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Expected credit loss measurement - Off-balance sheet financial assets subject to ECL (Detail) - USD ($) $ in Millions | Jun. 30, 2023 | Mar. 31, 2023 | Dec. 31, 2022
--- | --- | --- | ---
Disclosure Of Provision Matrix [Line Items] |  |  |
Total off-balance sheet financial instruments and other credit lines | $ 340,634 | $ 112,425 | $ 112,050
Total ECL provisions | (367) | (214) | (201)
Total allowance and provisions | (1,868) | (1,121) | (1,091)
Credit Suisse |  |  |
Disclosure Of Provision Matrix [Line Items] |  |  |
Total off-balance sheet financial instruments and other credit lines | 225,021 |  |
Total allowance and provisions | (731) |  |
Guarantees |  |  |
Disclosure Of Provision Matrix [Line Items] |  |  |
Total off-balance sheet financial instruments and other credit lines | 38,463 | 22,670 | 22,167
Total ECL provisions | (66) | (54) | (48)
Guarantees | Large corporate clients |  |  |
Disclosure Of Provision Matrix [Line Items] |  |  |
Total off-balance sheet financial instruments and other credit lines | 8,358 | 3,476 | 3,663
Total ECL provisions | (19) | (19) | (26)
Guarantees | SME clients |  |  |
Disclosure Of Provision Matrix [Line Items] |  |  |
Total off-balance sheet financial instruments and other credit lines | 4,170 | 1,368 | 1,337
Total ECL provisions | (20) | (11) | (5)
Guarantees | Financial intermediaries and hedge funds |  |  |
Disclosure Of Provision Matrix [Line Items] |  |  |
Total off-balance sheet financial instruments and other credit lines | 12,874 | 13,076 | 11,833
Total ECL provisions | (11) | (11) | (12)
Guarantees | Lombard |  |  |
Disclosure Of Provision Matrix [Line Items] |  |  |
Total off-balance sheet financial instruments and other credit lines | 4,752 | 2,171 | 2,376
Total ECL provisions | (1) | (1) | (1)
Guarantees | Commodity trade finance |  |  |
Disclosure Of Provision Matrix [Line Items] |  |  |
Total off-balance sheet financial instruments and other credit lines | 2,200 | 1,815 | 2,121
Total ECL provisions | (1) | (1) | (1)
Irrevocable loan commitments |  |  |
Disclosure Of Provision Matrix [Line Items] |  |  |
Total off-balance sheet financial instruments and other credit lines | 124,281 | 39,775 | 39,996
Total ECL provisions | (225) | (113) | (111)
Irrevocable loan commitments | Large corporate clients |  |  |
Disclosure Of Provision Matrix [Line Items] |  |  |
Total off-balance sheet financial instruments and other credit lines | 77,160 | 23,294 | 23,611
Total ECL provisions | (198) | (95) | (93)
Forward starting reverse repurchase and securities borrowing agreements |  |  |
Disclosure Of Provision Matrix [Line Items] |  |  |
Total off-balance sheet financial instruments and other credit lines | 4,972 | 4,748 | 3,801
Total ECL provisions | 0 | 0 | 0
Unconditionally revocable loan commitments |  |  |
Disclosure Of Provision Matrix [Line Items] |  |  |
Total off-balance sheet financial instruments and other credit lines | 168,556 | 41,071 | 41,390
Total ECL provisions | (74) | (44) | (40)
Unconditionally revocable loan commitments | Real estate financing |  |  |
Disclosure Of Provision Matrix [Line Items] |  |  |
Total off-balance sheet financial instruments and other credit lines | 17,107 | 8,226 | 8,711
Total ECL provisions | (12) | (6) | (6)
Unconditionally revocable loan commitments | Large corporate clients |  |  |
Disclosure Of Provision Matrix [Line Items] |  |  |
Total off-balance sheet financial instruments and other credit lines | 4,790 | 4,496 | 4,578
Total ECL provisions | (6) | (5) | (4)
Unconditionally revocable loan commitments | SME clients |  |  |
