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Financial instruments (Details 3) (CHF)
In Millions, unless otherwise specified
Dec. 31, 2011
Dec. 31, 2010
Liabilities (CHF million)    
Due to banks 2,721 3,444
Customer deposits 4,599 3,537
Central bank funds purchased, securities sold under repurchase agreements and securities lending transactions 136,483 123,697
Obligation to return securities received as collateral 30,191 42,147
Trading liabilities 127,760 133,997
Short-term borrowings 3,547 3,308
Long-term debt 70,366 83,692
Other liabilities 31,092 29,185
Level 1 | Recurring basis
    
Liabilities (CHF million)    
Due to banks 0 0
Customer deposits 0 0
Central bank funds purchased, securities sold under repurchase agreements and securities lending transactions 0 0
Obligation to return securities received as collateral 26,052 36,319
Trading liabilities 64,088 71,032
Short-term borrowings 0 0
Long-term debt 122 402
Other liabilities 0 0
Total liabilities 90,262 107,753
Level 1 | Recurring basis | Long-term debt - of which treasury debt over two years
    
Liabilities (CHF million)    
Long-term debt 0 0
Level 1 | Recurring basis | Long-term debt - of which structured notes over two years
    
Liabilities (CHF million)    
Long-term debt 0 0
Level 1 | Recurring basis | Long-term debt - of which nonrecourse liabilities
    
Liabilities (CHF million)    
Long-term debt 122 402
Level 1 | Recurring basis | Other liabilities - of which failed sales
    
Liabilities (CHF million)    
Other liabilities 0 0
Level 1 | Recurring basis | Debt securities
    
Liabilities (CHF million)    
Obligation to return securities received as collateral 94 431
Trading liabilities 38,681 44,635
Level 1 | Recurring basis | Debt securities | Debt securities issued by foreign governments
    
Liabilities (CHF million)    
Trading liabilities 38,622 44,466
Level 1 | Recurring basis | Debt securities | Corporate debt securities
    
Liabilities (CHF million)    
Obligation to return securities received as collateral 0 0
Trading liabilities 6 6
Level 1 | Recurring basis | Equity securities
    
Liabilities (CHF million)    
Obligation to return securities received as collateral 25,958 35,888
Trading liabilities 19,124 19,580
Level 1 | Recurring basis | Derivative instruments
    
Liabilities (CHF million)    
Trading liabilities 6,283 6,817
Level 1 | Recurring basis | Derivative instruments | Interest rate derivatives
    
Liabilities (CHF million)    
Trading liabilities 1,941 2,980
Level 1 | Recurring basis | Derivative instruments | Foreign exchange derivatives
    
Liabilities (CHF million)    
Trading liabilities 1 16
Level 1 | Recurring basis | Derivative instruments | Equity/index-related derivatives
    
Liabilities (CHF million)    
Trading liabilities 3,809 2,971
Level 1 | Recurring basis | Derivative instruments | Credit derivatives
    
Liabilities (CHF million)    
Trading liabilities 0 0
Level 2 | Recurring basis
    
Liabilities (CHF million)    
Due to banks 2,721 3,444
Customer deposits 4,599 3,537
Central bank funds purchased, securities sold under repurchase agreements and securities lending transactions 136,483 123,190
Obligation to return securities received as collateral 3,946 5,828
Trading liabilities 930,013 685,197
Short-term borrowings 3,311 3,185
Long-term debt 57,529 66,493
Other liabilities 27,536 26,047
Total liabilities 1,166,138 916,921
Level 2 | Recurring basis | Long-term debt - of which treasury debt over two years
    
Liabilities (CHF million)    
Long-term debt 14,228 19,500
Level 2 | Recurring basis | Long-term debt - of which structured notes over two years
    
Liabilities (CHF million)    
Long-term debt 19,692 20,162
Level 2 | Recurring basis | Long-term debt - of which nonrecourse liabilities
    
