CECL (Details 7) - CHF (SFr)
SFr in Millions
Dec. 31, 2021
Dec. 31, 2020
Loans Held At Amortized Cost, Amortized cost, Past Due [Line Items]    
Gross loans held at amortized cost SFr 282,740 SFr 282,036
Total 282,821 282,131
Past due more than 90 days and still accruing 0 0
Financial Asset, Not Past Due [Member]    
Loans Held At Amortized Cost, Amortized cost, Past Due [Line Items]    
Gross loans held at amortized cost 280,409 279,353
Financial Asset, Past Due [Member]    
Loans Held At Amortized Cost, Amortized cost, Past Due [Line Items]    
Gross loans held at amortized cost 2,412 2,778
Past due up to 30 days    
Loans Held At Amortized Cost, Amortized cost, Past Due [Line Items]    
Gross loans held at amortized cost 557 986
Past due 31 - 60 days    
Loans Held At Amortized Cost, Amortized cost, Past Due [Line Items]    
Gross loans held at amortized cost 167 184
Past due 61 - 90 days    
Loans Held At Amortized Cost, Amortized cost, Past Due [Line Items]    
Gross loans held at amortized cost 134 170
Past due more than 90 days    
Loans Held At Amortized Cost, Amortized cost, Past Due [Line Items]    
Gross loans held at amortized cost 1,554 1,438
Corporate and institutional    
Loans Held At Amortized Cost, Amortized cost, Past Due [Line Items]    
Total 116,155 117,685
Corporate and institutional | Financial Asset, Not Past Due [Member]    
Loans Held At Amortized Cost, Amortized cost, Past Due [Line Items]    
Gross loans held at amortized cost 115,014 115,986
Corporate and institutional | Financial Asset, Past Due [Member]    
Loans Held At Amortized Cost, Amortized cost, Past Due [Line Items]    
Gross loans held at amortized cost 1,141 1,699
Corporate and institutional | Past due up to 30 days    
Loans Held At Amortized Cost, Amortized cost, Past Due [Line Items]    
Gross loans held at amortized cost 248 757
Corporate and institutional | Past due 31 - 60 days    
Loans Held At Amortized Cost, Amortized cost, Past Due [Line Items]    
Gross loans held at amortized cost 24 48
Corporate and institutional | Past due 61 - 90 days    
Loans Held At Amortized Cost, Amortized cost, Past Due [Line Items]    
Gross loans held at amortized cost 13 89
Corporate and institutional | Past due more than 90 days    
Loans Held At Amortized Cost, Amortized cost, Past Due [Line Items]    
Gross loans held at amortized cost 856 805
Corporate and institutional | Real estate    
Loans Held At Amortized Cost, Amortized cost, Past Due [Line Items]    
Total 27,805 28,211
Corporate and institutional | Real estate | Financial Asset, Not Past Due [Member]    
Loans Held At Amortized Cost, Amortized cost, Past Due [Line Items]    
Gross loans held at amortized cost 27,628 28,070
Corporate and institutional | Real estate | Financial Asset, Past Due [Member]    
Loans Held At Amortized Cost, Amortized cost, Past Due [Line Items]    
Gross loans held at amortized cost 177 141
Corporate and institutional | Real estate | Past due up to 30 days    
Loans Held At Amortized Cost, Amortized cost, Past Due [Line Items]    
Gross loans held at amortized cost 6 50
Corporate and institutional | Real estate | Past due 31 - 60 days    
Loans Held At Amortized Cost, Amortized cost, Past Due [Line Items]    
Gross loans held at amortized cost 4 3
Corporate and institutional | Real estate | Past due 61 - 90 days    
Loans Held At Amortized Cost, Amortized cost, Past Due [Line Items]    
Gross loans held at amortized cost 0 11
Corporate and institutional | Real estate | Past due more than 90 days    
Loans Held At Amortized Cost, Amortized cost, Past Due [Line Items]    
Gross loans held at amortized cost 167 77
Corporate and institutional | Commercial and industrial loans    
Loans Held At Amortized Cost, Amortized cost, Past Due [Line Items]    
Total 66,147 70,563
Corporate and institutional | Commercial and industrial loans | Financial Asset, Not Past Due [Member]    
Loans Held At Amortized Cost, Amortized cost, Past Due [Line Items]    
Gross loans held at amortized cost 65,327 69,227
