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Pension and other post-retirement benefits - Plan assets measured at fair value roll-forward (Details 4) - CHF (SFr) SFr in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Debt securities
Defined Benefit Plan, Change in Fair Value of Plan Assets, Level 3 Reconciliation [Roll Forward]
Beginning of the measurement period	SFr 5
End of the measurement period	6	SFr 5
Equity securities
Defined Benefit Plan, Change in Fair Value of Plan Assets, Level 3 Reconciliation [Roll Forward]
Beginning of the measurement period	3
End of the measurement period	2	3
Defined benefit pension plans
Defined Benefit Plan, Change in Fair Value of Plan Assets, Level 3 Reconciliation [Roll Forward]
Beginning of the measurement period	23,098
End of the measurement period	19,647	23,098
Defined benefit pension plans | Level 3
Defined Benefit Plan, Change in Fair Value of Plan Assets, Level 3 Reconciliation [Roll Forward]
Beginning of the measurement period	1,514	1,444
Transfers In	0	0
Transfers Out	0	0
On assets still held at reporting date	49	65
On assets sold during the period	0	0
Purchases, sales, settlements	5	5
Foreign currency translation impact	0	0
End of the measurement period	1,568	1,514
Defined benefit pension plans | Level 3 | Real estate
Defined Benefit Plan, Change in Fair Value of Plan Assets, Level 3 Reconciliation [Roll Forward]
Beginning of the measurement period	1,514	1,444
Transfers In	0	0
Transfers Out	0	0
On assets still held at reporting date	49	65
On assets sold during the period	0	0
Purchases, sales, settlements	5	5
Foreign currency translation impact	0	0
End of the measurement period	1,568	1,514
Defined benefit pension plans | Level 3 | Real estate - direct
Defined Benefit Plan, Change in Fair Value of Plan Assets, Level 3 Reconciliation [Roll Forward]
Beginning of the measurement period	1,514	1,444
Transfers In	0	0
Transfers Out	0	0
On assets still held at reporting date	49	65
On assets sold during the period	0	0
Purchases, sales, settlements	5	5
Foreign currency translation impact	0	0
End of the measurement period	1,568	1,514
Switzerland | Defined benefit pension plans
Defined Benefit Plan, Change in Fair Value of Plan Assets, Level 3 Reconciliation [Roll Forward]
Beginning of the measurement period	19,296	18,000
Foreign currency translation impact	0	0
End of the measurement period	17,331	19,296
Switzerland | Defined benefit pension plans | Debt securities
Defined Benefit Plan, Change in Fair Value of Plan Assets, Level 3 Reconciliation [Roll Forward]
Beginning of the measurement period	6,784
End of the measurement period	7,535	6,784
Switzerland | Defined benefit pension plans | Corporate debt securities
Defined Benefit Plan, Change in Fair Value of Plan Assets, Level 3 Reconciliation [Roll Forward]
Beginning of the measurement period	6,784
End of the measurement period	7,535	6,784
Switzerland | Defined benefit pension plans | Equity securities
Defined Benefit Plan, Change in Fair Value of Plan Assets, Level 3 Reconciliation [Roll Forward]
Beginning of the measurement period	5,264
End of the measurement period	2,799	5,264
Switzerland | Defined benefit pension plans | Real estate
Defined Benefit Plan, Change in Fair Value of Plan Assets, Level 3 Reconciliation [Roll Forward]
Beginning of the measurement period	3,554
End of the measurement period	3,693	3,554
Switzerland | Defined benefit pension plans | Real estate - direct
Defined Benefit Plan, Change in Fair Value of Plan Assets, Level 3 Reconciliation [Roll Forward]
Beginning of the measurement period	1,514
End of the measurement period	1,568	1,514
Switzerland | Defined benefit pension plans | Real estate - indirect
Defined Benefit Plan, Change in Fair Value of Plan Assets, Level 3 Reconciliation [Roll Forward]
Beginning of the measurement period	2,040
End of the measurement period	2,125	2,040
Switzerland | Defined benefit pension plans | Alternative investments
Defined Benefit Plan, Change in Fair Value of Plan Assets, Level 3 Reconciliation [Roll Forward]
Beginning of the measurement period	3,381
End of the measurement period	3,069	3,381
Switzerland | Defined benefit pension plans | Private equity - alternative investments
Defined Benefit Plan, Change in Fair Value of Plan Assets, Level 3 Reconciliation [Roll Forward]