Disclosure Of Provision Matrix [Line Items] |  |  |
Total off-balance sheet financial instruments and other credit lines | 24,601 | 4,898 | 4,723
Total ECL provisions | (42) | (21) | (19)
Unconditionally revocable loan commitments | Lombard |  |  |
Disclosure Of Provision Matrix [Line Items] |  |  |
Total off-balance sheet financial instruments and other credit lines | 82,491 | 8,166 | 7,855
Total ECL provisions | 0 | 0 | 0
Unconditionally revocable loan commitments | Credit cards |  |  |
Disclosure Of Provision Matrix [Line Items] |  |  |
Total off-balance sheet financial instruments and other credit lines | 9,762 | 9,567 | 9,390
Total ECL provisions | (7) | (7) | (7)
Unconditionally revocable loan commitments | Commodity trade finance |  |  |
Disclosure Of Provision Matrix [Line Items] |  |  |
Total off-balance sheet financial instruments and other credit lines |  | 370 | 327
Total ECL provisions |  | 0 | 0
Irrevocable committed prolongation of existing loans |  |  |
Disclosure Of Provision Matrix [Line Items] |  |  |
Total off-balance sheet financial instruments and other credit lines | 4,362 | 4,161 | 4,696
Total ECL provisions | (3) | (3) | (2)
Stages 1 and 2 |  |  |
Disclosure Of Provision Matrix [Line Items] |  |  |
Total allowance and provisions | 1,199 |  |
Twelve-month expected credit losses | Stages 1 and 2 |  |  |
Disclosure Of Provision Matrix [Line Items] |  |  |
Total off-balance sheet financial instruments and other credit lines | 335,213 | 107,112 | 105,258
Total ECL provisions | (293) | (108) | (106)
Total allowance and provisions | (955) | (284) | (259)
Twelve-month expected credit losses | Stages 1 and 2 | Credit Suisse |  |  |
Disclosure Of Provision Matrix [Line Items] |  |  |
Total off-balance sheet financial instruments and other credit lines | 224,604 |  |
Total allowance and provisions | (648) |  |
Twelve-month expected credit losses | Stages 1 and 2 | Guarantees |  |  |
Disclosure Of Provision Matrix [Line Items] |  |  |
Total off-balance sheet financial instruments and other credit lines | 37,345 | 21,670 | 19,805
Total ECL provisions | (40) | (13) | (13)
Twelve-month expected credit losses | Stages 1 and 2 | Guarantees | Large corporate clients |  |  |
Disclosure Of Provision Matrix [Line Items] |  |  |
Total off-balance sheet financial instruments and other credit lines | 7,553 | 2,733 | 2,883
Total ECL provisions | (16) | (2) | (2)
Twelve-month expected credit losses | Stages 1 and 2 | Guarantees | SME clients |  |  |
Disclosure Of Provision Matrix [Line Items] |  |  |
Total off-balance sheet financial instruments and other credit lines | 3,928 | 1,197 | 1,124
Total ECL provisions | (10) | (1) | (1)
Twelve-month expected credit losses | Stages 1 and 2 | Guarantees | Financial intermediaries and hedge funds |  |  |
Disclosure Of Provision Matrix [Line Items] |  |  |
Total off-balance sheet financial instruments and other credit lines | 12,859 | 13,037 | 10,513
Total ECL provisions | (8) | (8) | (8)
Twelve-month expected credit losses | Stages 1 and 2 | Guarantees | Lombard |  |  |
Disclosure Of Provision Matrix [Line Items] |  |  |
Total off-balance sheet financial instruments and other credit lines | 4,752 | 2,170 | 2,376
Total ECL provisions | 0 | 0 | 0
Twelve-month expected credit losses | Stages 1 and 2 | Guarantees | Commodity trade finance |  |  |
Disclosure Of Provision Matrix [Line Items] |  |  |
Total off-balance sheet financial instruments and other credit lines | 2,200 | 1,815 | 2,121
Total ECL provisions | (1) | (1) | (1)
Twelve-month expected credit losses | Stages 1 and 2 | Irrevocable loan commitments |  |  |