Corporate and institutional | Commercial and industrial loans | Financial Asset, Past Due [Member]    
Loans Held At Amortized Cost, Amortized cost, Past Due [Line Items]    
Gross loans held at amortized cost 820 1,336
Corporate and institutional | Commercial and industrial loans | Past due up to 30 days    
Loans Held At Amortized Cost, Amortized cost, Past Due [Line Items]    
Gross loans held at amortized cost 166 622
Corporate and institutional | Commercial and industrial loans | Past due 31 - 60 days    
Loans Held At Amortized Cost, Amortized cost, Past Due [Line Items]    
Gross loans held at amortized cost 13 26
Corporate and institutional | Commercial and industrial loans | Past due 61 - 90 days    
Loans Held At Amortized Cost, Amortized cost, Past Due [Line Items]    
Gross loans held at amortized cost 12 6
Corporate and institutional | Commercial and industrial loans | Past due more than 90 days    
Loans Held At Amortized Cost, Amortized cost, Past Due [Line Items]    
Gross loans held at amortized cost 629 682
Corporate and institutional | Financial institutions    
Loans Held At Amortized Cost, Amortized cost, Past Due [Line Items]    
Total 20,916 17,901
Corporate and institutional | Financial institutions | Financial Asset, Not Past Due [Member]    
Loans Held At Amortized Cost, Amortized cost, Past Due [Line Items]    
Gross loans held at amortized cost 20,807 17,720
Corporate and institutional | Financial institutions | Financial Asset, Past Due [Member]    
Loans Held At Amortized Cost, Amortized cost, Past Due [Line Items]    
Gross loans held at amortized cost 109 181
Corporate and institutional | Financial institutions | Past due up to 30 days    
Loans Held At Amortized Cost, Amortized cost, Past Due [Line Items]    
Gross loans held at amortized cost 60 48
Corporate and institutional | Financial institutions | Past due 31 - 60 days    
Loans Held At Amortized Cost, Amortized cost, Past Due [Line Items]    
Gross loans held at amortized cost 7 15
Corporate and institutional | Financial institutions | Past due 61 - 90 days    
Loans Held At Amortized Cost, Amortized cost, Past Due [Line Items]    
Gross loans held at amortized cost 1 72
Corporate and institutional | Financial institutions | Past due more than 90 days    
Loans Held At Amortized Cost, Amortized cost, Past Due [Line Items]    
Gross loans held at amortized cost 41 46
Corporate and institutional | Governments and public institutions    
Loans Held At Amortized Cost, Amortized cost, Past Due [Line Items]    
Total 1,287 1,010
Corporate and institutional | Governments and public institutions | Financial Asset, Not Past Due [Member]    
Loans Held At Amortized Cost, Amortized cost, Past Due [Line Items]    
Gross loans held at amortized cost 1,252 969
Corporate and institutional | Governments and public institutions | Financial Asset, Past Due [Member]    
Loans Held At Amortized Cost, Amortized cost, Past Due [Line Items]    
Gross loans held at amortized cost 35 41
Corporate and institutional | Governments and public institutions | Past due up to 30 days    
Loans Held At Amortized Cost, Amortized cost, Past Due [Line Items]    
Gross loans held at amortized cost 16 37
Corporate and institutional | Governments and public institutions | Past due 31 - 60 days    
Loans Held At Amortized Cost, Amortized cost, Past Due [Line Items]    
Gross loans held at amortized cost 0 4
Corporate and institutional | Governments and public institutions | Past due 61 - 90 days    
Loans Held At Amortized Cost, Amortized cost, Past Due [Line Items]    
Gross loans held at amortized cost 0 0
Corporate and institutional | Governments and public institutions | Past due more than 90 days    
Loans Held At Amortized Cost, Amortized cost, Past Due [Line Items]    
Gross loans held at amortized cost 19 0
Consumer    
Loans Held At Amortized Cost, Amortized cost, Past Due [Line Items]    
Total 166,666 164,446
Consumer | Financial Asset, Not Past Due [Member]    
