Other | Valuation Technique, Option Pricing Model [Member] | Measurement Input, Price Volatility [Member] | Minimum      
Assets      
Other investments 1   1
Recurring basis | Level 3 | Other | Valuation Technique, Option Pricing Model [Member] | Measurement Input, Price Volatility [Member] | Maximum      
Assets      
Other investments 912   869
Recurring basis | Level 3 | Other | Valuation Technique, Option Pricing Model [Member] | Measurement Input, Price Volatility [Member] | Weighted average      
Assets      
Other investments 282   231
Recurring basis | Level 3 | Other | Market comparable      
Assets      
Trading assets SFr 253   SFr 1,118
Recurring basis | Level 3 | Other | Market comparable | Measurement Input, Price Volatility [Member] | Minimum      
Assets      
Trading assets, measurement input 0   0
Other investments SFr 100   SFr 100
Recurring basis | Level 3 | Other | Market comparable | Measurement Input, Price Volatility [Member] | Maximum      
Assets      
Trading assets, measurement input 106   112
Other investments SFr 100   SFr 100
Recurring basis | Level 3 | Other | Market comparable | Measurement Input, Price Volatility [Member] | Weighted average      
Assets      
Trading assets, measurement input 24   27
Other investments SFr 100   SFr 100
Recurring basis | Level 3 | Other | Other equity investments | Valuation Technique, Discounted Cash Flow [Member]      
Assets      
Other investments 702   398
Recurring basis | Level 3 | Other | Other equity investments | Market comparable      
Assets      
Other investments SFr 146   SFr 147
Recurring basis | Level 3 | Other | Life finance instruments | Valuation Technique, Discounted Cash Flow [Member] | Measurement Input, Market implied life expectancy [Member] | Minimum      
Assets      
Loans - of which real estate, measurement input 2   2
Recurring basis | Level 3 | Other | Life finance instruments | Valuation Technique, Discounted Cash Flow [Member] | Measurement Input, Market implied life expectancy [Member] | Maximum      
Assets      
Loans - of which real estate, measurement input 16   16
Recurring basis | Level 3 | Other | Life finance instruments | Valuation Technique, Discounted Cash Flow [Member] | Measurement Input, Market implied life expectancy [Member] | Weighted average      
Assets      
Loans - of which real estate, measurement input 6   6
Bank      
Assets      
Cash and Due from Banks SFr 368   SFr 356
Central bank funds sold, securities purchased under resale agreements and securities borrowing transactions 78,448   85,556
Securities received as collateral 42,479   40,219
Trading assets 156,877   153,895
Available-for-sale Securities, Debt Securities 487   1,004
Other investments 3,731   3,548
Loans 13,231   12,661
Other intangible assets (mortgage servicing rights), at fair value 209   244
Other assets 9,321   10,402
Bank | Recurring basis      
Assets      
Cash and Due from Banks 368   356
Central bank funds sold, securities purchased under resale agreements and securities borrowing transactions 78,448   85,556
Securities received as collateral 42,479   40,219
Trading assets 156,877   153,895
Available-for-sale Securities, Debt Securities 487   1,004
Other investments 3,731   3,548
Loans 13,231   12,661
Loans - of which commercial and industrial 5,097   3,774
Loans - of which financial institutions 4,903   4,931
Loans - of which government and public institutions 2,427   3,030
Other intangible assets (mortgage servicing rights), at fair value 209   244
Other assets 9,321   10,402
Other assets - of which loans held-for-sale 6,725   8,213
Total assets at fair value 305,151   307,885
Bank | Recurring basis | Other equity investments      
Assets      
Other investments 2,301   2,081
Bank | Recurring basis | Life finance instruments      
Assets      
Other investments 1,067   1,052
Bank | Recurring basis | Debt securities      
Assets      
Trading assets 71,072   67,030
Bank | Recurring basis | Debt securities | Debt securities issued by foreign governments      
Assets      
Trading assets 27,118   26,963
Bank | Recurring basis | Debt securities | Corporate debt securities      
Assets      
Trading assets 11,224   12,085
Bank | Recurring basis | Debt securities | RMBS      
Assets      
Trading assets 29,479   23,516
Bank | Recurring basis | Equity securities      
Assets      
Trading assets 55,269   64,604
Bank | Recurring basis | Derivative instruments      
Assets      
Trading assets 25,834   17,730
Bank | Recurring basis | Other      
Assets      
Trading assets 4,702   4,531
Bank | Recurring basis | Level 3      
Assets      
Cash and Due from Banks 0   0
Central bank funds sold, securities purchased under resale agreements and securities borrowing transactions 0   0
Securities received as collateral 170   1
Trading assets 8,797   7,885
Available-for-sale Securities, Debt Securities 0   0
Other investments 2,839   2,523
Loans 3,513   3,716
Loans - of which commercial and industrial 1,473   1,283
Loans - of which financial institutions 1,100   1,201
Loans - of which government and public institutions 447   830
Other intangible assets (mortgage servicing rights), at fair value 209   244
Other assets 2,581   1,846
Other assets - of which loans held-for-sale 2,304   1,619
Total assets at fair value 18,109   16,215
Bank | Recurring basis | Level 3 | Valuation Technique, Discounted Cash Flow [Member]      
Assets      
Loans - of which commercial and industrial 912   996
