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Derivatives and hedging activities - Fair value - balance sheet related (Details) - CHF (SFr) SFr in Billions	6 Months Ended
	Jun. 30, 2023	Dec. 31, 2022
Fair value of derivative instruments
Notional amount	SFr 12,110.1	SFr 14,539.1
Positive replacement value (PRV)	68.1	89.1
Negative replacement value (NRV)	SFr 71.0	90.9
Cash flow hedges
Maximum Length of Time Hedged in Cash Flow Hedge	12 months
Not designated for hedge accounting
Fair value of derivative instruments
Notional amount	SFr 11,952.8	14,391.3
Positive replacement value (PRV)	67.9	88.9
Negative replacement value (NRV)	69.3	88.9
Not designated for hedge accounting | Interest rate derivatives
Fair value of derivative instruments
Notional amount	10,299.6	12,053.7
Positive replacement value (PRV)	26.4	34.2
Negative replacement value (NRV)	25.6	32.0
Not designated for hedge accounting | Interest rate derivatives | Forwards and forward rate agreements
Fair value of derivative instruments
Notional amount	2,196.6	2,088.2
Positive replacement value (PRV)	0.1	1.7
Negative replacement value (NRV)	0.1	1.7
Not designated for hedge accounting | Interest rate derivatives | Swaps
Fair value of derivative instruments
Notional amount	7,405.9	9,140.3
Positive replacement value (PRV)	19.9	24.3
Negative replacement value (NRV)	18.8	21.7
Not designated for hedge accounting | Interest rate derivatives | Options bought and sold (OTC)
Fair value of derivative instruments
Notional amount	554.2	644.4
Positive replacement value (PRV)	6.4	8.2
Negative replacement value (NRV)	6.7	8.6
Not designated for hedge accounting | Interest rate derivatives | Futures
Fair value of derivative instruments
Notional amount	142.1	144.9
Positive replacement value (PRV)	0.0	0.0
Negative replacement value (NRV)	0.0	0.0
Not designated for hedge accounting | Interest rate derivatives | Options bought and sold (exchange traded)
Fair value of derivative instruments
Notional amount	0.8	35.9
Positive replacement value (PRV)	0.0	0.0
Negative replacement value (NRV)	0.0	0.0
Not designated for hedge accounting | Foreign exchange derivatives
Fair value of derivative instruments
Notional amount	817.3	1,229.3
Positive replacement value (PRV)	15.9	25.5
Negative replacement value (NRV)	16.8	26.2
Not designated for hedge accounting | Foreign exchange derivatives | Forwards
Fair value of derivative instruments
Notional amount	389.3	701.4
Positive replacement value (PRV)	3.9	8.7
Negative replacement value (NRV)	4.0	10.0
Not designated for hedge accounting | Foreign exchange derivatives | Swaps
Fair value of derivative instruments
Notional amount	318.3	353.5
Positive replacement value (PRV)	10.0	14.3
Negative replacement value (NRV)	10.8	13.5
Not designated for hedge accounting | Foreign exchange derivatives | Options bought and sold (OTC)
Fair value of derivative instruments
Notional amount	105.0	167.5
Positive replacement value (PRV)	2.0	2.5
Negative replacement value (NRV)	2.0	2.7
Not designated for hedge accounting | Foreign exchange derivatives | Futures
Fair value of derivative instruments
Notional amount	3.0	4.1
Positive replacement value (PRV)	0.0	0.0
Negative replacement value (NRV)	0.0	0.0
Not designated for hedge accounting | Foreign exchange derivatives | Options bought and sold (exchange traded)
Fair value of derivative instruments
Notional amount	1.7	2.8
Positive replacement value (PRV)	0.0	0.0
Negative replacement value (NRV)	0.0	0.0
Not designated for hedge accounting | Credit derivatives
Fair value of derivative instruments
Notional amount	260.7	352.0
Positive replacement value (PRV)	2.1	3.2
Negative replacement value (NRV)	2.7	3.4
Not designated for hedge accounting | Equity/index-related derivatives
Fair value of derivative instruments
Notional amount	550.5	715.8
Positive replacement value (PRV)	22.6	25.0
Negative replacement value (NRV)	23.7	26.7
Not designated for hedge accounting | Equity/index-related derivatives | Forwards
Fair value of derivative instruments
Notional amount	0.1	0.3
Positive replacement value (PRV)	0.0	0.0
Negative replacement value (NRV)	0.0	0.0
Not designated for hedge accounting | Equity/index-related derivatives | Swaps
Fair value of derivative instruments
Notional amount	17.6	22.8
Positive replacement value (PRV)	0.9	0.9