Loans Held At Amortized Cost, Amortized cost, Past Due [Line Items]    
Gross loans held at amortized cost 165,395 163,367
Consumer | Financial Asset, Past Due [Member]    
Loans Held At Amortized Cost, Amortized cost, Past Due [Line Items]    
Gross loans held at amortized cost 1,271 1,079
Consumer | Past due up to 30 days    
Loans Held At Amortized Cost, Amortized cost, Past Due [Line Items]    
Gross loans held at amortized cost 309 229
Consumer | Past due 31 - 60 days    
Loans Held At Amortized Cost, Amortized cost, Past Due [Line Items]    
Gross loans held at amortized cost 143 136
Consumer | Past due 61 - 90 days    
Loans Held At Amortized Cost, Amortized cost, Past Due [Line Items]    
Gross loans held at amortized cost 121 81
Consumer | Past due more than 90 days    
Loans Held At Amortized Cost, Amortized cost, Past Due [Line Items]    
Gross loans held at amortized cost 698 633
Consumer | Mortgages    
Loans Held At Amortized Cost, Amortized cost, Past Due [Line Items]    
Total 110,533 109,067
Consumer | Mortgages | Financial Asset, Not Past Due [Member]    
Loans Held At Amortized Cost, Amortized cost, Past Due [Line Items]    
Gross loans held at amortized cost 109,877 108,544
Consumer | Mortgages | Financial Asset, Past Due [Member]    
Loans Held At Amortized Cost, Amortized cost, Past Due [Line Items]    
Gross loans held at amortized cost 656 523
Consumer | Mortgages | Past due up to 30 days    
Loans Held At Amortized Cost, Amortized cost, Past Due [Line Items]    
Gross loans held at amortized cost 123 63
Consumer | Mortgages | Past due 31 - 60 days    
Loans Held At Amortized Cost, Amortized cost, Past Due [Line Items]    
Gross loans held at amortized cost 73 68
Consumer | Mortgages | Past due 61 - 90 days    
Loans Held At Amortized Cost, Amortized cost, Past Due [Line Items]    
Gross loans held at amortized cost 61 34
Consumer | Mortgages | Past due more than 90 days    
Loans Held At Amortized Cost, Amortized cost, Past Due [Line Items]    
Gross loans held at amortized cost 399 358
Consumer | Loans collateralized by securities    
Loans Held At Amortized Cost, Amortized cost, Past Due [Line Items]    
Total 51,253 51,028
Consumer | Loans collateralized by securities | Financial Asset, Not Past Due [Member]    
Loans Held At Amortized Cost, Amortized cost, Past Due [Line Items]    
Gross loans held at amortized cost 51,069 50,907
Consumer | Loans collateralized by securities | Financial Asset, Past Due [Member]    
Loans Held At Amortized Cost, Amortized cost, Past Due [Line Items]    
Gross loans held at amortized cost 184 121
Consumer | Loans collateralized by securities | Past due up to 30 days    
Loans Held At Amortized Cost, Amortized cost, Past Due [Line Items]    
Gross loans held at amortized cost 42 17
Consumer | Loans collateralized by securities | Past due 31 - 60 days    
Loans Held At Amortized Cost, Amortized cost, Past Due [Line Items]    
Gross loans held at amortized cost 0 0
Consumer | Loans collateralized by securities | Past due 61 - 90 days    
Loans Held At Amortized Cost, Amortized cost, Past Due [Line Items]    
Gross loans held at amortized cost 0 0
Consumer | Loans collateralized by securities | Past due more than 90 days    
Loans Held At Amortized Cost, Amortized cost, Past Due [Line Items]    
Gross loans held at amortized cost 142 104
Consumer | Consumer finance    
Loans Held At Amortized Cost, Amortized cost, Past Due [Line Items]    
Total 4,880 4,351
Consumer | Consumer finance | Financial Asset, Not Past Due [Member]    
Loans Held At Amortized Cost, Amortized cost, Past Due [Line Items]    
Gross loans held at amortized cost 4,449 3,916
Consumer | Consumer finance | Financial Asset, Past Due [Member]    
Loans Held At Amortized Cost, Amortized cost, Past Due [Line Items]    
Gross loans held at amortized cost 431 435
Consumer | Consumer finance | Past due up to 30 days    
Loans Held At Amortized Cost, Amortized cost, Past Due [Line Items]    
Gross loans held at amortized cost 144 149