Loans - of which financial institutions SFr 923   SFr 984
Loans - of which government and public institutions, measurement input 277   468
Other assets - of which loans held-for-sale SFr 323   SFr 501
Bank | Recurring basis | Level 3 | Valuation Technique, Discounted Cash Flow [Member] | Measurement Input, Credit Spread [Member] | Minimum      
Assets      
Loans - of which commercial and industrial, measurement input 99   96
Loans - of which financial institutions, measurement input 151   111
Loans - of which government and public institutions, measurement input 625   457
Other assets - of which loans held-for-sale, measurement input 117   117
Bank | Recurring basis | Level 3 | Valuation Technique, Discounted Cash Flow [Member] | Measurement Input, Credit Spread [Member] | Maximum      
Assets      
Loans - of which commercial and industrial, measurement input 2,243   1,484
Loans - of which financial institutions, measurement input 2,011   1,261
Loans - of which government and public institutions, measurement input 866   526
Other assets - of which loans held-for-sale, measurement input 651   381
Bank | Recurring basis | Level 3 | Valuation Technique, Discounted Cash Flow [Member] | Measurement Input, Credit Spread [Member] | Weighted average      
Assets      
Loans - of which commercial and industrial, measurement input 944   654
Loans - of which financial institutions, measurement input 692   412
Loans - of which government and public institutions, measurement input 712   500
Other assets - of which loans held-for-sale, measurement input 385   243
Bank | Recurring basis | Level 3 | Valuation Technique, Discounted Cash Flow [Member] | Measurement Input, Recovery rate [Member] | Minimum      
Assets      
Loans - of which commercial and industrial, measurement input 25   25
Loans - of which financial institutions, measurement input 25   25
Loans - of which government and public institutions, measurement input 25   25
Other assets - of which loans held-for-sale, measurement input 0   0
Bank | Recurring basis | Level 3 | Valuation Technique, Discounted Cash Flow [Member] | Measurement Input, Recovery rate [Member] | Maximum      
Assets      
Loans - of which commercial and industrial, measurement input 40   25
Loans - of which financial institutions, measurement input 40   25
Loans - of which government and public institutions, measurement input 25   40
Other assets - of which loans held-for-sale, measurement input 40   1
Bank | Recurring basis | Level 3 | Valuation Technique, Discounted Cash Flow [Member] | Measurement Input, Recovery rate [Member] | Weighted average      
Assets      
Loans - of which commercial and industrial, measurement input 29   25
Loans - of which financial institutions, measurement input 26   25
Loans - of which government and public institutions, measurement input 25   30
Other assets - of which loans held-for-sale, measurement input 24   1
Bank | Recurring basis | Level 3 | Market comparable      
Assets      
Loans - of which commercial and industrial SFr 437   SFr 273
Loans - of which financial institutions SFr 167   SFr 135
Loans - of which government and public institutions, measurement input 157   166
Other assets - of which loans held-for-sale SFr 1,945   SFr 1,026
Bank | Recurring basis | Level 3 | Market comparable | Measurement Input, Price Volatility [Member] | Minimum      
Assets      
Loans - of which commercial and industrial, measurement input 10   0
Loans - of which financial institutions, measurement input 12   16
Loans - of which government and public institutions, measurement input 62   62
Other assets - of which loans held-for-sale, measurement input 0   0
Bank | Recurring basis | Level 3 | Market comparable | Measurement Input, Price Volatility [Member] | Maximum      
Assets      
Loans - of which commercial and industrial, measurement input 100   99
Loans - of which financial institutions, measurement input 100   100
Loans - of which government and public institutions, measurement input 62   62
Other assets - of which loans held-for-sale, measurement input 130   180
Bank | Recurring basis | Level 3 | Market comparable | Measurement Input, Price Volatility [Member] | Weighted average      
Assets      
Loans - of which commercial and industrial, measurement input 66   64
Loans - of which financial institutions, measurement input 41   36
Loans - of which government and public institutions, measurement input 62   62
Other assets - of which loans held-for-sale, measurement input 68   91
Bank | Recurring basis | Level 3 | Other equity investments      
Assets      
Other investments SFr 1,765   SFr 1,463
Bank | Recurring basis | Level 3 | Life finance instruments      
Assets      
Other investments 1,066   1,052
Bank | Recurring basis | Level 3 | Debt securities      
Assets      
Trading assets 3,198   1,923
Bank | Recurring basis | Level 3 | Debt securities | Debt securities issued by foreign governments      
Assets      
Trading assets SFr 163   SFr 198
Bank | Recurring basis | Level 3 | Debt securities | Debt securities issued by foreign governments | Valuation Technique, Discounted Cash Flow [Member] | Measurement Input, Credit Spread [Member] | Minimum      
Assets      
Trading assets, measurement input 76   140
Bank | Recurring basis | Level 3 | Debt securities | Debt securities issued by foreign governments | Valuation Technique, Discounted Cash Flow [Member] | Measurement Input, Credit Spread [Member] | Maximum      