Negative replacement value (NRV)	0.4	0.7
Not designated for hedge accounting | Equity/index-related derivatives | Options bought and sold (OTC)
Fair value of derivative instruments
Notional amount	145.5	181.4
Positive replacement value (PRV)	5.4	5.2
Negative replacement value (NRV)	7.9	7.5
Not designated for hedge accounting | Equity/index-related derivatives | Futures
Fair value of derivative instruments
Notional amount	13.6	42.0
Positive replacement value (PRV)	0.0	0.0
Negative replacement value (NRV)	0.0	0.0
Not designated for hedge accounting | Equity/index-related derivatives | Options bought and sold (exchange traded)
Fair value of derivative instruments
Notional amount	373.7	469.3
Positive replacement value (PRV)	16.3	18.9
Negative replacement value (NRV)	15.4	18.5
Not designated for hedge accounting | Other products
Fair value of derivative instruments
Notional amount	24.7	40.5
Positive replacement value (PRV)	0.9	1.0
Negative replacement value (NRV)	0.5	0.6
Not designated for hedge accounting | Other products | Forwards
Fair value of derivative instruments
Notional amount	5.0	6.9
Positive replacement value (PRV)	0.1	0.1
Negative replacement value (NRV)	0.1	0.1
Not designated for hedge accounting | Other products | Swaps
Fair value of derivative instruments
Notional amount	6.7	9.5
Positive replacement value (PRV)	0.6	0.7
Negative replacement value (NRV)	0.3	0.4
Not designated for hedge accounting | Other products | Options bought and sold (OTC)
Fair value of derivative instruments
Notional amount	7.0	8.8
Positive replacement value (PRV)	0.1	0.1
Negative replacement value (NRV)	0.1	0.1
Not designated for hedge accounting | Other products | Futures
Fair value of derivative instruments
Notional amount	3.1	12.6
Positive replacement value (PRV)	0.0	0.0
Negative replacement value (NRV)	0.0	0.0
Not designated for hedge accounting | Other products | Options bought and sold (exchange traded)
Fair value of derivative instruments
Notional amount	2.9	2.7
Positive replacement value (PRV)	0.1	0.1
Negative replacement value (NRV)	0.0	0.0
Designated for hedge accounting
Fair value of derivative instruments
Notional amount	157.3	147.8
Positive replacement value (PRV)	0.2	0.2
Negative replacement value (NRV)	1.7	2.0
Designated for hedge accounting | Interest rate derivatives
Fair value of derivative instruments
Notional amount	129.8	130.1
Positive replacement value (PRV)	0.1	0.1
Negative replacement value (NRV)	1.7	1.8
Designated for hedge accounting | Interest rate derivatives | Forwards and forward rate agreements
Fair value of derivative instruments
Notional amount	0.0	0.0
Positive replacement value (PRV)	0.0	0.0
Negative replacement value (NRV)	0.0	0.0
Designated for hedge accounting | Interest rate derivatives | Swaps
Fair value of derivative instruments
Notional amount	129.8	130.1
Positive replacement value (PRV)	0.1	0.1
Negative replacement value (NRV)	1.7	1.8
Designated for hedge accounting | Interest rate derivatives | Options bought and sold (OTC)
Fair value of derivative instruments
Notional amount	0.0	0.0
Positive replacement value (PRV)	0.0	0.0
Negative replacement value (NRV)	0.0	0.0
Designated for hedge accounting | Interest rate derivatives | Futures
Fair value of derivative instruments
Notional amount	0.0	0.0
Positive replacement value (PRV)	0.0	0.0
Negative replacement value (NRV)	0.0	0.0
Designated for hedge accounting | Interest rate derivatives | Options bought and sold (exchange traded)
Fair value of derivative instruments
Notional amount	0.0	0.0
Positive replacement value (PRV)	0.0	0.0
Negative replacement value (NRV)	0.0	0.0
Designated for hedge accounting | Foreign exchange derivatives
Fair value of derivative instruments
Notional amount	27.5	17.7
Positive replacement value (PRV)	0.1	0.1
Negative replacement value (NRV)	0.0	0.2
Designated for hedge accounting | Foreign exchange derivatives | Forwards
Fair value of derivative instruments
Notional amount	27.5	17.7
Positive replacement value (PRV)	0.1	0.1
Negative replacement value (NRV)	0.0	0.2
Designated for hedge accounting | Foreign exchange derivatives | Swaps
Fair value of derivative instruments
Notional amount	0.0	0.0
Positive replacement value (PRV)	0.0	0.0
Negative replacement value (NRV)	0.0	0.0