Consumer | Consumer finance | Past due 31 - 60 days    
Loans Held At Amortized Cost, Amortized cost, Past Due [Line Items]    
Gross loans held at amortized cost 70 68
Consumer | Consumer finance | Past due 61 - 90 days    
Loans Held At Amortized Cost, Amortized cost, Past Due [Line Items]    
Gross loans held at amortized cost 60 47
Consumer | Consumer finance | Past due more than 90 days    
Loans Held At Amortized Cost, Amortized cost, Past Due [Line Items]    
Gross loans held at amortized cost 157 171
Bank    
Loans Held At Amortized Cost, Amortized cost, Past Due [Line Items]    
Gross loans held at amortized cost 291,411 290,468
Total 291,492 290,563
Bank | Financial Asset, Not Past Due [Member]    
Loans Held At Amortized Cost, Amortized cost, Past Due [Line Items]    
Gross loans held at amortized cost 289,092 287,797
Bank | Financial Asset, Past Due [Member]    
Loans Held At Amortized Cost, Amortized cost, Past Due [Line Items]    
Gross loans held at amortized cost 2,400 2,766
Bank | Past due up to 30 days    
Loans Held At Amortized Cost, Amortized cost, Past Due [Line Items]    
Gross loans held at amortized cost 557 986
Bank | Past due 31 - 60 days    
Loans Held At Amortized Cost, Amortized cost, Past Due [Line Items]    
Gross loans held at amortized cost 167 184
Bank | Past due 61 - 90 days    
Loans Held At Amortized Cost, Amortized cost, Past Due [Line Items]    
Gross loans held at amortized cost 134 170
Bank | Past due more than 90 days    
Loans Held At Amortized Cost, Amortized cost, Past Due [Line Items]    
Gross loans held at amortized cost 1,542 1,426
Bank | Corporate and institutional    
Loans Held At Amortized Cost, Amortized cost, Past Due [Line Items]    
Total 116,143 117,673
Bank | Corporate and institutional | Financial Asset, Not Past Due [Member]    
Loans Held At Amortized Cost, Amortized cost, Past Due [Line Items]    
Gross loans held at amortized cost 115,014 115,986
Bank | Corporate and institutional | Financial Asset, Past Due [Member]    
Loans Held At Amortized Cost, Amortized cost, Past Due [Line Items]    
Gross loans held at amortized cost 1,129 1,687
Bank | Corporate and institutional | Past due up to 30 days    
Loans Held At Amortized Cost, Amortized cost, Past Due [Line Items]    
Gross loans held at amortized cost 248 757
Bank | Corporate and institutional | Past due 31 - 60 days    
Loans Held At Amortized Cost, Amortized cost, Past Due [Line Items]    
Gross loans held at amortized cost 24 48
Bank | Corporate and institutional | Past due 61 - 90 days    
Loans Held At Amortized Cost, Amortized cost, Past Due [Line Items]    
Gross loans held at amortized cost 13 89
Bank | Corporate and institutional | Past due more than 90 days    
Loans Held At Amortized Cost, Amortized cost, Past Due [Line Items]    
Gross loans held at amortized cost 844 793
Bank | Corporate and institutional | Real estate    
Loans Held At Amortized Cost, Amortized cost, Past Due [Line Items]    
Total 27,805 28,211
Bank | Corporate and institutional | Real estate | Financial Asset, Not Past Due [Member]    
Loans Held At Amortized Cost, Amortized cost, Past Due [Line Items]    
Gross loans held at amortized cost 27,628 28,070
Bank | Corporate and institutional | Real estate | Financial Asset, Past Due [Member]    
Loans Held At Amortized Cost, Amortized cost, Past Due [Line Items]    
Gross loans held at amortized cost 177 141
Bank | Corporate and institutional | Real estate | Past due up to 30 days    
Loans Held At Amortized Cost, Amortized cost, Past Due [Line Items]    
Gross loans held at amortized cost 6 50
Bank | Corporate and institutional | Real estate | Past due 31 - 60 days    
Loans Held At Amortized Cost, Amortized cost, Past Due [Line Items]    
Gross loans held at amortized cost 4 3
Bank | Corporate and institutional | Real estate | Past due 61 - 90 days    
Loans Held At Amortized Cost, Amortized cost, Past Due [Line Items]    
Gross loans held at amortized cost 0 11