Assets      
Trading assets, measurement input 76   140
Bank | Recurring basis | Level 3 | Debt securities | Debt securities issued by foreign governments | Valuation Technique, Discounted Cash Flow [Member] | Measurement Input, Credit Spread [Member] | Weighted average      
Assets      
Trading assets, measurement input 76   140
Bank | Recurring basis | Level 3 | Debt securities | Corporate debt securities      
Assets      
Trading assets SFr 1,642   SFr 1,128
Bank | Recurring basis | Level 3 | Debt securities | Corporate debt securities | Option model      
Assets      
Trading assets 622   SFr 913
Bank | Recurring basis | Level 3 | Debt securities | Corporate debt securities | Valuation Technique, Discounted Cash Flow [Member]      
Assets      
Trading assets SFr 509    
Bank | Recurring basis | Level 3 | Debt securities | Corporate debt securities | Valuation Technique, Discounted Cash Flow [Member] | Measurement Input, Credit Spread [Member] | Minimum      
Assets      
Trading assets, measurement input (7)    
Bank | Recurring basis | Level 3 | Debt securities | Corporate debt securities | Valuation Technique, Discounted Cash Flow [Member] | Measurement Input, Credit Spread [Member] | Maximum      
Assets      
Trading assets, measurement input 1,558    
Bank | Recurring basis | Level 3 | Debt securities | Corporate debt securities | Valuation Technique, Discounted Cash Flow [Member] | Measurement Input, Credit Spread [Member] | Weighted average      
Assets      
Trading assets, measurement input 606    
Bank | Recurring basis | Level 3 | Debt securities | Corporate debt securities | Valuation Technique, Option Pricing Model [Member] | Measurement Input, Correlation [Member] | Minimum      
Assets      
Trading assets, measurement input (50)   (60)
Bank | Recurring basis | Level 3 | Debt securities | Corporate debt securities | Valuation Technique, Option Pricing Model [Member] | Measurement Input, Correlation [Member] | Maximum      
Assets      
Trading assets, measurement input 93   100
Bank | Recurring basis | Level 3 | Debt securities | Corporate debt securities | Valuation Technique, Option Pricing Model [Member] | Measurement Input, Correlation [Member] | Weighted average      
Assets      
Trading assets, measurement input 42   63
Bank | Recurring basis | Level 3 | Debt securities | Corporate debt securities | Valuation Technique, Option Pricing Model [Member] | Measurement Input, Gap risk [Member] | Minimum      
Assets      
Trading assets, measurement input 0   0
Bank | Recurring basis | Level 3 | Debt securities | Corporate debt securities | Valuation Technique, Option Pricing Model [Member] | Measurement Input, Gap risk [Member] | Maximum      
Assets      
Trading assets, measurement input 2   2
Bank | Recurring basis | Level 3 | Debt securities | Corporate debt securities | Valuation Technique, Option Pricing Model [Member] | Measurement Input, Gap risk [Member] | Weighted average      
Assets      
Trading assets, measurement input 0   0
Bank | Recurring basis | Level 3 | Debt securities | Corporate debt securities | Valuation Technique, Option Pricing Model [Member] | Measurement Input, Recovery rate [Member] | Minimum      
Assets      
Trading assets, measurement input 40    
Bank | Recurring basis | Level 3 | Debt securities | Corporate debt securities | Valuation Technique, Option Pricing Model [Member] | Measurement Input, Recovery rate [Member] | Maximum      
Assets      
Trading assets, measurement input 40    
Bank | Recurring basis | Level 3 | Debt securities | Corporate debt securities | Valuation Technique, Option Pricing Model [Member] | Measurement Input, Recovery rate [Member] | Weighted average      
Assets      
Trading assets, measurement input 40    
Bank | Recurring basis | Level 3 | Debt securities | Corporate debt securities | Valuation Technique, Option Pricing Model [Member] | Measurement Input, Volatility [Member] | Minimum      
Assets      
Trading assets, measurement input 0   0
Bank | Recurring basis | Level 3 | Debt securities | Corporate debt securities | Valuation Technique, Option Pricing Model [Member] | Measurement Input, Volatility [Member] | Maximum      
Assets      
Trading assets, measurement input 213   275
Bank | Recurring basis | Level 3 | Debt securities | Corporate debt securities | Valuation Technique, Option Pricing Model [Member] | Measurement Input, Volatility [Member] | Weighted average      
Assets      
Trading assets, measurement input 27   27
Bank | Recurring basis | Level 3 | Debt securities | Corporate debt securities | Vendor price      
Assets      
Trading assets SFr 54    
Bank | Recurring basis | Level 3 | Debt securities | Corporate debt securities | Vendor price | Measurement Input, Price Volatility [Member] | Minimum      
Assets      
Trading assets, measurement input 0    
Bank | Recurring basis | Level 3 | Debt securities | Corporate debt securities | Vendor price | Measurement Input, Price Volatility [Member] | Maximum      
Assets      
Trading assets, measurement input 1,373    
Bank | Recurring basis | Level 3 | Debt securities | Corporate debt securities | Vendor price | Measurement Input, Price Volatility [Member] | Weighted average      
Assets      
Trading assets, measurement input 1    
Bank | Recurring basis | Level 3 | Debt securities | Corporate debt securities | Market comparable      
Assets      
