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Financial instruments (Details 11) (CHF)
In Millions, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Schedule of Investments, Fair Value Calculated Using Net Asset Value    
Non-redeemable 4,043 4,597
Redeemable 3,458 4,297
Total fair value 7,501 8,894
Unfunded commitments 863 1,273
Investments, Fair Value Calculated Using Net Asset Value, Additional Disclosures    
Nonredeemable attributable to non-controlling interest 1,819 1,958
Redeemable attributable to non-controlling interest 107 107
Unfunded commitments attributable to non-controlling interest 405 418
High end of period of time, in years, that the underlying assets of non-redeemable funds are expected to be liquidated 10  
Funds held in trading assets and liabilities
    
Schedule of Investments, Fair Value Calculated Using Net Asset Value    
Non-redeemable 29 179
Redeemable 3,097 3,737
Total fair value 3,126 3,916
Unfunded commitments 0 0
Funds held in trading assets and liabilities | Debt funds
    
Schedule of Investments, Fair Value Calculated Using Net Asset Value    
Non-redeemable 1 127
Redeemable 18 38
Total fair value 19 165
Unfunded commitments 0 0
Funds held in trading assets and liabilities | Equity funds
    
Schedule of Investments, Fair Value Calculated Using Net Asset Value    
Non-redeemable 28 52
Redeemable 3,096 3,810
Total fair value 3,124 3,862
Unfunded commitments 0 0
Investments, Fair Value Calculated Using Net Asset Value, Additional Disclosures    
Percentage of investment subject to on demand redemption 55.00% 57.00%
Percentage of investment subject to monthly redemption 17.00% 13.00%
Percentage of investment subject to quarterly redemption 9.00% 13.00%
Percentage of investment subject to annual redemption 19.00% 17.00%
Funds held in trading assets and liabilities | Equity funds sold short
    
Schedule of Investments, Fair Value Calculated Using Net Asset Value    
Non-redeemable 0 0
Redeemable (17) (111)
Total fair value (17) (111)
Unfunded commitments 0 0
Funds held in other investments
    
Schedule of Investments, Fair Value Calculated Using Net Asset Value    
Non-redeemable 4,014 4,418
Redeemable 361 560
Total fair value 4,375 4,978
Unfunded commitments 863 1,273
Funds held in other investments | Hedge funds
    
Schedule of Investments, Fair Value Calculated Using Net Asset Value    
Non-redeemable 320 75
Redeemable 361 560
Total fair value 681 635
Unfunded commitments 37 203
Investments, Fair Value Calculated Using Net Asset Value, Additional Disclosures    
Percentage of investment subject to on demand redemption 33.00% 19.00%
Percentage of investment subject to quarterly redemption 45.00% 66.00%
Percentage of investment subject to annual redemption 21.00% 11.00%
Funds held in other investments | Private equity funds
    
Schedule of Investments, Fair Value Calculated Using Net Asset Value    
Non-redeemable 3,345 3,958
Redeemable 0 0
Total fair value 3,345 3,958
Unfunded commitments 826 1,070
Funds held in other investments | Equity method investments
    
Schedule of Investments, Fair Value Calculated Using Net Asset Value    
Non-redeemable 349 385
Redeemable 0 0
Total fair value 349 385
Unfunded commitments 0 0
Funds held in other investments | Debt funds | Hedge funds
    
Schedule of Investments, Fair Value Calculated Using Net Asset Value    
Non-redeemable 320 69
Redeemable 183 364
Total fair value 503 433
Unfunded commitments 6 157
Funds held in other investments | Debt funds | Private equity funds
    
Schedule of Investments, Fair Value Calculated Using Net Asset Value    
Non-redeemable 53 97
Redeemable 0 0
Total fair value 53 97
Unfunded commitments 2 17
Funds held in other investments | Equity funds | Hedge funds
    
Schedule of Investments, Fair Value Calculated Using Net Asset Value    
Non-redeemable 0 3
Redeemable 25 43
Total fair value 25 46
Unfunded commitments 0 0
Funds held in other investments | Equity funds | Private equity funds
    
Schedule of Investments, Fair Value Calculated Using Net Asset Value    
Non-redeemable 2,236 2,633
Redeemable 0 0
Total fair value 2,236 2,633
Unfunded commitments 464 724
Funds held in other investments | Real estate funds | Private equity funds
    
Schedule of Investments, Fair Value Calculated Using Net Asset Value    
Non-redeemable 350 382
Redeemable 0 0
Total fair value 350 382
Unfunded commitments 110 131
Funds held in other investments | Others | Hedge funds
    
Schedule of Investments, Fair Value Calculated Using Net Asset Value    
Non-redeemable 0 3
Redeemable 153 153
Total fair value 153 156
Unfunded commitments 31 46
Funds held in other investments | Others | Private equity funds
    
Schedule of Investments, Fair Value Calculated Using Net Asset Value    
Non-redeemable 706 846
Redeemable 0 0
Total fair value 706 846
Unfunded commitments 250 198
Bank
    