Disclosure Of Provision Matrix [Line Items] |  |  |
Total off-balance sheet financial instruments and other credit lines | 121,789 | 37,261 | 37,531
Total ECL provisions | (186) | (57) | (59)
Twelve-month expected credit losses | Stages 1 and 2 | Irrevocable loan commitments | Large corporate clients |  |  |
Disclosure Of Provision Matrix [Line Items] |  |  |
Total off-balance sheet financial instruments and other credit lines | 75,044 | 21,263 | 21,488
Total ECL provisions | (165) | (47) | (49)
Twelve-month expected credit losses | Stages 1 and 2 | Forward starting reverse repurchase and securities borrowing agreements |  |  |
Disclosure Of Provision Matrix [Line Items] |  |  |
Total off-balance sheet financial instruments and other credit lines | 4,972 | 4,748 | 3,801
Total ECL provisions | 0 | 0 | 0
Twelve-month expected credit losses | Stages 1 and 2 | Unconditionally revocable loan commitments |  |  |
Disclosure Of Provision Matrix [Line Items] |  |  |
Total off-balance sheet financial instruments and other credit lines | 166,754 | 39,307 | 39,521
Total ECL provisions | (65) | (36) | (32)
Twelve-month expected credit losses | Stages 1 and 2 | Unconditionally revocable loan commitments | Real estate financing |  |  |
Disclosure Of Provision Matrix [Line Items] |  |  |
Total off-balance sheet financial instruments and other credit lines | 16,850 | 8,037 | 8,528
Total ECL provisions | (12) | (6) | (6)
Twelve-month expected credit losses | Stages 1 and 2 | Unconditionally revocable loan commitments | Large corporate clients |  |  |
Disclosure Of Provision Matrix [Line Items] |  |  |
Total off-balance sheet financial instruments and other credit lines | 4,624 | 4,284 | 4,304
Total ECL provisions | (3) | (3) | (1)
Twelve-month expected credit losses | Stages 1 and 2 | Unconditionally revocable loan commitments | SME clients |  |  |
Disclosure Of Provision Matrix [Line Items] |  |  |
Total off-balance sheet financial instruments and other credit lines | 24,381 | 4,656 | 4,442
Total ECL provisions | (39) | (18) | (16)
Twelve-month expected credit losses | Stages 1 and 2 | Unconditionally revocable loan commitments | Lombard |  |  |
Disclosure Of Provision Matrix [Line Items] |  |  |
Total off-balance sheet financial instruments and other credit lines | 82,491 | 8,165 | 7,854
Total ECL provisions | 0 | 0 | 0
Twelve-month expected credit losses | Stages 1 and 2 | Unconditionally revocable loan commitments | Credit cards |  |  |
Disclosure Of Provision Matrix [Line Items] |  |  |
Total off-balance sheet financial instruments and other credit lines | 9,274 | 9,078 | 8,900
Total ECL provisions | (6) | (5) | (5)
Twelve-month expected credit losses | Stages 1 and 2 | Unconditionally revocable loan commitments | Commodity trade finance |  |  |
Disclosure Of Provision Matrix [Line Items] |  |  |
Total off-balance sheet financial instruments and other credit lines |  | 370 | 327
Total ECL provisions |  | 0 | 0
Twelve-month expected credit losses | Stages 1 and 2 | Irrevocable committed prolongation of existing loans |  |  |
Disclosure Of Provision Matrix [Line Items] |  |  |
Total off-balance sheet financial instruments and other credit lines | 4,353 | 4,126 | 4,600
Total ECL provisions | (2) | (3) | (2)
Lifetime expected credit losses | Stages 1 and 2 |  |  |
Disclosure Of Provision Matrix [Line Items] |  |  |
Total off-balance sheet financial instruments and other credit lines | 4,743 | 5,044 | 6,522
Total ECL provisions | (54) | (72) | (69)
Total allowance and provisions | (244) | (271) | (267)
Lifetime expected credit losses | Stages 1 and 2 | Credit Suisse |  |  |