Trading assets SFr 302   SFr 503
Bank | Recurring basis | Level 3 | Debt securities | Corporate debt securities | Market comparable | Measurement Input, Price Volatility [Member] | Minimum      
Assets      
Trading assets, measurement input 0   0
Bank | Recurring basis | Level 3 | Debt securities | Corporate debt securities | Market comparable | Measurement Input, Price Volatility [Member] | Maximum      
Assets      
Trading assets, measurement input 207   129
Bank | Recurring basis | Level 3 | Debt securities | Corporate debt securities | Market comparable | Measurement Input, Price Volatility [Member] | Weighted average      
Assets      
Trading assets, measurement input 104   97
Bank | Recurring basis | Level 3 | Debt securities | RMBS      
Assets      
Trading assets SFr 1,102   SFr 317
Bank | Recurring basis | Level 3 | Debt securities | RMBS | Valuation Technique, Discounted Cash Flow [Member] | Measurement Input, Default Rate [Member] | Minimum      
Assets      
Trading assets, measurement input 0   0
Bank | Recurring basis | Level 3 | Debt securities | RMBS | Valuation Technique, Discounted Cash Flow [Member] | Measurement Input, Default Rate [Member] | Maximum      
Assets      
Trading assets, measurement input 14   12
Bank | Recurring basis | Level 3 | Debt securities | RMBS | Valuation Technique, Discounted Cash Flow [Member] | Measurement Input, Default Rate [Member] | Weighted average      
Assets      
Trading assets, measurement input 2   2
Bank | Recurring basis | Level 3 | Debt securities | RMBS | Valuation Technique, Discounted Cash Flow [Member] | Measurement Input, Discount Rate [Member] | Minimum      
Assets      
Trading assets, measurement input 1   1
Bank | Recurring basis | Level 3 | Debt securities | RMBS | Valuation Technique, Discounted Cash Flow [Member] | Measurement Input, Discount Rate [Member] | Maximum      
Assets      
Trading assets, measurement input 40   36
Bank | Recurring basis | Level 3 | Debt securities | RMBS | Valuation Technique, Discounted Cash Flow [Member] | Measurement Input, Discount Rate [Member] | Weighted average      
Assets      
Trading assets, measurement input 7   13
Bank | Recurring basis | Level 3 | Debt securities | RMBS | Valuation Technique, Discounted Cash Flow [Member] | Measurement Input, Loss Severity [Member] | Minimum      
Assets      
Trading assets, measurement input 0   0
Bank | Recurring basis | Level 3 | Debt securities | RMBS | Valuation Technique, Discounted Cash Flow [Member] | Measurement Input, Loss Severity [Member] | Maximum      
Assets      
Trading assets, measurement input 100   100
Bank | Recurring basis | Level 3 | Debt securities | RMBS | Valuation Technique, Discounted Cash Flow [Member] | Measurement Input, Loss Severity [Member] | Weighted average      
Assets      
Trading assets, measurement input 32   46
Bank | Recurring basis | Level 3 | Debt securities | RMBS | Valuation Technique, Discounted Cash Flow [Member] | Measurement Input, Prepayment Rate [Member] | Minimum      
Assets      
Trading assets, measurement input 0   2
Bank | Recurring basis | Level 3 | Debt securities | RMBS | Valuation Technique, Discounted Cash Flow [Member] | Measurement Input, Prepayment Rate [Member] | Maximum      
Assets      
Trading assets, measurement input 35   45
Bank | Recurring basis | Level 3 | Debt securities | RMBS | Valuation Technique, Discounted Cash Flow [Member] | Measurement Input, Prepayment Rate [Member] | Weighted average      
Assets      
Trading assets, measurement input 9   10
Bank | Recurring basis | Level 3 | Equity securities      
Assets      
Trading assets SFr 142   SFr 197
Bank | Recurring basis | Level 3 | Equity securities | Vendor price | Measurement Input, Price Volatility [Member] | Minimum      
Assets      
Trading assets, measurement input 0   0
Bank | Recurring basis | Level 3 | Equity securities | Vendor price | Measurement Input, Price Volatility [Member] | Maximum      
Assets      
Trading assets, measurement input 35,399   36,760
Bank | Recurring basis | Level 3 | Equity securities | Vendor price | Measurement Input, Price Volatility [Member] | Weighted average      
Assets      
Trading assets, measurement input 327   383
Bank | Recurring basis | Level 3 | Derivative instruments      
Assets      
Trading assets SFr 4,101   SFr 3,534
Bank | Recurring basis | Level 3 | Derivative instruments | Interest rate derivatives      
Assets      
Trading assets SFr 639   SFr 554
Bank | Recurring basis | Level 3 | Derivative instruments | Interest rate derivatives | Valuation Technique, Option Pricing Model [Member] | Measurement Input, Correlation [Member] | Minimum      
Assets      
Trading assets, measurement input (1)   0
Bank | Recurring basis | Level 3 | Derivative instruments | Interest rate derivatives | Valuation Technique, Option Pricing Model [Member] | Measurement Input, Correlation [Member] | Maximum      
Assets      
Trading assets, measurement input 100   100
Bank | Recurring basis | Level 3 | Derivative instruments | Interest rate derivatives | Valuation Technique, Option Pricing Model [Member] | Measurement Input, Correlation [Member] | Weighted average      
Assets      
Trading assets, measurement input 73   69
Bank | Recurring basis | Level 3 | Derivative instruments | Interest rate derivatives | Valuation Technique, Option Pricing Model [Member] | Measurement Input, Prepayment Rate [Member] | Minimum      
Assets      