Liabilities (CHF million)    
Long-term debt 10,564 12,200
Level 2 | Recurring basis | Other liabilities - of which failed sales
    
Liabilities (CHF million)    
Other liabilities 3,821 3,885
Level 2 | Recurring basis | Debt securities
    
Liabilities (CHF million)    
Obligation to return securities received as collateral 3,895 5,812
Trading liabilities 9,301 11,356
Level 2 | Recurring basis | Debt securities | Debt securities issued by foreign governments
    
Liabilities (CHF million)    
Trading liabilities 829 1,130
Level 2 | Recurring basis | Debt securities | Corporate debt securities
    
Liabilities (CHF million)    
Obligation to return securities received as collateral 3,835 5,552
Trading liabilities 7,591 9,432
Level 2 | Recurring basis | Equity securities
    
Liabilities (CHF million)    
Obligation to return securities received as collateral 51 16
Trading liabilities 461 404
Level 2 | Recurring basis | Derivative instruments
    
Liabilities (CHF million)    
Trading liabilities 920,251 673,437
Level 2 | Recurring basis | Derivative instruments | Interest rate derivatives
    
Liabilities (CHF million)    
Trading liabilities 717,248 470,284
Level 2 | Recurring basis | Derivative instruments | Foreign exchange derivatives
    
Liabilities (CHF million)    
Trading liabilities 91,846 95,916
Level 2 | Recurring basis | Derivative instruments | Equity/index-related derivatives
    
Liabilities (CHF million)    
Trading liabilities 37,018 35,897
Level 2 | Recurring basis | Derivative instruments | Credit derivatives
    
Liabilities (CHF million)    
Trading liabilities 58,497 45,343
Level 3 | Recurring basis
    
Liabilities (CHF million)    
Due to banks 0 0
Customer deposits 0 0
Central bank funds purchased, securities sold under repurchase agreements and securities lending transactions 0 507
Obligation to return securities received as collateral 193 0
Trading liabilities 7,343 9,200
Short-term borrowings 236 123
Long-term debt 12,715 16,797
Other liabilities 3,891 3,734
Total liabilities 24,378 30,361
Level 3 | Recurring basis | Long-term debt - of which treasury debt over two years
    
Liabilities (CHF million)    
Long-term debt 0 0
Level 3 | Recurring basis | Long-term debt - of which structured notes over two years
    
Liabilities (CHF million)    
Long-term debt 7,576 9,488
Level 3 | Recurring basis | Long-term debt - of which nonrecourse liabilities
    
Liabilities (CHF million)    
Long-term debt 3,585 6,825
Level 3 | Recurring basis | Other liabilities - of which failed sales
    
Liabilities (CHF million)    
Other liabilities 1,909 1,849
Level 3 | Recurring basis | Debt securities
    
Liabilities (CHF million)    
Obligation to return securities received as collateral 112 0
Trading liabilities 21 65
Level 3 | Recurring basis | Debt securities | Debt securities issued by foreign governments
    
Liabilities (CHF million)    
Trading liabilities 0 0
Level 3 | Recurring basis | Debt securities | Corporate debt securities
    
Liabilities (CHF million)    
Obligation to return securities received as collateral 112 0
Trading liabilities 13 65
Level 3 | Recurring basis | Equity securities
    
Liabilities (CHF million)    
Obligation to return securities received as collateral 81 0
Trading liabilities 7 28
Level 3 | Recurring basis | Derivative instruments
    
Liabilities (CHF million)    
Trading liabilities 7,315 9,107
Level 3 | Recurring basis | Derivative instruments | Interest rate derivatives
    
Liabilities (CHF million)    
Trading liabilities 1,588 1,341
Level 3 | Recurring basis | Derivative instruments | Foreign exchange derivatives
    
Liabilities (CHF million)    
Trading liabilities 2,836 2,941
Level 3 | Recurring basis | Derivative instruments | Equity/index-related derivatives
    
Liabilities (CHF million)    
Trading liabilities 1,022 2,940
Level 3 | Recurring basis | Derivative instruments | Credit derivatives
    