Disclosure Of Provision Matrix [Line Items] |  |  |
Total off-balance sheet financial instruments and other credit lines | 0 |  |
Total allowance and provisions | 0 |  |
Lifetime expected credit losses | Stages 1 and 2 | Guarantees |  |  |
Disclosure Of Provision Matrix [Line Items] |  |  |
Total off-balance sheet financial instruments and other credit lines | 921 | 887 | 2,254
Total ECL provisions | (7) | (8) | (9)
Lifetime expected credit losses | Stages 1 and 2 | Guarantees | Large corporate clients |  |  |
Disclosure Of Provision Matrix [Line Items] |  |  |
Total off-balance sheet financial instruments and other credit lines | 690 | 668 | 721
Total ECL provisions | (2) | (3) | (3)
Lifetime expected credit losses | Stages 1 and 2 | Guarantees | SME clients |  |  |
Disclosure Of Provision Matrix [Line Items] |  |  |
Total off-balance sheet financial instruments and other credit lines | 167 | 133 | 164
Total ECL provisions | (1) | (1) | (1)
Lifetime expected credit losses | Stages 1 and 2 | Guarantees | Financial intermediaries and hedge funds |  |  |
Disclosure Of Provision Matrix [Line Items] |  |  |
Total off-balance sheet financial instruments and other credit lines | 15 | 38 | 1,320
Total ECL provisions | (3) | (4) | (4)
Lifetime expected credit losses | Stages 1 and 2 | Guarantees | Lombard |  |  |
Disclosure Of Provision Matrix [Line Items] |  |  |
Total off-balance sheet financial instruments and other credit lines | 0 | 0 | 0
Total ECL provisions | 0 | 0 | 0
Lifetime expected credit losses | Stages 1 and 2 | Guarantees | Commodity trade finance |  |  |
Disclosure Of Provision Matrix [Line Items] |  |  |
Total off-balance sheet financial instruments and other credit lines | 0 | 0 | 0
Total ECL provisions | 0 | 0 | 0
Lifetime expected credit losses | Stages 1 and 2 | Irrevocable loan commitments |  |  |
Disclosure Of Provision Matrix [Line Items] |  |  |
Total off-balance sheet financial instruments and other credit lines | 2,076 | 2,400 | 2,341
Total ECL provisions | (38) | (56) | (52)
Lifetime expected credit losses | Stages 1 and 2 | Irrevocable loan commitments | Large corporate clients |  |  |
Disclosure Of Provision Matrix [Line Items] |  |  |
Total off-balance sheet financial instruments and other credit lines | 1,731 | 1,948 | 2,024
Total ECL provisions | (31) | (49) | (45)
Lifetime expected credit losses | Stages 1 and 2 | Forward starting reverse repurchase and securities borrowing agreements |  |  |
Disclosure Of Provision Matrix [Line Items] |  |  |
Total off-balance sheet financial instruments and other credit lines | 0 | 0 | 0
Total ECL provisions | 0 | 0 | 0
Lifetime expected credit losses | Stages 1 and 2 | Unconditionally revocable loan commitments |  |  |
Disclosure Of Provision Matrix [Line Items] |  |  |
Total off-balance sheet financial instruments and other credit lines | 1,739 | 1,724 | 1,833
Total ECL provisions | (9) | (8) | (8)
Lifetime expected credit losses | Stages 1 and 2 | Unconditionally revocable loan commitments | Real estate financing |  |  |
Disclosure Of Provision Matrix [Line Items] |  |  |
Total off-balance sheet financial instruments and other credit lines | 258 | 188 | 183
Total ECL provisions | 0 | 0 | 0
Lifetime expected credit losses | Stages 1 and 2 | Unconditionally revocable loan commitments | Large corporate clients |  |  |
Disclosure Of Provision Matrix [Line Items] |  |  |
Total off-balance sheet financial instruments and other credit lines | 158 | 205 | 268
Total ECL provisions | (3) | (2) | (2)
Lifetime expected credit losses | Stages 1 and 2 | Unconditionally revocable loan commitments | SME clients |  |  |