Beginning of the measurement period	2,431
End of the measurement period	2,526	2,431
Switzerland | Defined benefit pension plans | Hedge funds
Defined Benefit Plan, Change in Fair Value of Plan Assets, Level 3 Reconciliation [Roll Forward]
Beginning of the measurement period	221
End of the measurement period	0	221
Switzerland | Defined benefit pension plans | Other alternative investments
Defined Benefit Plan, Change in Fair Value of Plan Assets, Level 3 Reconciliation [Roll Forward]
Beginning of the measurement period	729
End of the measurement period	543	729
Switzerland | Defined benefit pension plans | Level 3
Defined Benefit Plan, Change in Fair Value of Plan Assets, Level 3 Reconciliation [Roll Forward]
Beginning of the measurement period	1,514	1,444
Transfers In	0	0
Transfers Out	0	0
On assets still held at reporting date	49	65
On assets sold during the period	0	0
Purchases, sales, settlements	5	5
Exchange rate gains/(losses) on investments	0	0
End of the measurement period	1,568	1,514
Switzerland | Defined benefit pension plans | Level 3 | Debt securities
Defined Benefit Plan, Change in Fair Value of Plan Assets, Level 3 Reconciliation [Roll Forward]
Beginning of the measurement period	0
End of the measurement period	0	0
Switzerland | Defined benefit pension plans | Level 3 | Corporate debt securities
Defined Benefit Plan, Change in Fair Value of Plan Assets, Level 3 Reconciliation [Roll Forward]
Beginning of the measurement period	0
End of the measurement period	0	0
Switzerland | Defined benefit pension plans | Level 3 | Equity securities
Defined Benefit Plan, Change in Fair Value of Plan Assets, Level 3 Reconciliation [Roll Forward]
Beginning of the measurement period	0
End of the measurement period	0	0
Switzerland | Defined benefit pension plans | Level 3 | Real estate
Defined Benefit Plan, Change in Fair Value of Plan Assets, Level 3 Reconciliation [Roll Forward]
Beginning of the measurement period	1,514
End of the measurement period	1,568	1,514
Switzerland | Defined benefit pension plans | Level 3 | Real estate - direct
Defined Benefit Plan, Change in Fair Value of Plan Assets, Level 3 Reconciliation [Roll Forward]
Beginning of the measurement period	1,514
End of the measurement period	1,568	1,514
Switzerland | Defined benefit pension plans | Level 3 | Real estate - indirect
Defined Benefit Plan, Change in Fair Value of Plan Assets, Level 3 Reconciliation [Roll Forward]
Beginning of the measurement period	0
End of the measurement period	0	0
Switzerland | Defined benefit pension plans | Level 3 | Alternative investments
Defined Benefit Plan, Change in Fair Value of Plan Assets, Level 3 Reconciliation [Roll Forward]
Beginning of the measurement period	0
End of the measurement period	0	0
Switzerland | Defined benefit pension plans | Level 3 | Private equity - alternative investments
Defined Benefit Plan, Change in Fair Value of Plan Assets, Level 3 Reconciliation [Roll Forward]
Beginning of the measurement period	0
End of the measurement period	0	0
Switzerland | Defined benefit pension plans | Level 3 | Hedge funds
Defined Benefit Plan, Change in Fair Value of Plan Assets, Level 3 Reconciliation [Roll Forward]
Beginning of the measurement period	0
End of the measurement period	0	0
Switzerland | Defined benefit pension plans | Level 3 | Other alternative investments
Defined Benefit Plan, Change in Fair Value of Plan Assets, Level 3 Reconciliation [Roll Forward]
Beginning of the measurement period	0
End of the measurement period	0	0
International | Defined benefit pension plans
Defined Benefit Plan, Change in Fair Value of Plan Assets, Level 3 Reconciliation [Roll Forward]
Beginning of the measurement period	3,802	4,212
Foreign currency translation impact	(262)	132
End of the measurement period	2,316	3,802
International | Defined benefit pension plans | Debt securities
Defined Benefit Plan, Change in Fair Value of Plan Assets, Level 3 Reconciliation [Roll Forward]
Beginning of the measurement period	3,531
End of the measurement period	2,070	3,531
International | Defined benefit pension plans | Corporate debt securities
Defined Benefit Plan, Change in Fair Value of Plan Assets, Level 3 Reconciliation [Roll Forward]
Beginning of the measurement period	1,199
End of the measurement period	804	1,199
