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CECL (Details 7) - CHF (SFr) SFr in Millions | Dec. 31, 2023 | Dec. 31, 2022
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Loans Held At Amortized Cost, Amortized cost, Past Due [Line Items] |  |
Gross loans held at amortized cost | SFr 215,963 | SFr 262,108
Total | 215,997 | 262,179
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 | 213,257 | 259,302
Financial Asset, Past Due [Member] |  |
Loans Held At Amortized Cost, Amortized cost, Past Due [Line Items] |  |
Gross loans held at amortized cost | 2,740 | 2,877
Past due up to 30 days |  |
Loans Held At Amortized Cost, Amortized cost, Past Due [Line Items] |  |
Gross loans held at amortized cost | 717 | 789
Past due 31 - 60 days |  |
Loans Held At Amortized Cost, Amortized cost, Past Due [Line Items] |  |
Gross loans held at amortized cost | 382 | 220
Past due 61 - 90 days |  |
Loans Held At Amortized Cost, Amortized cost, Past Due [Line Items] |  |
Gross loans held at amortized cost | 126 | 98
Past due more than 90 days |  |
Loans Held At Amortized Cost, Amortized cost, Past Due [Line Items] |  |
Gross loans held at amortized cost | 1,515 | 1,770
Corporate and institutional |  |
Loans Held At Amortized Cost, Amortized cost, Past Due [Line Items] |  |
Total | 82,169 | 107,421
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 | 80,749 | 105,864
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 | 1,420 | 1,557
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 | 362 | 432
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 | 260 | 91
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 | 53 | 24
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 | 745 | 1,010
Corporate and institutional | Real estate |  |
Loans Held At Amortized Cost, Amortized cost, Past Due [Line Items] |  |
Total | 21,101 | 25,157
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 | 20,705 | 24,946
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 | 396 | 211
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 | 36 | 35
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 | 28 | 49
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 | 0
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 | 332 | 127
Corporate and institutional | Commercial and industrial loans |  |
Loans Held At Amortized Cost, Amortized cost, Past Due [Line Items] |  |
Total | 46,519 | 59,366
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 | 45,677 | 58,267
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 | 842 | 1,099
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 | 192 | 320
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 | 225 | 42
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 | 16 | 24
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 | 409 | 713
Corporate and institutional | Financial institutions |  |
Loans Held At Amortized Cost, Amortized cost, Past Due [Line Items] |  |
Total | 13,519 | 21,711
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 | 13,347 | 21,480
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 | 172 | 231
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 | 126 | 72
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 | 0
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 | 37 | 0
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 | 2 | 159
Corporate and institutional | Governments and public institutions |  |
Loans Held At Amortized Cost, Amortized cost, Past Due [Line Items] |  |
Total | 1,030 | 1,187
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 | 1,020 | 1,171
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 | 10 | 16
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 | 8 | 5
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 | 0
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 | 2 | 11
Consumer |  |
Loans Held At Amortized Cost, Amortized cost, Past Due [Line Items] |  |
Total | 132,577 | 150,808
Consumer | Financial Asset, Not Past Due [Member] |  |
Loans Held At Amortized Cost, Amortized cost, Past Due [Line Items] |  |
Gross loans held at amortized cost | 131,257 | 149,488
Consumer | Financial Asset, Past Due [Member] |  |
Loans Held At Amortized Cost, Amortized cost, Past Due [Line Items] |  |
Gross loans held at amortized cost | 1,320 | 1,320
Consumer | Past due up to 30 days |  |
Loans Held At Amortized Cost, Amortized cost, Past Due [Line Items] |  |
Gross loans held at amortized cost | 355 | 357
Consumer | Past due 31 - 60 days |  |
Loans Held At Amortized Cost, Amortized cost, Past Due [Line Items] |  |
Gross loans held at amortized cost | 122 | 129
Consumer | Past due 61 - 90 days |  |
Loans Held At Amortized Cost, Amortized cost, Past Due [Line Items] |  |
Gross loans held at amortized cost | 73 | 74
Consumer | Past due more than 90 days |  |
Loans Held At Amortized Cost, Amortized cost, Past Due [Line Items] |  |
Gross loans held at amortized cost | 770 | 760
Consumer | Mortgages |  |
Loans Held At Amortized Cost, Amortized cost, Past Due [Line Items] |  |
Total | 100,606 | 107,484
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 | 100,160 | 107,033
Consumer | Mortgages | Financial Asset, Past Due [Member] |  |
Loans Held At Amortized Cost, Amortized cost, Past Due [Line Items] |  |
Gross loans held at amortized cost | 446 | 451
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 | 86 | 66
Consumer | Mortgages | Past due 31 - 60 days |  |
Loans Held At Amortized Cost, Amortized cost, Past Due [Line Items] |  |
Gross loans held at amortized cost | 42 | 43
Consumer | Mortgages | Past due 61 - 90 days |  |
Loans Held At Amortized Cost, Amortized cost, Past Due [Line Items] |  |
Gross loans held at amortized cost | 10 | 8
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 | 308 | 334
Consumer | Loans collateralized by securities |  |
Loans Held At Amortized Cost, Amortized cost, Past Due [Line Items] |  |
Total | 26,380 | 37,639
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 | 26,089 | 37,308
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 | 291 | 331
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 | 1 | 43
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 | 4
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 | 3
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 | 290 | 281
Consumer | Consumer finance |  |
Loans Held At Amortized Cost, Amortized cost, Past Due [Line Items] |  |
Total | 5,591 | 5,685
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 | 5,008 | 5,147
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 | 583 | 538
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 | 268 | 248
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 | 80 | 82
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 | 63 | 63
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 | 172 | 145
Total loans to third parties |  |
Loans Held At Amortized Cost, Amortized cost, Past Due [Line Items] |  |
Total | 214,746 | 258,229
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 | 212,006 | 255,352
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 | 2,740 | 2,877
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 | 717 | 789
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 | 382 | 220
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 | 126 | 98
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 | 1,515 | 1,770
Total loans to entities under common control |  |
Loans Held At Amortized Cost, Amortized cost, Past Due [Line Items] |  |
Total | 1,251 | 3,950
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 | 1,251 | 3,950
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
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
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
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
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

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