Disclosure Of Provision Matrix [Line Items] |  |  |
Total off-balance sheet financial instruments and other credit lines | 179 | 214 | 256
Total ECL provisions | (3) | (3) | (3)
Lifetime expected credit losses | Stages 1 and 2 | Unconditionally revocable loan commitments | Lombard |  |  |
Disclosure Of Provision Matrix [Line Items] |  |  |
Total off-balance sheet financial instruments and other credit lines | 0 | 0 | 0
Total ECL provisions | 0 | 0 | 0
Lifetime expected credit losses | Stages 1 and 2 | Unconditionally revocable loan commitments | Credit cards |  |  |
Disclosure Of Provision Matrix [Line Items] |  |  |
Total off-balance sheet financial instruments and other credit lines | 484 | 486 | 487
Total ECL provisions | (2) | (2) | (2)
Lifetime expected credit losses | Stages 1 and 2 | Unconditionally revocable loan commitments | Commodity trade finance |  |  |
Disclosure Of Provision Matrix [Line Items] |  |  |
Total off-balance sheet financial instruments and other credit lines |  | 0 | 0
Total ECL provisions |  | 0 | 0
Lifetime expected credit losses | Stages 1 and 2 | Irrevocable committed prolongation of existing loans |  |  |
Disclosure Of Provision Matrix [Line Items] |  |  |
Total off-balance sheet financial instruments and other credit lines | 7 | 33 | 94
Total ECL provisions | 0 | 0 | 0
Lifetime expected credit losses | Stage 3 |  |  |
Disclosure Of Provision Matrix [Line Items] |  |  |
Total off-balance sheet financial instruments and other credit lines | 261 | 269 | 270
Total ECL provisions | (19) | (33) | (26)
Total allowance and provisions | (637) | (567) | (564)
Lifetime expected credit losses | Stage 3 | Credit Suisse |  |  |
Disclosure Of Provision Matrix [Line Items] |  |  |
Total off-balance sheet financial instruments and other credit lines | 0 |  |
Total allowance and provisions | (52) |  |
Lifetime expected credit losses | Stage 3 | Guarantees |  |  |
Disclosure Of Provision Matrix [Line Items] |  |  |
Total off-balance sheet financial instruments and other credit lines | 118 | 113 | 108
Total ECL provisions | (17) | (33) | (26)
Lifetime expected credit losses | Stage 3 | Guarantees | Large corporate clients |  |  |
Disclosure Of Provision Matrix [Line Items] |  |  |
Total off-balance sheet financial instruments and other credit lines | 79 | 75 | 58
Total ECL provisions | 0 | (14) | (21)
Lifetime expected credit losses | Stage 3 | Guarantees | SME clients |  |  |
Disclosure Of Provision Matrix [Line Items] |  |  |
Total off-balance sheet financial instruments and other credit lines | 38 | 38 | 49
Total ECL provisions | (9) | (9) | (3)
Lifetime expected credit losses | Stage 3 | Guarantees | Financial intermediaries and hedge funds |  |  |
Disclosure Of Provision Matrix [Line Items] |  |  |
Total off-balance sheet financial instruments and other credit lines | 0 | 0 | 0
Total ECL provisions | 0 | 0 | 0
Lifetime expected credit losses | Stage 3 | Guarantees | Lombard |  |  |
Disclosure Of Provision Matrix [Line Items] |  |  |
Total off-balance sheet financial instruments and other credit lines | 1 | 1 | 1
Total ECL provisions | (1) | (1) | (1)
Lifetime expected credit losses | Stage 3 | Guarantees | Commodity trade finance |  |  |
Disclosure Of Provision Matrix [Line Items] |  |  |
Total off-balance sheet financial instruments and other credit lines | 0 | 0 | 0
Total ECL provisions | 0 | 0 | 0
Lifetime expected credit losses | Stage 3 | Irrevocable loan commitments |  |  |
Disclosure Of Provision Matrix [Line Items] |  |  |
Total off-balance sheet financial instruments and other credit lines | 78 | 114 | 124
Total ECL provisions | (2) | 0 | 0