Schedule of Investments, Fair Value Calculated Using Net Asset Value    
Non-redeemable 4,037 4,494
Redeemable 3,458 4,297
Total fair value 7,495 8,791
Unfunded commitments 863 1,272
Investments, Fair Value Calculated Using Net Asset Value, Additional Disclosures    
Nonredeemable attributable to non-controlling interest 1,819 1,958
Redeemable attributable to non-controlling interest 107 107
Unfunded commitments attributable to non-controlling interest 405 418
Bank | Funds held in trading assets and liabilities
    
Schedule of Investments, Fair Value Calculated Using Net Asset Value    
Non-redeemable 29 179
Redeemable 3,097 3,737
Total fair value 3,126 3,916
Unfunded commitments 0 0
Bank | Funds held in trading assets and liabilities | Debt funds
    
Schedule of Investments, Fair Value Calculated Using Net Asset Value    
Non-redeemable 1 127
Redeemable 18 38
Total fair value 19 165
Unfunded commitments 0 0
Bank | Funds held in trading assets and liabilities | Equity funds
    
Schedule of Investments, Fair Value Calculated Using Net Asset Value    
Non-redeemable 28 52
Redeemable 3,096 3,810
Total fair value 3,124 3,862
Unfunded commitments 0 0
Investments, Fair Value Calculated Using Net Asset Value, Additional Disclosures    
Percentage of investment subject to on demand redemption 55.00% 57.00%
Percentage of investment subject to monthly redemption 17.00% 13.00%
Percentage of investment subject to quarterly redemption 9.00% 13.00%
Percentage of investment subject to annual redemption 19.00% 17.00%
Bank | Funds held in trading assets and liabilities | Equity funds sold short
    
Schedule of Investments, Fair Value Calculated Using Net Asset Value    
Non-redeemable 0 0
Redeemable (17) (111)
Total fair value (17) (111)
Unfunded commitments 0 0
Bank | Funds held in other investments
    
Schedule of Investments, Fair Value Calculated Using Net Asset Value    
Non-redeemable 4,008 4,315
Redeemable 361 560
Total fair value 4,369 4,875
Unfunded commitments 863 1,272
Bank | Funds held in other investments | Hedge funds
    
Schedule of Investments, Fair Value Calculated Using Net Asset Value    
Non-redeemable 320 75
Redeemable 361 560
Total fair value 681 635
Unfunded commitments 37 203
Investments, Fair Value Calculated Using Net Asset Value, Additional Disclosures    
Percentage of investment subject to on demand redemption 33.00% 19.00%
Percentage of investment subject to quarterly redemption 45.00% 66.00%
Percentage of investment subject to annual redemption 21.00% 11.00%
Bank | Funds held in other investments | Private equity funds
    
Schedule of Investments, Fair Value Calculated Using Net Asset Value    
Non-redeemable 3,339 3,855
Redeemable 0 0
Total fair value 3,339 3,855
Unfunded commitments 826 1,069
Bank | Funds held in other investments | Equity method investments
    
Schedule of Investments, Fair Value Calculated Using Net Asset Value    
Non-redeemable 349 385
Redeemable 0 0
Total fair value 349 385
Unfunded commitments 0 0
Bank | Funds held in other investments | Debt funds | Hedge funds
    
Schedule of Investments, Fair Value Calculated Using Net Asset Value    
Non-redeemable 320 68
Redeemable 183 365
Total fair value 503 433
Unfunded commitments 6 157
Bank | Funds held in other investments | Debt funds | Private equity funds
    
Schedule of Investments, Fair Value Calculated Using Net Asset Value    
Non-redeemable 53 97
Redeemable 0 0
Total fair value 53 97
Unfunded commitments 2 17
Bank | Funds held in other investments | Equity funds | Hedge funds
    
Schedule of Investments, Fair Value Calculated Using Net Asset Value    
Non-redeemable 0 3
Redeemable 25 43
Total fair value 25 46
Unfunded commitments 0 0
Bank | Funds held in other investments | Equity funds | Private equity funds
    
Schedule of Investments, Fair Value Calculated Using Net Asset Value    
Non-redeemable 2,230 2,530
Redeemable 0 0
Total fair value 2,230 2,530
Unfunded commitments 464 723
Bank | Funds held in other investments | Real estate funds | Private equity funds
    
Schedule of Investments, Fair Value Calculated Using Net Asset Value    
Non-redeemable 350 382
Redeemable 0 0
Total fair value 350 382
Unfunded commitments 110 131
Bank | Funds held in other investments | Others | Hedge funds
    
Schedule of Investments, Fair Value Calculated Using Net Asset Value    
Non-redeemable 0 4
Redeemable 153 152
Total fair value 153 156
Unfunded commitments 31 46
Bank | Funds held in other investments | Others | Private equity funds
    
Schedule of Investments, Fair Value Calculated Using Net Asset Value    
Non-redeemable 706 846
Redeemable 0 0
Total fair value 706 846
Unfunded commitments 250 198