International | Defined benefit pension plans | Government debt securities
Defined Benefit Plan, Change in Fair Value of Plan Assets, Level 3 Reconciliation [Roll Forward]
Beginning of the measurement period	2,332
End of the measurement period	1,266	2,332
International | Defined benefit pension plans | Equity securities
Defined Benefit Plan, Change in Fair Value of Plan Assets, Level 3 Reconciliation [Roll Forward]
Beginning of the measurement period	101
End of the measurement period	106	101
International | Defined benefit pension plans | Alternative investments
Defined Benefit Plan, Change in Fair Value of Plan Assets, Level 3 Reconciliation [Roll Forward]
Beginning of the measurement period	(27)
End of the measurement period	(59)	(27)
International | Defined benefit pension plans | Other alternative investments
Defined Benefit Plan, Change in Fair Value of Plan Assets, Level 3 Reconciliation [Roll Forward]
Beginning of the measurement period	(27)
End of the measurement period	(59)	(27)
International | Defined benefit pension plans | Other investments, plan assets
Defined Benefit Plan, Change in Fair Value of Plan Assets, Level 3 Reconciliation [Roll Forward]
Beginning of the measurement period	87
End of the measurement period	81	87
International | Defined benefit pension plans | Level 3
Defined Benefit Plan, Change in Fair Value of Plan Assets, Level 3 Reconciliation [Roll Forward]
Beginning of the measurement period	0
End of the measurement period	0	0
International | Defined benefit pension plans | Level 3 | Debt securities
Defined Benefit Plan, Change in Fair Value of Plan Assets, Level 3 Reconciliation [Roll Forward]
Beginning of the measurement period	0
End of the measurement period	0	0
International | Defined benefit pension plans | Level 3 | Corporate debt securities
Defined Benefit Plan, Change in Fair Value of Plan Assets, Level 3 Reconciliation [Roll Forward]
Beginning of the measurement period	0
End of the measurement period	0	0
International | Defined benefit pension plans | Level 3 | Government debt securities
Defined Benefit Plan, Change in Fair Value of Plan Assets, Level 3 Reconciliation [Roll Forward]
Beginning of the measurement period	0
End of the measurement period	0	0
International | Defined benefit pension plans | Level 3 | Equity securities
Defined Benefit Plan, Change in Fair Value of Plan Assets, Level 3 Reconciliation [Roll Forward]
Beginning of the measurement period	0
End of the measurement period	0	0
International | Defined benefit pension plans | Level 3 | Alternative investments
Defined Benefit Plan, Change in Fair Value of Plan Assets, Level 3 Reconciliation [Roll Forward]
Beginning of the measurement period	0
End of the measurement period	0	0
International | Defined benefit pension plans | Level 3 | Other alternative investments
Defined Benefit Plan, Change in Fair Value of Plan Assets, Level 3 Reconciliation [Roll Forward]
Beginning of the measurement period	0
End of the measurement period	0	0
International | Defined benefit pension plans | Level 3 | Other investments, plan assets
Defined Benefit Plan, Change in Fair Value of Plan Assets, Level 3 Reconciliation [Roll Forward]
Beginning of the measurement period	0
End of the measurement period	0	0
International | Other post-retirement defined benefit plans
Defined Benefit Plan, Change in Fair Value of Plan Assets, Level 3 Reconciliation [Roll Forward]
Beginning of the measurement period	0	0
Foreign currency translation impact	0	0
End of the measurement period	0	0
Bank | International | Defined benefit pension plans
Defined Benefit Plan, Change in Fair Value of Plan Assets, Level 3 Reconciliation [Roll Forward]
Beginning of the measurement period	3,802	4,212
Foreign currency translation impact	(262)	132
End of the measurement period	2,316	3,802
Bank | International | Defined benefit pension plans | Debt securities
Defined Benefit Plan, Change in Fair Value of Plan Assets, Level 3 Reconciliation [Roll Forward]
Beginning of the measurement period	3,531
End of the measurement period	2,070	3,531
Bank | International | Defined benefit pension plans | Corporate debt securities
Defined Benefit Plan, Change in Fair Value of Plan Assets, Level 3 Reconciliation [Roll Forward]
Beginning of the measurement period	1,199
End of the measurement period	804	1,199