Lifetime expected credit losses | Stage 3 | Irrevocable loan commitments | Large corporate clients |  |  |
Disclosure Of Provision Matrix [Line Items] |  |  |
Total off-balance sheet financial instruments and other credit lines | 52 | 83 | 99
Total ECL provisions | (2) | 0 | 0
Lifetime expected credit losses | Stage 3 | Forward starting reverse repurchase and securities borrowing agreements |  |  |
Disclosure Of Provision Matrix [Line Items] |  |  |
Total off-balance sheet financial instruments and other credit lines | 0 | 0 | 0
Total ECL provisions | 0 | 0 | 0
Lifetime expected credit losses | Stage 3 | Unconditionally revocable loan commitments |  |  |
Disclosure Of Provision Matrix [Line Items] |  |  |
Total off-balance sheet financial instruments and other credit lines | 63 | 40 | 36
Total ECL provisions | 0 | 0 | 0
Lifetime expected credit losses | Stage 3 | Unconditionally revocable loan commitments | Real estate financing |  |  |
Disclosure Of Provision Matrix [Line Items] |  |  |
Total off-balance sheet financial instruments and other credit lines | 0 | 0 | 0
Total ECL provisions | 0 | 0 | 0
Lifetime expected credit losses | Stage 3 | Unconditionally revocable loan commitments | Large corporate clients |  |  |
Disclosure Of Provision Matrix [Line Items] |  |  |
Total off-balance sheet financial instruments and other credit lines | 7 | 7 | 5
Total ECL provisions | 0 | 0 | 0
Lifetime expected credit losses | Stage 3 | Unconditionally revocable loan commitments | SME clients |  |  |
Disclosure Of Provision Matrix [Line Items] |  |  |
Total off-balance sheet financial instruments and other credit lines | 40 | 28 | 26
Total ECL provisions | 0 | 0 | 0
Lifetime expected credit losses | Stage 3 | Unconditionally revocable loan commitments | Lombard |  |  |
Disclosure Of Provision Matrix [Line Items] |  |  |
Total off-balance sheet financial instruments and other credit lines | 1 | 1 | 1
Total ECL provisions | 0 | 0 | 0
Lifetime expected credit losses | Stage 3 | Unconditionally revocable loan commitments | Credit cards |  |  |
Disclosure Of Provision Matrix [Line Items] |  |  |
Total off-balance sheet financial instruments and other credit lines | 4 | 3 | 3
Total ECL provisions | 0 | 0 | 0
Lifetime expected credit losses | Stage 3 | Unconditionally revocable loan commitments | Commodity trade finance |  |  |
Disclosure Of Provision Matrix [Line Items] |  |  |
Total off-balance sheet financial instruments and other credit lines |  | 0 | 0
Total ECL provisions |  | 0 | 0
Lifetime expected credit losses | Stage 3 | Irrevocable committed prolongation of existing loans |  |  |
Disclosure Of Provision Matrix [Line Items] |  |  |
Total off-balance sheet financial instruments and other credit lines | 2 | 2 | 2
Total ECL provisions | 0 | $ 0 | $ 0
Lifetime expected credit losses | Purchased credit-impaired (PCI) |  |  |
Disclosure Of Provision Matrix [Line Items] |  |  |
Total off-balance sheet financial instruments and other credit lines | 417 |  |
Total ECL provisions | (1) |  |
Total allowance and provisions | (32) |  |
Lifetime expected credit losses | Purchased credit-impaired (PCI) | Credit Suisse |  |  |
Disclosure Of Provision Matrix [Line Items] |  |  |
Total off-balance sheet financial instruments and other credit lines | 417 |  |
Total allowance and provisions | (32) |  |
Lifetime expected credit losses | Purchased credit-impaired (PCI) | Guarantees |  |  |
Disclosure Of Provision Matrix [Line Items] |  |  |
Total off-balance sheet financial instruments and other credit lines | 79 |  |
Total ECL provisions | (1) |  |