Bank | Corporate and institutional | Real estate | Past due more than 90 days    
Loans Held At Amortized Cost, Amortized cost, Past Due [Line Items]    
Gross loans held at amortized cost 167 77
Bank | Corporate and institutional | Commercial and industrial loans    
Loans Held At Amortized Cost, Amortized cost, Past Due [Line Items]    
Total 66,135 70,551
Bank | Corporate and institutional | Commercial and industrial loans | Financial Asset, Not Past Due [Member]    
Loans Held At Amortized Cost, Amortized cost, Past Due [Line Items]    
Gross loans held at amortized cost 65,327 69,227
Bank | Corporate and institutional | Commercial and industrial loans | Financial Asset, Past Due [Member]    
Loans Held At Amortized Cost, Amortized cost, Past Due [Line Items]    
Gross loans held at amortized cost 808 1,324
Bank | Corporate and institutional | Commercial and industrial loans | Past due up to 30 days    
Loans Held At Amortized Cost, Amortized cost, Past Due [Line Items]    
Gross loans held at amortized cost 166 622
Bank | Corporate and institutional | Commercial and industrial loans | Past due 31 - 60 days    
Loans Held At Amortized Cost, Amortized cost, Past Due [Line Items]    
Gross loans held at amortized cost 13 26
Bank | Corporate and institutional | Commercial and industrial loans | Past due 61 - 90 days    
Loans Held At Amortized Cost, Amortized cost, Past Due [Line Items]    
Gross loans held at amortized cost 12 6
Bank | Corporate and institutional | Commercial and industrial loans | Past due more than 90 days    
Loans Held At Amortized Cost, Amortized cost, Past Due [Line Items]    
Gross loans held at amortized cost 617 670
Bank | Corporate and institutional | Financial institutions    
Loans Held At Amortized Cost, Amortized cost, Past Due [Line Items]    
Total 20,916 17,901
Bank | Corporate and institutional | Financial institutions | Financial Asset, Not Past Due [Member]    
Loans Held At Amortized Cost, Amortized cost, Past Due [Line Items]    
Gross loans held at amortized cost 20,807 17,720
Bank | Corporate and institutional | Financial institutions | Financial Asset, Past Due [Member]    
Loans Held At Amortized Cost, Amortized cost, Past Due [Line Items]    
Gross loans held at amortized cost 109 181
Bank | Corporate and institutional | Financial institutions | Past due up to 30 days    
Loans Held At Amortized Cost, Amortized cost, Past Due [Line Items]    
Gross loans held at amortized cost 60 48
Bank | Corporate and institutional | Financial institutions | Past due 31 - 60 days    
Loans Held At Amortized Cost, Amortized cost, Past Due [Line Items]    
Gross loans held at amortized cost 7 15
Bank | Corporate and institutional | Financial institutions | Past due 61 - 90 days    
Loans Held At Amortized Cost, Amortized cost, Past Due [Line Items]    
Gross loans held at amortized cost 1 72
Bank | Corporate and institutional | Financial institutions | Past due more than 90 days    
Loans Held At Amortized Cost, Amortized cost, Past Due [Line Items]    
Gross loans held at amortized cost 41 46
Bank | Corporate and institutional | Governments and public institutions    
Loans Held At Amortized Cost, Amortized cost, Past Due [Line Items]    
Total 1,287 1,010
Bank | Corporate and institutional | Governments and public institutions | Financial Asset, Not Past Due [Member]    
Loans Held At Amortized Cost, Amortized cost, Past Due [Line Items]    
Gross loans held at amortized cost 1,252 969
Bank | Corporate and institutional | Governments and public institutions | Financial Asset, Past Due [Member]    
Loans Held At Amortized Cost, Amortized cost, Past Due [Line Items]    
Gross loans held at amortized cost 35 41
Bank | Corporate and institutional | Governments and public institutions | Past due up to 30 days    
Loans Held At Amortized Cost, Amortized cost, Past Due [Line Items]    
Gross loans held at amortized cost 16 37
Bank | Corporate and institutional | Governments and public institutions | Past due 31 - 60 days    
Loans Held At Amortized Cost, Amortized cost, Past Due [Line Items]    
Gross loans held at amortized cost 0 4
Bank | Corporate and institutional | Governments and public institutions | Past due 61 - 90 days    
Loans Held At Amortized Cost, Amortized cost, Past Due [Line Items]    
Gross loans held at amortized cost 0 0
Bank | Corporate and institutional | Governments and public institutions | Past due more than 90 days    
Loans Held At Amortized Cost, Amortized cost, Past Due [Line Items]    
Gross loans held at amortized cost 19 0
Bank | Consumer    
Loans Held At Amortized Cost, Amortized cost, Past Due [Line Items]    
Total 166,666 164,446
Bank | Consumer | Financial Asset, Not Past Due [Member]    
Loans Held At Amortized Cost, Amortized cost, Past Due [Line Items]    
Gross loans held at amortized cost 165,395 163,367
Bank | Consumer | Financial Asset, Past Due [Member]    
Loans Held At Amortized Cost, Amortized cost, Past Due [Line Items]    
Gross loans held at amortized cost 1,271 1,079
Bank | Consumer | Past due up to 30 days    
Loans Held At Amortized Cost, Amortized cost, Past Due [Line Items]    
Gross loans held at amortized cost 309 229
Bank | Consumer | Past due 31 - 60 days    
Loans Held At Amortized Cost, Amortized cost, Past Due [Line Items]    
Gross loans held at amortized cost 143 136
Bank | Consumer | Past due 61 - 90 days    
Loans Held At Amortized Cost, Amortized cost, Past Due [Line Items]    
Gross loans held at amortized cost 121 81
Bank | Consumer | Past due more than 90 days    
Loans Held At Amortized Cost, Amortized cost, Past Due [Line Items]    
Gross loans held at amortized cost 698 633
Bank | Consumer | Mortgages    
Loans Held At Amortized Cost, Amortized cost, Past Due [Line Items]    
Total 110,533 109,067
Bank | Consumer | Mortgages | Financial Asset, Not Past Due [Member]    
Loans Held At Amortized Cost, Amortized cost, Past Due [Line Items]    
Gross loans held at amortized cost 109,877 108,544
Bank | Consumer | Mortgages | Financial Asset, Past Due [Member]    
Loans Held At Amortized Cost, Amortized cost, Past Due [Line Items]    
Gross loans held at amortized cost 656 523
Bank | Consumer | Mortgages | Past due up to 30 days    
Loans Held At Amortized Cost, Amortized cost, Past Due [Line Items]    
Gross loans held at amortized cost 123 63
Bank | Consumer | Mortgages | Past due 31 - 60 days    
Loans Held At Amortized Cost, Amortized cost, Past Due [Line Items]    
Gross loans held at amortized cost 73 68
Bank | Consumer | Mortgages | Past due 61 - 90 days    
Loans Held At Amortized Cost, Amortized cost, Past Due [Line Items]    
Gross loans held at amortized cost 61 34
Bank | Consumer | Mortgages | Past due more than 90 days    
Loans Held At Amortized Cost, Amortized cost, Past Due [Line Items]    
Gross loans held at amortized cost 399 358
Bank | Consumer | Loans collateralized by securities    
Loans Held At Amortized Cost, Amortized cost, Past Due [Line Items]    
Total 51,253 51,028
Bank | Consumer | Loans collateralized by securities | Financial Asset, Not Past Due [Member]    
Loans Held At Amortized Cost, Amortized cost, Past Due [Line Items]    
Gross loans held at amortized cost 51,069 50,907
Bank | Consumer | Loans collateralized by securities | Financial Asset, Past Due [Member]    
Loans Held At Amortized Cost, Amortized cost, Past Due [Line Items]    
Gross loans held at amortized cost 184 121
Bank | Consumer | Loans collateralized by securities | Past due up to 30 days    
Loans Held At Amortized Cost, Amortized cost, Past Due [Line Items]    
Gross loans held at amortized cost 42 17
Bank | Consumer | Loans collateralized by securities | Past due 31 - 60 days    
Loans Held At Amortized Cost, Amortized cost, Past Due [Line Items]    
Gross loans held at amortized cost 0 0
Bank | Consumer | Loans collateralized by securities | Past due 61 - 90 days    
Loans Held At Amortized Cost, Amortized cost, Past Due [Line Items]    
Gross loans held at amortized cost 0 0
