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Derivatives and hedging activities - Movements (Details 2) - CHF (SFr) SFr in Millions	6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022
Fair value hedges | Interest rate derivatives | Interest and dividend income [Member]
Derivative Instruments, Gain (Loss)
Hedged items	SFr 392	SFr 2,508
Derivatives designated as hedging instruments	(400)	(2,370)
Cash flow hedges
Derivative Instruments, Gain (Loss)
Expected reclassification of net gains/(losses) from AOCI into earnings during the next 12 months	(515)
Cash flow hedges | Interest rate derivatives
Derivative Instruments, Gain (Loss)
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), before Reclassification and Tax	342	(821)
Cash flow hedges | Interest rate derivatives | Interest and dividend income [Member]
Derivative Instruments, Gain (Loss)
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, before Tax	104	177
Cash flow hedges | Foreign exchange derivatives
Derivative Instruments, Gain (Loss)
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), before Reclassification and Tax	17	(50)
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, before Tax	(10)	(22)
Cash flow hedges | Foreign exchange derivatives | Other Expense [Member]
Derivative Instruments, Gain (Loss)
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, before Tax	(10)	(22)
Net investment hedges | Foreign exchange derivatives
Derivative Instruments, Gain (Loss)
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), before Reclassification and Tax	(81)	(57)
Net investment hedges | Foreign exchange derivatives | Other Income [Member]
Derivative Instruments, Gain (Loss)
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, before Tax	SFr 4	SFr 0

X

- Definition

The estimated net amount of existing gains or losses on cash flow hedges at the reporting date expected to be reclassified to earnings within the next 12 months.

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Amount of gain (loss) from the increase (decrease) in fair value of derivative and nonderivative instruments designated as fair value hedging instruments recognized in the income statement.

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Amount of the increase (decrease) in fair value of the hedged item in a fair value hedge recognized in the income statement.

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