Lifetime expected credit losses | Purchased credit-impaired (PCI) | Guarantees | Large corporate clients |  |  |
Disclosure Of Provision Matrix [Line Items] |  |  |
Total off-balance sheet financial instruments and other credit lines | 36 |  |
Total ECL provisions | 0 |  |
Lifetime expected credit losses | Purchased credit-impaired (PCI) | Guarantees | SME clients |  |  |
Disclosure Of Provision Matrix [Line Items] |  |  |
Total off-balance sheet financial instruments and other credit lines | 37 |  |
Total ECL provisions | 2 |  |
Lifetime expected credit losses | Purchased credit-impaired (PCI) | Guarantees | Financial intermediaries and hedge funds |  |  |
Disclosure Of Provision Matrix [Line Items] |  |  |
Total off-balance sheet financial instruments and other credit lines | 0 |  |
Total ECL provisions | 0 |  |
Lifetime expected credit losses | Purchased credit-impaired (PCI) | Guarantees | Lombard |  |  |
Disclosure Of Provision Matrix [Line Items] |  |  |
Total off-balance sheet financial instruments and other credit lines | 0 |  |
Total ECL provisions | 0 |  |
Lifetime expected credit losses | Purchased credit-impaired (PCI) | Guarantees | Commodity trade finance |  |  |
Disclosure Of Provision Matrix [Line Items] |  |  |
Total off-balance sheet financial instruments and other credit lines | 0 |  |
Total ECL provisions | 0 |  |
Lifetime expected credit losses | Purchased credit-impaired (PCI) | Irrevocable loan commitments |  |  |
Disclosure Of Provision Matrix [Line Items] |  |  |
Total off-balance sheet financial instruments and other credit lines | 338 |  |
Total ECL provisions | 0 |  |
Lifetime expected credit losses | Purchased credit-impaired (PCI) | Irrevocable loan commitments | Large corporate clients |  |  |
Disclosure Of Provision Matrix [Line Items] |  |  |
Total off-balance sheet financial instruments and other credit lines | 333 |  |
Total ECL provisions | 0 |  |
Lifetime expected credit losses | Purchased credit-impaired (PCI) | Forward starting reverse repurchase and securities borrowing agreements |  |  |
Disclosure Of Provision Matrix [Line Items] |  |  |
Total off-balance sheet financial instruments and other credit lines | 0 |  |
Total ECL provisions | 0 |  |
Lifetime expected credit losses | Purchased credit-impaired (PCI) | Unconditionally revocable loan commitments |  |  |
Disclosure Of Provision Matrix [Line Items] |  |  |
Total off-balance sheet financial instruments and other credit lines | 0 |  |
Total ECL provisions | 0 |  |
Lifetime expected credit losses | Purchased credit-impaired (PCI) | Unconditionally revocable loan commitments | Real estate financing |  |  |
Disclosure Of Provision Matrix [Line Items] |  |  |
Total off-balance sheet financial instruments and other credit lines | 0 |  |
Total ECL provisions | 0 |  |
Lifetime expected credit losses | Purchased credit-impaired (PCI) | Unconditionally revocable loan commitments | Large corporate clients |  |  |
Disclosure Of Provision Matrix [Line Items] |  |  |
Total off-balance sheet financial instruments and other credit lines | 0 |  |
Total ECL provisions | 0 |  |
Lifetime expected credit losses | Purchased credit-impaired (PCI) | Unconditionally revocable loan commitments | SME clients |  |  |
Disclosure Of Provision Matrix [Line Items] |  |  |
Total off-balance sheet financial instruments and other credit lines | 0 |  |
Total ECL provisions | 0 |  |
Lifetime expected credit losses | Purchased credit-impaired (PCI) | Unconditionally revocable loan commitments | Lombard |  |  |
Disclosure Of Provision Matrix [Line Items] |  |  |
Total off-balance sheet financial instruments and other credit lines | 0 |  |
