Trading revenues (Details) (CHF) In Millions, unless otherwise specified	12 Months Ended
Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Trading revenues
Trading revenues	1,195	5,020	9,338
Interest rate products
Trading revenues
Trading revenues	2,707	6,794	5,866
Foreign exchange products
Trading revenues
Trading revenues	559	(4,433)	2,258
Equity/index-related products
Trading revenues
Trading revenues	139	1,644	2,211
Credit products
Trading revenues
Trading revenues	(3,306)	522	(1,644)
Commodity, emission and energy products
Trading revenues
Trading revenues	198	361	323
Other products
Trading revenues
Trading revenues	898	132	324
Bank
Trading revenues
Trading revenues	1,328	4,740	9,214
Bank \| Interest rate products
Trading revenues
Trading revenues	2,868	6,578	5,673
Bank \| Foreign exchange products
Trading revenues
Trading revenues	560	(4,456)	2,232
Bank \| Equity/index-related products
Trading revenues
Trading revenues	111	1,604	2,306
Bank \| Credit products
Trading revenues
Trading revenues	(3,306)	522	(1,644)
Bank \| Commodity, emission and energy products
Trading revenues
Trading revenues	198	361	323
Bank \| Other products
Trading revenues
Trading revenues	897	131	324

- Definition

The profit or loss resulting from the difference between the acquisition cost and the selling price or current market or fair value when a broker-dealer or other financial entity buys and sells securities exclusively for its own account, sometimes referred to as proprietary trading. The net gain (loss) includes both realized and unrealized from trading cash instruments, equities and derivative contracts (including commodity contracts) that has been recognized during the accounting period for the broker dealer or other financial entity's own account. Trading revenue may include: (1) Revaluation adjustments to the carrying value of cash instruments reported as Trading assets, and Trading liabilities, resulting from the periodic marking to market of such instruments. (2) Revaluation adjustments from the periodic marking to market of interest rate, foreign exchange, equity derivative, and commodity and other derivative contracts held for trading. (3) Incidental income and expense related to the purchase and sale of cash instruments reported as Trading assets, and Trading liabilities, and derivative contracts held for trading.

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