Trading assets, measurement input 1   1
Bank | Recurring basis | Level 3 | Derivative instruments | Interest rate derivatives | Valuation Technique, Option Pricing Model [Member] | Measurement Input, Prepayment Rate [Member] | Maximum      
Assets      
Trading assets, measurement input 27   28
Bank | Recurring basis | Level 3 | Derivative instruments | Interest rate derivatives | Valuation Technique, Option Pricing Model [Member] | Measurement Input, Prepayment Rate [Member] | Weighted average      
Assets      
Trading assets, measurement input 9   10
Bank | Recurring basis | Level 3 | Derivative instruments | Interest rate derivatives | Valuation Technique, Option Pricing Model [Member] | Measurement Input, Volatility skew [Member] | Minimum      
Assets      
Trading assets, measurement input (3)   (4)
Bank | Recurring basis | Level 3 | Derivative instruments | Interest rate derivatives | Valuation Technique, Option Pricing Model [Member] | Measurement Input, Volatility skew [Member] | Maximum      
Assets      
Trading assets, measurement input 0   6
Bank | Recurring basis | Level 3 | Derivative instruments | Interest rate derivatives | Valuation Technique, Option Pricing Model [Member] | Measurement Input, Volatility skew [Member] | Weighted average      
Assets      
Trading assets, measurement input (2)   (1)
Bank | Recurring basis | Level 3 | Derivative instruments | Interest rate derivatives | Valuation Technique, Option Pricing Model [Member] | Measurement Input, Volatility [Member] | Minimum      
Assets      
Trading assets, measurement input (30)    
Bank | Recurring basis | Level 3 | Derivative instruments | Interest rate derivatives | Valuation Technique, Option Pricing Model [Member] | Measurement Input, Volatility [Member] | Maximum      
Assets      
Trading assets, measurement input 25    
Bank | Recurring basis | Level 3 | Derivative instruments | Interest rate derivatives | Valuation Technique, Option Pricing Model [Member] | Measurement Input, Volatility [Member] | Weighted average      
Assets      
Trading assets, measurement input (2)    
Bank | Recurring basis | Level 3 | Derivative instruments | Interest rate derivatives | Vendor price      
Assets      
Other investments SFr 857   SFr 857
Bank | Recurring basis | Level 3 | Derivative instruments | Foreign exchange derivatives      
Assets      
Trading assets SFr 138   SFr 152
Bank | Recurring basis | Level 3 | Derivative instruments | Foreign exchange derivatives | Valuation Technique, Option Pricing Model [Member] | Measurement Input, Correlation [Member] | Minimum      
Assets      
Trading assets, measurement input 5   5
Bank | Recurring basis | Level 3 | Derivative instruments | Foreign exchange derivatives | Valuation Technique, Option Pricing Model [Member] | Measurement Input, Correlation [Member] | Maximum      
Assets      
Trading assets, measurement input 70   70
Bank | Recurring basis | Level 3 | Derivative instruments | Foreign exchange derivatives | Valuation Technique, Option Pricing Model [Member] | Measurement Input, Correlation [Member] | Weighted average      
Assets      
Trading assets, measurement input 29   30
Bank | Recurring basis | Level 3 | Derivative instruments | Foreign exchange derivatives | Valuation Technique, Option Pricing Model [Member] | Measurement Input, Prepayment Rate [Member] | Minimum      
Assets      
Trading assets, measurement input 23   23
Bank | Recurring basis | Level 3 | Derivative instruments | Foreign exchange derivatives | Valuation Technique, Option Pricing Model [Member] | Measurement Input, Prepayment Rate [Member] | Maximum      
Assets      
Trading assets, measurement input 27   28
Bank | Recurring basis | Level 3 | Derivative instruments | Foreign exchange derivatives | Valuation Technique, Option Pricing Model [Member] | Measurement Input, Prepayment Rate [Member] | Weighted average      
Assets      
Trading assets, measurement input 25   25
Bank | Recurring basis | Level 3 | Derivative instruments | Equity/Index-related products      
Assets      
Trading assets SFr 1,067   SFr 1,040
Bank | Recurring basis | Level 3 | Derivative instruments | Equity/Index-related products | Option model | Measurement Input, Buyback probability [Member] | Minimum      
Assets      
Trading assets, measurement input 50   50
Bank | Recurring basis | Level 3 | Derivative instruments | Equity/Index-related products | Option model | Measurement Input, Buyback probability [Member] | Maximum      
Assets      
Trading assets, measurement input 100   100
Bank | Recurring basis | Level 3 | Derivative instruments | Equity/Index-related products | Option model | Measurement Input, Buyback probability [Member] | Weighted average      
Assets      
Trading assets, measurement input 70   70
Bank | Recurring basis | Level 3 | Derivative instruments | Equity/Index-related products | Option model | Measurement Input, Correlation [Member] | Minimum      
Assets      
Trading assets, measurement input (50)   (50)
Bank | Recurring basis | Level 3 | Derivative instruments | Equity/Index-related products | Option model | Measurement Input, Correlation [Member] | Maximum      
Assets      
Trading assets, measurement input 93   100
Bank | Recurring basis | Level 3 | Derivative instruments | Equity/Index-related products | Option model | Measurement Input, Correlation [Member] | Weighted average      
Assets      
Trading assets, measurement input 55   64