Liabilities (CHF million)    
Trading liabilities 1,520 1,256
Netting impact | Recurring basis
    
Liabilities (CHF million)    
Due to banks 0 0
Customer deposits 0 0
Central bank funds purchased, securities sold under repurchase agreements and securities lending transactions 0 0
Obligation to return securities received as collateral 0 0
Trading liabilities (873,684) (631,432)
Short-term borrowings 0 0
Long-term debt 0 0
Other liabilities (335) (596)
Total liabilities (874,019) (632,028)
Netting impact | Recurring basis | Long-term debt - of which treasury debt over two years
    
Liabilities (CHF million)    
Long-term debt 0 0
Netting impact | Recurring basis | Long-term debt - of which structured notes over two years
    
Liabilities (CHF million)    
Long-term debt 0 0
Netting impact | Recurring basis | Long-term debt - of which nonrecourse liabilities
    
Liabilities (CHF million)    
Long-term debt 0 0
Netting impact | Recurring basis | Other liabilities - of which failed sales
    
Liabilities (CHF million)    
Other liabilities 0 0
Netting impact | Recurring basis | Debt securities
    
Liabilities (CHF million)    
Obligation to return securities received as collateral 0 0
Trading liabilities 0 0
Netting impact | Recurring basis | Debt securities | Debt securities issued by foreign governments
    
Liabilities (CHF million)    
Trading liabilities 0 0
Netting impact | Recurring basis | Debt securities | Corporate debt securities
    
Liabilities (CHF million)    
Obligation to return securities received as collateral 0 0
Trading liabilities 0 0
Netting impact | Recurring basis | Equity securities
    
Liabilities (CHF million)    
Obligation to return securities received as collateral 0 0
Trading liabilities 0 0
Netting impact | Recurring basis | Derivative instruments
    
Liabilities (CHF million)    
Trading liabilities (873,684) (631,432)
Total - at fair value | Recurring basis
    
Liabilities (CHF million)    
Due to banks 2,721 3,444
Customer deposits 4,599 3,537
Central bank funds purchased, securities sold under repurchase agreements and securities lending transactions 136,483 123,697
Obligation to return securities received as collateral 30,191 42,147
Trading liabilities 127,760 133,997
Short-term borrowings 3,547 3,308
Long-term debt 70,366 83,692
Other liabilities 31,092 29,185
Total liabilities 406,759 423,007
Total - at fair value | Recurring basis | Long-term debt - of which treasury debt over two years
    
Liabilities (CHF million)    
Long-term debt 14,288 19,500
Total - at fair value | Recurring basis | Long-term debt - of which structured notes over two years
    
Liabilities (CHF million)    
Long-term debt 27,268 29,650
Total - at fair value | Recurring basis | Long-term debt - of which nonrecourse liabilities
    
Liabilities (CHF million)    
Long-term debt 14,271 19,427
Total - at fair value | Recurring basis | Other liabilities - of which failed sales
    
Liabilities (CHF million)    
Other liabilities 5,730 5,734
Total - at fair value | Recurring basis | Debt securities
    
Liabilities (CHF million)    
Obligation to return securities received as collateral 4,101 6,243
Trading liabilities 48,003 56,056
Total - at fair value | Recurring basis | Debt securities | Debt securities issued by foreign governments
    
Liabilities (CHF million)    
Trading liabilities 39,451 45,596
Total - at fair value | Recurring basis | Debt securities | Corporate debt securities
    
Liabilities (CHF million)    
Obligation to return securities received as collateral 3,947 5,552
Trading liabilities 7,610 9,503
Total - at fair value | Recurring basis | Equity securities
    
Liabilities (CHF million)    
Obligation to return securities received as collateral 26,090 35,904
Trading liabilities 19,592 20,012
Total - at fair value | Recurring basis | Derivative instruments
    
Liabilities (CHF million)    
Trading liabilities 60,165 57,929