Designated for hedge accounting | Foreign exchange derivatives | Options bought and sold (OTC)
Fair value of derivative instruments
Notional amount	0.0	0.0
Positive replacement value (PRV)	0.0	0.0
Negative replacement value (NRV)	0.0	0.0
Designated for hedge accounting | Foreign exchange derivatives | Futures
Fair value of derivative instruments
Notional amount	0.0	0.0
Positive replacement value (PRV)	0.0	0.0
Negative replacement value (NRV)	0.0	0.0
Designated for hedge accounting | Foreign exchange derivatives | Options bought and sold (exchange traded)
Fair value of derivative instruments
Notional amount	0.0	0.0
Positive replacement value (PRV)	0.0	0.0
Negative replacement value (NRV)	0.0	0.0
Designated for hedge accounting | Credit derivatives
Fair value of derivative instruments
Notional amount	0.0	0.0
Positive replacement value (PRV)	0.0	0.0
Negative replacement value (NRV)	0.0	0.0
Designated for hedge accounting | Equity/index-related derivatives
Fair value of derivative instruments
Notional amount	0.0	0.0
Positive replacement value (PRV)	0.0	0.0
Negative replacement value (NRV)	0.0	0.0
Designated for hedge accounting | Equity/index-related derivatives | Forwards
Fair value of derivative instruments
Notional amount	0.0	0.0
Positive replacement value (PRV)	0.0	0.0
Negative replacement value (NRV)	0.0	0.0
Designated for hedge accounting | Equity/index-related derivatives | Swaps
Fair value of derivative instruments
Notional amount	0.0	0.0
Positive replacement value (PRV)	0.0	0.0
Negative replacement value (NRV)	0.0	0.0
Designated for hedge accounting | Equity/index-related derivatives | Options bought and sold (OTC)
Fair value of derivative instruments
Notional amount	0.0	0.0
Positive replacement value (PRV)	0.0	0.0
Negative replacement value (NRV)	0.0	0.0
Designated for hedge accounting | Equity/index-related derivatives | Futures
Fair value of derivative instruments
Notional amount	0.0	0.0
Positive replacement value (PRV)	0.0	0.0
Negative replacement value (NRV)	0.0	0.0
Designated for hedge accounting | Equity/index-related derivatives | Options bought and sold (exchange traded)
Fair value of derivative instruments
Notional amount	0.0	0.0
Positive replacement value (PRV)	0.0	0.0
Negative replacement value (NRV)	0.0	0.0
Designated for hedge accounting | Other products
Fair value of derivative instruments
Notional amount	0.0	0.0
Positive replacement value (PRV)	0.0	0.0
Negative replacement value (NRV)	0.0	0.0
Designated for hedge accounting | Other products | Forwards
Fair value of derivative instruments
Notional amount	0.0	0.0
Positive replacement value (PRV)	0.0	0.0
Negative replacement value (NRV)	0.0	0.0
Designated for hedge accounting | Other products | Swaps
Fair value of derivative instruments
Notional amount	0.0	0.0
Positive replacement value (PRV)	0.0	0.0
Negative replacement value (NRV)	0.0	0.0
Designated for hedge accounting | Other products | Options bought and sold (OTC)
Fair value of derivative instruments
Notional amount	0.0	0.0
Positive replacement value (PRV)	0.0	0.0
Negative replacement value (NRV)	0.0	0.0
Designated for hedge accounting | Other products | Futures
Fair value of derivative instruments
Notional amount	0.0	0.0
Positive replacement value (PRV)	0.0	0.0
Negative replacement value (NRV)	0.0	0.0
Designated for hedge accounting | Other products | Options bought and sold (exchange traded)
Fair value of derivative instruments
Notional amount	0.0	0.0
Positive replacement value (PRV)	0.0	0.0
Negative replacement value (NRV)	SFr 0.0	SFr 0.0

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- Definition

Fair value, before effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets elected not to be offset. Includes assets not subject to a master netting arrangement.

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Fair value, before effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes liabilities elected not to be offset. Includes liabilities not subject to a master netting arrangement.

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Nominal or face amount used to calculate payment on derivative.

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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
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