Bank | Recurring basis | Level 3 | Derivative instruments | Equity/Index-related products | Option model | Measurement Input, Gap risk [Member] | Minimum      
Assets      
Trading assets, measurement input 0   0
Bank | Recurring basis | Level 3 | Derivative instruments | Equity/Index-related products | Option model | Measurement Input, Gap risk [Member] | Maximum      
Assets      
Trading assets, measurement input 2   2
Bank | Recurring basis | Level 3 | Derivative instruments | Equity/Index-related products | Option model | Measurement Input, Gap risk [Member] | Weighted average      
Assets      
Trading assets, measurement input 0   0
Bank | Recurring basis | Level 3 | Derivative instruments | Equity/Index-related products | Option model | Measurement Input, Volatility [Member] | Minimum      
Assets      
Trading assets, measurement input (85)   0
Bank | Recurring basis | Level 3 | Derivative instruments | Equity/Index-related products | Option model | Measurement Input, Volatility [Member] | Maximum      
Assets      
Trading assets, measurement input 213   275
Bank | Recurring basis | Level 3 | Derivative instruments | Equity/Index-related products | Option model | Measurement Input, Volatility [Member] | Weighted average      
Assets      
Trading assets, measurement input 16   30
Bank | Recurring basis | Level 3 | Derivative instruments | Credit derivatives      
Assets      
Trading assets SFr 1,172   SFr 879
Bank | Recurring basis | Level 3 | Derivative instruments | Credit derivatives | Valuation Technique, Discounted Cash Flow [Member]      
Assets      
Trading assets SFr 1,026    
Bank | Recurring basis | Level 3 | Derivative instruments | Credit derivatives | Valuation Technique, Discounted Cash Flow [Member] | Measurement Input, Credit Spread [Member] | Minimum      
Assets      
Trading assets, measurement input 0   2
Bank | Recurring basis | Level 3 | Derivative instruments | Credit derivatives | Valuation Technique, Discounted Cash Flow [Member] | Measurement Input, Credit Spread [Member] | Maximum      
Assets      
Trading assets, measurement input 3,286   1,033
Bank | Recurring basis | Level 3 | Derivative instruments | Credit derivatives | Valuation Technique, Discounted Cash Flow [Member] | Measurement Input, Credit Spread [Member] | Weighted average      
Assets      
Trading assets, measurement input 994   150
Bank | Recurring basis | Level 3 | Derivative instruments | Credit derivatives | Valuation Technique, Discounted Cash Flow [Member] | Measurement Input, Credit curve volatility [Member] | Minimum      
Assets      
Trading assets, measurement input 60    
Bank | Recurring basis | Level 3 | Derivative instruments | Credit derivatives | Valuation Technique, Discounted Cash Flow [Member] | Measurement Input, Credit curve volatility [Member] | Maximum      
Assets      
Trading assets, measurement input 103    
Bank | Recurring basis | Level 3 | Derivative instruments | Credit derivatives | Valuation Technique, Discounted Cash Flow [Member] | Measurement Input, Credit curve volatility [Member] | Weighted average      
Assets      
Trading assets, measurement input 89    
Bank | Recurring basis | Level 3 | Derivative instruments | Credit derivatives | Valuation Technique, Discounted Cash Flow [Member] | Measurement Input, Correlation [Member] | Minimum      
Assets      
Trading assets, measurement input 97   97
Bank | Recurring basis | Level 3 | Derivative instruments | Credit derivatives | Valuation Technique, Discounted Cash Flow [Member] | Measurement Input, Correlation [Member] | Maximum      
Assets      
Trading assets, measurement input 97   97
Bank | Recurring basis | Level 3 | Derivative instruments | Credit derivatives | Valuation Technique, Discounted Cash Flow [Member] | Measurement Input, Correlation [Member] | Weighted average      
Assets      
Trading assets, measurement input 97   97
Bank | Recurring basis | Level 3 | Derivative instruments | Credit derivatives | Valuation Technique, Discounted Cash Flow [Member] | Measurement Input, Default Rate [Member] | Minimum      
Assets      
Trading assets, measurement input 1   1
Bank | Recurring basis | Level 3 | Derivative instruments | Credit derivatives | Valuation Technique, Discounted Cash Flow [Member] | Measurement Input, Default Rate [Member] | Maximum      
Assets      
Trading assets, measurement input 5   20
Bank | Recurring basis | Level 3 | Derivative instruments | Credit derivatives | Valuation Technique, Discounted Cash Flow [Member] | Measurement Input, Default Rate [Member] | Weighted average      
Assets      
Trading assets, measurement input 3   4
Bank | Recurring basis | Level 3 | Derivative instruments | Credit derivatives | Valuation Technique, Discounted Cash Flow [Member] | Measurement Input, Discount Rate [Member] | Minimum      
Assets      
Trading assets, measurement input 3   8
Bank | Recurring basis | Level 3 | Derivative instruments | Credit derivatives | Valuation Technique, Discounted Cash Flow [Member] | Measurement Input, Discount Rate [Member] | Maximum      
Assets      
Trading assets, measurement input 30   27
Bank | Recurring basis | Level 3 | Derivative instruments | Credit derivatives | Valuation Technique, Discounted Cash Flow [Member] | Measurement Input, Discount Rate [Member] | Weighted average      
Assets      
Trading assets, measurement input 20   16
