Leases (Details 2) - CHF (SFr)
SFr in Millions
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Lessor Disclosure [Line Items]      
Residual Value of Leased Asset SFr 1,100 SFr 900  
Lease income [Abstract]      
Sales-type Lease, Unguaranteed Residual Asset 119 43  
Direct Financing Lease, Unguaranteed Residual Asset 80 188  
Interest income on sales-type lease receivables 25 19 SFr 13
Interest income on direct financing lease receivables 68 74 97
Lease income from operating leases 76 93 103
Variable lease income 1 0 3
Total lease income 170 186 216
Net Investment in Lease [Abstract]      
Lease receivables, Sales-type leases 1,107 862  
Impairment recognized, Sales-type leases 7 6  
Total net investment, Sales-type Lease 1,219 899  
Lease receivables, Direct financing leases 2,395 2,299  
Impairment recognized, Direct financing leases 18 23  
Total net investment, Direct financing leases 2,457 2,464  
Lessor, Operating Lease, Payments, Rolling Maturity [Abstract]      
Due within 1 year 46 48  
Due between 1 and 2 years 43 41  
Due between 2 and 3 years 42 37  
Due between 3 and 4 years 40 36  
Due between 4 and 5 years 37 34  
Thereafter 34 63  
Total SFr 242 259  
Lessor, lease options Certain leases include i) termination options that allow lessees to terminate the leases within three months of the commencement date, with a notice period of 30 days; ii) termination options that allow the Group to terminate the lease but do not provide the lessee with the same option; iii) termination penalties; iv) options to prepay the payments for the remaining lease term; or v) options that permit the lessee to purchase the leased asset at market value or at the greater of market value and the net present value of the remaining payments.    
Sales-type leases [Member]      
Sales-type and Direct Financing Leases, Lease Receivable, Rolling Maturity [Abstract]      
Due within 1 year SFr 467 359  
Due between 1 and 2 years 263 213  
Due between 2 and 3 years 179 142  
Due between 3 and 4 years 113 84  
Due between 4 and 5 years 62 43  
Thereafter 83 66  
Total 1,167 907  
Future interest receivable (60) (45)  
Lease receivables 1,107 862  
Direct financing leases [Member]      
Sales-type and Direct Financing Leases, Lease Receivable, Rolling Maturity [Abstract]      
Due within 1 year 727 755  
Due between 1 and 2 years 641 620  
Due between 2 and 3 years 583 514  
Due between 3 and 4 years 458 402  
Due between 4 and 5 years 125 125  
Thereafter 31 48  
Total 2,565 2,464  
Future interest receivable (170) (165)  
Lease receivables 2,395 2,299  
Bank      
Lessor Disclosure [Line Items]      
Residual Value of Leased Asset 1,100 900  
Lease income [Abstract]      
Sales-type Lease, Unguaranteed Residual Asset 119 43  
Direct Financing Lease, Unguaranteed Residual Asset 80 188  
Interest income on sales-type lease receivables 25 19 13
Interest income on direct financing lease receivables 68 74 97
Lease income from operating leases 93 107 119
Variable lease income 1 0 3
Total lease income 187 200 SFr 232
Net Investment in Lease [Abstract]      
Lease receivables, Sales-type leases 1,107 862  
Impairment recognized, Sales-type leases 7 6  
Total net investment, Sales-type Lease 1,219 899  
Lease receivables, Direct financing leases 2,395 2,299  
Impairment recognized, Direct financing leases 18 23  
Total net investment, Direct financing leases 2,457 2,464  
Lessor, Operating Lease, Payments, Rolling Maturity [Abstract]      
Due within 1 year 61 63  
Due between 1 and 2 years 59 57  
Due between 2 and 3 years 59 53  
Due between 3 and 4 years 56 52  
Due between 4 and 5 years 54 50  
Thereafter 177 217  
Total 466 492  
Related Party, Operating Lease 224 234  
Bank | Sales-type leases [Member]      
Sales-type and Direct Financing Leases, Lease Receivable, Rolling Maturity [Abstract]      
Due within 1 year 467 359  
Due between 1 and 2 years 263 213  
Due between 2 and 3 years 179 142  
Due between 3 and 4 years 113 84  
Due between 4 and 5 years 62 43  
Thereafter 83 66  
Total 1,167 907  
Future interest receivable (60) (45)  
Lease receivables 1,107 862  
Bank | Direct financing leases [Member]      
Sales-type and Direct Financing Leases, Lease Receivable, Rolling Maturity [Abstract]      
Due within 1 year 727 755  
Due between 1 and 2 years 641 620  
Due between 2 and 3 years 583 514  
Due between 3 and 4 years 458 402  
Due between 4 and 5 years 125 125  
Thereafter 31 48  
Total 2,565 2,464  
Future interest receivable (170) (165)  
Lease receivables SFr 2,395 SFr 2,299