Bank | International | Defined benefit pension plans | Government debt securities
Defined Benefit Plan, Change in Fair Value of Plan Assets, Level 3 Reconciliation [Roll Forward]
Beginning of the measurement period	2,332
End of the measurement period	1,266	2,332
Bank | International | Defined benefit pension plans | Equity securities
Defined Benefit Plan, Change in Fair Value of Plan Assets, Level 3 Reconciliation [Roll Forward]
Beginning of the measurement period	101
End of the measurement period	106	101
Bank | International | Defined benefit pension plans | Alternative investments
Defined Benefit Plan, Change in Fair Value of Plan Assets, Level 3 Reconciliation [Roll Forward]
Beginning of the measurement period	(27)
End of the measurement period	(59)	(27)
Bank | International | Defined benefit pension plans | Other alternative investments
Defined Benefit Plan, Change in Fair Value of Plan Assets, Level 3 Reconciliation [Roll Forward]
Beginning of the measurement period	(27)
End of the measurement period	(59)	(27)
Bank | International | Defined benefit pension plans | Other investments, plan assets
Defined Benefit Plan, Change in Fair Value of Plan Assets, Level 3 Reconciliation [Roll Forward]
Beginning of the measurement period	87
End of the measurement period	81	87
Bank | International | Defined benefit pension plans | Level 3
Defined Benefit Plan, Change in Fair Value of Plan Assets, Level 3 Reconciliation [Roll Forward]
Beginning of the measurement period	0
End of the measurement period	0	0
Bank | International | Defined benefit pension plans | Level 3 | Debt securities
Defined Benefit Plan, Change in Fair Value of Plan Assets, Level 3 Reconciliation [Roll Forward]
Beginning of the measurement period	0
End of the measurement period	0	0
Bank | International | Defined benefit pension plans | Level 3 | Corporate debt securities
Defined Benefit Plan, Change in Fair Value of Plan Assets, Level 3 Reconciliation [Roll Forward]
Beginning of the measurement period	0
End of the measurement period	0	0
Bank | International | Defined benefit pension plans | Level 3 | Government debt securities
Defined Benefit Plan, Change in Fair Value of Plan Assets, Level 3 Reconciliation [Roll Forward]
Beginning of the measurement period	0
End of the measurement period	0	0
Bank | International | Defined benefit pension plans | Level 3 | Equity securities
Defined Benefit Plan, Change in Fair Value of Plan Assets, Level 3 Reconciliation [Roll Forward]
Beginning of the measurement period	0
End of the measurement period	0	0
Bank | International | Defined benefit pension plans | Level 3 | Alternative investments
Defined Benefit Plan, Change in Fair Value of Plan Assets, Level 3 Reconciliation [Roll Forward]
Beginning of the measurement period	0
End of the measurement period	0	0
Bank | International | Defined benefit pension plans | Level 3 | Other alternative investments
Defined Benefit Plan, Change in Fair Value of Plan Assets, Level 3 Reconciliation [Roll Forward]
Beginning of the measurement period	0
End of the measurement period	0	0
Bank | International | Defined benefit pension plans | Level 3 | Other investments, plan assets
Defined Benefit Plan, Change in Fair Value of Plan Assets, Level 3 Reconciliation [Roll Forward]
Beginning of the measurement period	0
End of the measurement period	0	0
Bank | International | Other post-retirement defined benefit plans
Defined Benefit Plan, Change in Fair Value of Plan Assets, Level 3 Reconciliation [Roll Forward]
Beginning of the measurement period	0	0
Foreign currency translation impact	0	0
End of the measurement period	SFr 0	SFr 0

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Amount, measured using unobservable inputs, of increase (decrease) in plan assets of defined benefit plan from actual return (loss) on assets sold.

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Amount of asset segregated and restricted to provide benefit under defined benefit plan. Asset includes, but is not limited to, stock, bond, other investment, earning from investment, and contribution by employer and employee.

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Amount of foreign currency translation gain (loss) which increases (decreases) plan assets of defined benefit plan.

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