Bank | Recurring basis | Level 3 | Derivative instruments | Credit derivatives | Valuation Technique, Discounted Cash Flow [Member] | Measurement Input, Funding spread [Member] | Minimum      
Assets      
Trading assets, measurement input 100   100
Bank | Recurring basis | Level 3 | Derivative instruments | Credit derivatives | Valuation Technique, Discounted Cash Flow [Member] | Measurement Input, Funding spread [Member] | Maximum      
Assets      
Trading assets, measurement input 156   115
Bank | Recurring basis | Level 3 | Derivative instruments | Credit derivatives | Valuation Technique, Discounted Cash Flow [Member] | Measurement Input, Funding spread [Member] | Weighted average      
Assets      
Trading assets, measurement input 147   102
Bank | Recurring basis | Level 3 | Derivative instruments | Credit derivatives | Valuation Technique, Discounted Cash Flow [Member] | Measurement Input, Loss Severity [Member] | Minimum      
Assets      
Trading assets, measurement input 10   29
Bank | Recurring basis | Level 3 | Derivative instruments | Credit derivatives | Valuation Technique, Discounted Cash Flow [Member] | Measurement Input, Loss Severity [Member] | Maximum      
Assets      
Trading assets, measurement input 95   85
Bank | Recurring basis | Level 3 | Derivative instruments | Credit derivatives | Valuation Technique, Discounted Cash Flow [Member] | Measurement Input, Loss Severity [Member] | Weighted average      
Assets      
Trading assets, measurement input 58   69
Bank | Recurring basis | Level 3 | Derivative instruments | Credit derivatives | Valuation Technique, Discounted Cash Flow [Member] | Measurement Input, Prepayment Rate [Member] | Minimum      
Assets      
Trading assets, measurement input 2   0
Bank | Recurring basis | Level 3 | Derivative instruments | Credit derivatives | Valuation Technique, Discounted Cash Flow [Member] | Measurement Input, Prepayment Rate [Member] | Maximum      
Assets      
Trading assets, measurement input 20   7
Bank | Recurring basis | Level 3 | Derivative instruments | Credit derivatives | Valuation Technique, Discounted Cash Flow [Member] | Measurement Input, Prepayment Rate [Member] | Weighted average      
Assets      
Trading assets, measurement input 5   4
Bank | Recurring basis | Level 3 | Derivative instruments | Credit derivatives | Valuation Technique, Discounted Cash Flow [Member] | Measurement Input, Recovery rate [Member] | Minimum      
Assets      
Trading assets, measurement input 0   0
Bank | Recurring basis | Level 3 | Derivative instruments | Credit derivatives | Valuation Technique, Discounted Cash Flow [Member] | Measurement Input, Recovery rate [Member] | Maximum      
Assets      
Trading assets, measurement input 40   40
Bank | Recurring basis | Level 3 | Derivative instruments | Credit derivatives | Valuation Technique, Discounted Cash Flow [Member] | Measurement Input, Recovery rate [Member] | Weighted average      
Assets      
Trading assets, measurement input 19   26
Bank | Recurring basis | Level 3 | Derivative instruments | Credit derivatives | Market comparable      
Assets      
Trading assets SFr 95   SFr 142
Bank | Recurring basis | Level 3 | Derivative instruments | Credit derivatives | Market comparable | Measurement Input, Price Volatility [Member] | Minimum      
Assets      
Trading assets, measurement input 91   86
Bank | Recurring basis | Level 3 | Derivative instruments | Credit derivatives | Market comparable | Measurement Input, Price Volatility [Member] | Maximum      
Assets      
Trading assets, measurement input 113   110
Bank | Recurring basis | Level 3 | Derivative instruments | Credit derivatives | Market comparable | Measurement Input, Price Volatility [Member] | Weighted average      
Assets      
Trading assets, measurement input 107   98
Bank | Recurring basis | Level 3 | Derivative instruments | Other derivatives      
Assets      
Trading assets SFr 1,085   SFr 909
Bank | Recurring basis | Level 3 | Derivative instruments | Other derivatives | Valuation Technique, Discounted Cash Flow [Member] | Measurement Input, Market implied life expectancy [Member] | Minimum      
Assets      
Trading assets, measurement input 2   2
Bank | Recurring basis | Level 3 | Derivative instruments | Other derivatives | Valuation Technique, Discounted Cash Flow [Member] | Measurement Input, Market implied life expectancy [Member] | Maximum      
Assets      
Trading assets, measurement input 15   15
Bank | Recurring basis | Level 3 | Derivative instruments | Other derivatives | Valuation Technique, Discounted Cash Flow [Member] | Measurement Input, Market implied life expectancy [Member] | Weighted average      
Assets      
Trading assets, measurement input 6   6
Bank | Recurring basis | Level 3 | Derivative instruments | Other derivatives | Valuation Technique, Discounted Cash Flow [Member] | Measurement Input, Mortality Rate [Member] | Minimum      
Assets      
Trading assets, measurement input 71   71
Bank | Recurring basis | Level 3 | Derivative instruments | Other derivatives | Valuation Technique, Discounted Cash Flow [Member] | Measurement Input, Mortality Rate [Member] | Maximum      
Assets      
Trading assets, measurement input 134   134
Bank | Recurring basis | Level 3 | Derivative instruments | Other derivatives | Valuation Technique, Discounted Cash Flow [Member] | Measurement Input, Mortality Rate [Member] | Weighted average      
Assets      
Trading assets, measurement input 97   97
Bank | Recurring basis | Level 3 | Other      
