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FI - Transfers between levels 1 and 2 (Details 14) - Recurring basis - CHF (SFr)
SFr in Millions
Dec. 31, 2017
Dec. 31, 2016
Obligation to return securities received as collateral    
Fair Value, Transfers between level 1 and level 2    
Transfers to level 1 out of level 2 SFr 0 SFr 0
Transfers out of level 1 to level 2 136 0
Trading Liabilities    
Fair Value, Transfers between level 1 and level 2    
Transfers to level 1 out of level 2 3,919 4,157
Transfers out of level 1 to level 2 300 241
Trading Liabilities | Debt securities    
Fair Value, Transfers between level 1 and level 2    
Transfers to level 1 out of level 2 3 2
Transfers out of level 1 to level 2 44 46
Trading Liabilities | Equity securities    
Fair Value, Transfers between level 1 and level 2    
Transfers to level 1 out of level 2 102 108
Transfers out of level 1 to level 2 165 166
Trading Liabilities | Derivative instruments    
Fair Value, Transfers between level 1 and level 2    
Transfers to level 1 out of level 2 3,814 4,047
Transfers out of level 1 to level 2 91 29
Securities received as collateral    
Fair Value, Transfers between level 1 and level 2    
Transfers to level 1 out of level 2 0 0
Transfers out of level 1 to level 2 136 0
Trading assets    
Fair Value, Transfers between level 1 and level 2    
Transfers to level 1 out of level 2 4,142 6,139
Transfers out of level 1 to level 2 662 2,772
Trading assets | Debt securities    
Fair Value, Transfers between level 1 and level 2    
Transfers to level 1 out of level 2 16 2,012
Transfers out of level 1 to level 2 237 1,698
Trading assets | Equity securities    
Fair Value, Transfers between level 1 and level 2    
Transfers to level 1 out of level 2 924 723
Transfers out of level 1 to level 2 412 1,074
Trading assets | Derivative instruments    
Fair Value, Transfers between level 1 and level 2    
Transfers to level 1 out of level 2 3,202 3,404
Transfers out of level 1 to level 2 13 0
Investment securities    
Fair Value, Transfers between level 1 and level 2    
Transfers to level 1 out of level 2 0 0
Transfers out of level 1 to level 2 0 1,229
Bank | Obligation to return securities received as collateral    
Fair Value, Transfers between level 1 and level 2    
Transfers to level 1 out of level 2 0 0
Transfers out of level 1 to level 2 136 0
Bank | Trading Liabilities    
Fair Value, Transfers between level 1 and level 2    
Transfers to level 1 out of level 2 3,919 4,157
Transfers out of level 1 to level 2 300 241
Bank | Trading Liabilities | Debt securities    
Fair Value, Transfers between level 1 and level 2    
Transfers to level 1 out of level 2 3 2
Transfers out of level 1 to level 2 44 46
Bank | Trading Liabilities | Equity securities    
Fair Value, Transfers between level 1 and level 2    
Transfers to level 1 out of level 2 102 108
Transfers out of level 1 to level 2 165 166
Bank | Trading Liabilities | Derivative instruments    
Fair Value, Transfers between level 1 and level 2    
Transfers to level 1 out of level 2 3,814 4,047
Transfers out of level 1 to level 2 91 29
Bank | Securities received as collateral    
Fair Value, Transfers between level 1 and level 2    
Transfers to level 1 out of level 2 0 0
Transfers out of level 1 to level 2 136 0
Bank | Trading assets    
Fair Value, Transfers between level 1 and level 2    
Transfers to level 1 out of level 2 4,142 6,139
Transfers out of level 1 to level 2 662 2,772
Bank | Trading assets | Debt securities    
Fair Value, Transfers between level 1 and level 2    
Transfers to level 1 out of level 2 16 2,012
Transfers out of level 1 to level 2 237 1,698
Bank | Trading assets | Equity securities    
Fair Value, Transfers between level 1 and level 2    
Transfers to level 1 out of level 2 924 723
Transfers out of level 1 to level 2 412 1,074
Bank | Trading assets | Derivative instruments    
Fair Value, Transfers between level 1 and level 2    
Transfers to level 1 out of level 2 3,202 3,404
Transfers out of level 1 to level 2 SFr 13 SFr 0