Bank | Consumer | Loans collateralized by securities | Past due more than 90 days    
Loans Held At Amortized Cost, Amortized cost, Past Due [Line Items]    
Gross loans held at amortized cost 142 104
Bank | Consumer | Consumer finance    
Loans Held At Amortized Cost, Amortized cost, Past Due [Line Items]    
Total 4,880 4,351
Bank | Consumer | Consumer finance | Financial Asset, Not Past Due [Member]    
Loans Held At Amortized Cost, Amortized cost, Past Due [Line Items]    
Gross loans held at amortized cost 4,449 3,916
Bank | Consumer | Consumer finance | Financial Asset, Past Due [Member]    
Loans Held At Amortized Cost, Amortized cost, Past Due [Line Items]    
Gross loans held at amortized cost 431 435
Bank | Consumer | Consumer finance | Past due up to 30 days    
Loans Held At Amortized Cost, Amortized cost, Past Due [Line Items]    
Gross loans held at amortized cost 144 149
Bank | Consumer | Consumer finance | Past due 31 - 60 days    
Loans Held At Amortized Cost, Amortized cost, Past Due [Line Items]    
Gross loans held at amortized cost 70 68
Bank | Consumer | Consumer finance | Past due 61 - 90 days    
Loans Held At Amortized Cost, Amortized cost, Past Due [Line Items]    
Gross loans held at amortized cost 60 47
Bank | Consumer | Consumer finance | Past due more than 90 days    
Loans Held At Amortized Cost, Amortized cost, Past Due [Line Items]    
Gross loans held at amortized cost 157 171
Bank | Total loans to third parties    
Loans Held At Amortized Cost, Amortized cost, Past Due [Line Items]    
Total 282,809 282,119
Bank | Total loans to third parties | Financial Asset, Not Past Due [Member]    
Loans Held At Amortized Cost, Amortized cost, Past Due [Line Items]    
Gross loans held at amortized cost 280,409 279,353
Bank | Total loans to third parties | Financial Asset, Past Due [Member]    
Loans Held At Amortized Cost, Amortized cost, Past Due [Line Items]    
Gross loans held at amortized cost 2,400 2,766
Bank | Total loans to third parties | Past due up to 30 days    
Loans Held At Amortized Cost, Amortized cost, Past Due [Line Items]    
Gross loans held at amortized cost 557 986
Bank | Total loans to third parties | Past due 31 - 60 days    
Loans Held At Amortized Cost, Amortized cost, Past Due [Line Items]    
Gross loans held at amortized cost 167 184
Bank | Total loans to third parties | Past due 61 - 90 days    
Loans Held At Amortized Cost, Amortized cost, Past Due [Line Items]    
Gross loans held at amortized cost 134 170
Bank | Total loans to third parties | Past due more than 90 days    
Loans Held At Amortized Cost, Amortized cost, Past Due [Line Items]    
Gross loans held at amortized cost 1,542 1,426
Bank | Total loans to entities under common control    
Loans Held At Amortized Cost, Amortized cost, Past Due [Line Items]    
Total 8,683 8,444
Bank | Total loans to entities under common control | Financial Asset, Not Past Due [Member]    
Loans Held At Amortized Cost, Amortized cost, Past Due [Line Items]    
Gross loans held at amortized cost 8,683 8,444
Bank | Total loans to entities under common control | Financial Asset, Past Due [Member]    
Loans Held At Amortized Cost, Amortized cost, Past Due [Line Items]    
Gross loans held at amortized cost 0 0
Bank | Total loans to entities under common control | Past due up to 30 days    
Loans Held At Amortized Cost, Amortized cost, Past Due [Line Items]    
Gross loans held at amortized cost 0 0
Bank | Total loans to entities under common control | Past due 31 - 60 days    
Loans Held At Amortized Cost, Amortized cost, Past Due [Line Items]    
Gross loans held at amortized cost 0 0
Bank | Total loans to entities under common control | Past due 61 - 90 days    
Loans Held At Amortized Cost, Amortized cost, Past Due [Line Items]    
Gross loans held at amortized cost 0 0
Bank | Total loans to entities under common control | Past due more than 90 days    
Loans Held At Amortized Cost, Amortized cost, Past Due [Line Items]    
Gross loans held at amortized cost SFr 0 SFr 0