Assets      
Trading assets SFr 1,356   SFr 2,231
Bank | Recurring basis | Level 3 | Other | Option model      
Assets      
Trading assets SFr 204   SFr 233
Bank | Recurring basis | Level 3 | Other | Option model | Measurement Input, Mortality Rate [Member] | Minimum      
Assets      
Trading assets, measurement input 0   0
Bank | Recurring basis | Level 3 | Other | Option model | Measurement Input, Mortality Rate [Member] | Maximum      
Assets      
Trading assets, measurement input 70   70
Bank | Recurring basis | Level 3 | Other | Option model | Measurement Input, Mortality Rate [Member] | Weighted average      
Assets      
Trading assets, measurement input 6   6
Bank | Recurring basis | Level 3 | Other | Valuation Technique, Discounted Cash Flow [Member]      
Assets      
Trading assets SFr 881   SFr 856
Bank | Recurring basis | Level 3 | Other | Valuation Technique, Discounted Cash Flow [Member] | Measurement Input, Discount Rate [Member] | Minimum      
Assets      
Other investments 9   9
Bank | Recurring basis | Level 3 | Other | Valuation Technique, Discounted Cash Flow [Member] | Measurement Input, Discount Rate [Member] | Maximum      
Assets      
Other investments 9   9
Bank | Recurring basis | Level 3 | Other | Valuation Technique, Discounted Cash Flow [Member] | Measurement Input, Discount Rate [Member] | Weighted average      
Assets      
Other investments SFr 9   SFr 9
Bank | Recurring basis | Level 3 | Other | Valuation Technique, Discounted Cash Flow [Member] | Measurement Input, Market implied life expectancy [Member] | Minimum      
Assets      
Trading assets, measurement input 3   2
Bank | Recurring basis | Level 3 | Other | Valuation Technique, Discounted Cash Flow [Member] | Measurement Input, Market implied life expectancy [Member] | Maximum      
Assets      
Trading assets, measurement input 14   15
Bank | Recurring basis | Level 3 | Other | Valuation Technique, Discounted Cash Flow [Member] | Measurement Input, Market implied life expectancy [Member] | Weighted average      
Assets      
Trading assets, measurement input 8   7
Bank | Recurring basis | Level 3 | Other | Valuation Technique, Discounted Cash Flow [Member] | Measurement Input, Terminal Growth Rate [Member] | Minimum      
Assets      
Other investments SFr 3   SFr 3
Bank | Recurring basis | Level 3 | Other | Valuation Technique, Discounted Cash Flow [Member] | Measurement Input, Terminal Growth Rate [Member] | Maximum      
Assets      
Other investments 3   3
Bank | Recurring basis | Level 3 | Other | Valuation Technique, Discounted Cash Flow [Member] | Measurement Input, Terminal Growth Rate [Member] | Weighted average      
Assets      
Other investments 3   3
Bank | Recurring basis | Level 3 | Other | Valuation Technique, Option Pricing Model [Member] | Measurement Input, Price Volatility [Member] | Minimum      
Assets      
Other investments 1   1
Bank | Recurring basis | Level 3 | Other | Valuation Technique, Option Pricing Model [Member] | Measurement Input, Price Volatility [Member] | Maximum      
Assets      
Other investments 912   869
Bank | Recurring basis | Level 3 | Other | Valuation Technique, Option Pricing Model [Member] | Measurement Input, Price Volatility [Member] | Weighted average      
Assets      
Other investments 282   231
Bank | Recurring basis | Level 3 | Other | Market comparable      
Assets      
Trading assets SFr 253   SFr 1,118
Bank | Recurring basis | Level 3 | Other | Market comparable | Measurement Input, Price Volatility [Member] | Minimum      
Assets      
Trading assets, measurement input 0   0
Other investments SFr 100   SFr 100
Bank | Recurring basis | Level 3 | Other | Market comparable | Measurement Input, Price Volatility [Member] | Maximum      
Assets      
Trading assets, measurement input 106   112
Other investments SFr 100   SFr 100
Bank | Recurring basis | Level 3 | Other | Market comparable | Measurement Input, Price Volatility [Member] | Weighted average      
Assets      
Trading assets, measurement input 24   27
Other investments SFr 100   SFr 100
Bank | Recurring basis | Level 3 | Other | Other equity investments | Valuation Technique, Discounted Cash Flow [Member]      
Assets      
Other investments 702   398
Bank | Recurring basis | Level 3 | Other | Other equity investments | Market comparable | Measurement Input, Market implied life expectancy [Member]      
Assets      
Other investments SFr 146   SFr 147
Bank | Recurring basis | Level 3 | Other | Life finance instruments | Valuation Technique, Discounted Cash Flow [Member] | Measurement Input, Market implied life expectancy [Member] | Minimum      
Assets      
Loans - of which real estate, measurement input 2   2
Bank | Recurring basis | Level 3 | Other | Life finance instruments | Valuation Technique, Discounted Cash Flow [Member] | Measurement Input, Market implied life expectancy [Member] | Maximum      
Assets      
Loans - of which real estate, measurement input 16   16
Bank | Recurring basis | Level 3 | Other | Life finance instruments | Valuation Technique, Discounted Cash Flow [Member] | Measurement Input, Market implied life expectancy [Member] | Weighted average      
Assets      
Loans - of which real estate, measurement input 6   6
Bank | Nonrecurring basis | Level 3 | Derivative instruments | Credit derivatives | Valuation Technique, Discounted Cash Flow [Member]      
Assets      
Trading assets     SFr 691