Total ECL provisions | 0 |  |
Lifetime expected credit losses | Purchased credit-impaired (PCI) | Unconditionally revocable loan commitments | Credit cards |  |  |
Disclosure Of Provision Matrix [Line Items] |  |  |
Total off-balance sheet financial instruments and other credit lines | 0 |  |
Total ECL provisions | 0 |  |
Lifetime expected credit losses | Purchased credit-impaired (PCI) | Irrevocable committed prolongation of existing loans |  |  |
Disclosure Of Provision Matrix [Line Items] |  |  |
Total off-balance sheet financial instruments and other credit lines | 0 |  |
Total ECL provisions | $ 0 |  |

X
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- References No definition available. + Details
Name: | ubs_AllowanceForCreditLossesOnFinancialAssetsAndProvisionsForExpectedCreditLossesOnLoanCommitmentsAndFinancialGuaranteeContracts
Namespace Prefix: | ubs_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The amount of the provisions for expected credit losses on loan commitments and financial guarantee contracts. + References No definition available. + Details
Name: | ubs_ProvisionsForExpectedCreditLossesOnLoanCommitmentsAndFinancialGuaranteeContracts
Namespace Prefix: | ubs_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Details
Name: | srt_ConsolidatedEntitiesAxis=ubs_CreditSuisseMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | ifrs-full_ClassesOfFinancialInstrumentsAxis=ifrs-full_FinancialGuaranteeContractsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | ifrs-full_CounterpartiesAxis=ifrs-full_CorporateLoansMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | ifrs-full_CounterpartiesAxis=ubs_SmallMediumEnterpriseMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | ifrs-full_CounterpartiesAxis=ubs_FinancialIntermediariesAndHedgeFundsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | ifrs-full_CounterpartiesAxis=ubs_LombardLoanMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | ifrs-full_CounterpartiesAxis=ubs_CommodityTradeFinanceMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | ifrs-full_ClassesOfFinancialInstrumentsAxis=ifrs-full_LoanCommitmentsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | ifrs-full_ClassesOfFinancialInstrumentsAxis=ubs_ForwardStartingTransactionsReverseRepurchaseAndSecuritiesBorrowingAgreementsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | ifrs-full_ClassesOfFinancialInstrumentsAxis=ubs_CommittedRevocableCreditLinesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | ifrs-full_CounterpartiesAxis=ubs_RealEstateLoanMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | ifrs-full_CounterpartiesAxis=ubs_CreditCardMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | ifrs-full_ClassesOfFinancialInstrumentsAxis=ubs_IrrevocableCommittedProlongationOfLoansMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | ifrs-full_CreditImpairmentOfFinancialInstrumentsAxis=ifrs-full_FinancialInstrumentsNotCreditimpairedMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | ifrs-full_TypeOfMeasurementOfExpectedCreditLossesAxis=ifrs-full_TwelvemonthExpectedCreditLossesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | ifrs-full_TypeOfMeasurementOfExpectedCreditLossesAxis=ifrs-full_LifetimeExpectedCreditLossesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | ifrs-full_CreditImpairmentOfFinancialInstrumentsAxis=ifrs-full_FinancialInstrumentsCreditimpairedMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | ifrs-full_CreditImpairmentOfFinancialInstrumentsAxis=ifrs-full_FinancialInstrumentsPurchasedOrOriginatedCreditimpairedMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |