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FVM - Fair value hierarchy - Assets (Detail) - USD ($) $ in Millions | Jun. 30, 2023 | Mar. 31, 2023 | Dec. 31, 2022
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Disclosure Of Fair Value Measurement Of Assets [Line Items] |  |  |
Financial assets at fair value held for trading | $ 151,098 | $ 117,757 | $ 107,866
Derivative financial assets | 185,949 | 114,251 | 150,108
Brokerage receivables | 21,537 | 21,025 | 17,576
Financial assets at fair value not held for trading | 118,605 | 66,826 | 59,796
Financial assets measured at fair value through other comprehensive income | 2,217 | 2,241 | 2,239
Non-financial assets - Precious metals and other physical commodities | 5,794 | 4,506 | 4,471
Other non-financial assets measured at fair value | 90 | 109 | 110
Total assets measured at fair value | 485,291 | 326,714 | 342,166
Credit Suisse |  |  |
Disclosure Of Fair Value Measurement Of Assets [Line Items] |  |  |
Derivative financial assets | 63,200 |  |
Total assets measured at fair value | 151,301 |  |
Equity instruments |  |  |
Disclosure Of Fair Value Measurement Of Assets [Line Items] |  |  |
Financial assets at fair value held for trading | 98,329 | 88,194 | 83,988
Financial assets at fair value not held for trading | 3,348 | 949 | 849
Government bills / bonds |  |  |
Disclosure Of Fair Value Measurement Of Assets [Line Items] |  |  |
Financial assets at fair value held for trading | 25,518 | 10,460 | 6,464
Financial assets at fair value not held for trading | 20,120 | 20,965 | 16,741
Investment fund units |  |  |
Disclosure Of Fair Value Measurement Of Assets [Line Items] |  |  |
Financial assets at fair value held for trading | 7,043 | 7,733 | 7,330
Financial assets at fair value not held for trading | 1,519 | 1,081 | 1,063
Corporate and municipal bonds |  |  |
Disclosure Of Fair Value Measurement Of Assets [Line Items] |  |  |
Financial assets at fair value held for trading | 13,897 | 8,867 | 7,880
Financial assets at fair value not held for trading | 13,093 | 13,928 | 14,366
Financial assets measured at fair value through other comprehensive income | 282 | 293 | 335
Loans |  |  |
Disclosure Of Fair Value Measurement Of Assets [Line Items] |  |  |
Financial assets at fair value held for trading | 3,899 | 2,141 | 1,807
Financial assets at fair value not held for trading | 18,256 | 4,516 | 4,337
Asset-backed securities |  |  |
Disclosure Of Fair Value Measurement Of Assets [Line Items] |  |  |
Financial assets at fair value held for trading | 2,391 | 360 | 397
Foreign exchange |  |  |
Disclosure Of Fair Value Measurement Of Assets [Line Items] |  |  |
Derivative financial assets | 74,686 | 52,249 | 85,458
Interest rate contracts |  |  |
Disclosure Of Fair Value Measurement Of Assets [Line Items] |  |  |
Derivative financial assets | 63,711 | 36,737 | 39,805
Equity / index contracts |  |  |
Disclosure Of Fair Value Measurement Of Assets [Line Items] |  |  |
Derivative financial assets | 39,652 | 21,759 | 22,195
Credit derivative contracts |  |  |
Disclosure Of Fair Value Measurement Of Assets [Line Items] |  |  |
Derivative financial assets | 5,382 | 1,253 | 1,038
Commodity contracts |  |  |
Disclosure Of Fair Value Measurement Of Assets [Line Items] |  |  |
Derivative financial assets | 1,720 | 1,800 | 1,365
Auction rate securities |  |  |
Disclosure Of Fair Value Measurement Of Assets [Line Items] |  |  |
Financial assets at fair value not held for trading | 1,321 | 1,321 | 1,326
Securities financing transactions |  |  |
Disclosure Of Fair Value Measurement Of Assets [Line Items] |  |  |
Financial assets at fair value not held for trading | 43,907 | 9,779 | 7,704
Financial assets for unit-linked investment contracts |  |  |
Disclosure Of Fair Value Measurement Of Assets [Line Items] |  |  |
Financial assets at fair value not held for trading | 14,973 | 14,101 | 13,072
Commercial paper and certificates of deposit |  |  |
Disclosure Of Fair Value Measurement Of Assets [Line Items] |  |  |
Financial assets measured at fair value through other comprehensive income | 1,926 | 1,921 | 1,878
Level 1 |  |  |
Disclosure Of Fair Value Measurement Of Assets [Line Items] |  |  |
Financial assets at fair value held for trading | 117,863 | 104,793 | 96,241
Derivative financial assets | 1,072 | 879 | 769
Brokerage receivables | 0 | 0 | 0
Financial assets at fair value not held for trading | 31,358 | 32,279 | 26,572
Financial assets measured at fair value through other comprehensive income | 65 | 60 | 57
Non-financial assets - Precious metals and other physical commodities | 5,794 | 4,506 | 4,471
Other non-financial assets measured at fair value | 0 | 0 | 0
Total assets measured at fair value | 156,152 | 142,516 | 128,110
Level 1 | Credit Suisse |  |  |
Disclosure Of Fair Value Measurement Of Assets [Line Items] |  |  |
Total assets measured at fair value | 15,168 |  |
Level 1 | Equity instruments |  |  |
Disclosure Of Fair Value Measurement Of Assets [Line Items] |  |  |
Financial assets at fair value held for trading | 96,546 | 87,723 | 83,074
Financial assets at fair value not held for trading | 29 | 70 | 57
Level 1 | Government bills / bonds |  |  |
Disclosure Of Fair Value Measurement Of Assets [Line Items] |  |  |
Financial assets at fair value held for trading | 13,586 | 8,902 | 5,496
Financial assets at fair value not held for trading | 16,144 | 17,824 | 13,103
Level 1 | Investment fund units |  |  |
Disclosure Of Fair Value Measurement Of Assets [Line Items] |  |  |
Financial assets at fair value held for trading | 6,123 | 7,187 | 6,673
Financial assets at fair value not held for trading | 321 | 295 | 307
Level 1 | Corporate and municipal bonds |  |  |
Disclosure Of Fair Value Measurement Of Assets [Line Items] |  |  |
Financial assets at fair value held for trading | 1,592 | 977 | 976
Financial assets at fair value not held for trading | 61 | 86 | 35
Financial assets measured at fair value through other comprehensive income | 65 | 60 | 57
Level 1 | Loans |  |  |
Disclosure Of Fair Value Measurement Of Assets [Line Items] |  |  |
Financial assets at fair value held for trading | 0 | 0 | 0
Financial assets at fair value not held for trading | 0 | 0 | 0
Level 1 | Asset-backed securities |  |  |
Disclosure Of Fair Value Measurement Of Assets [Line Items] |  |  |
Financial assets at fair value held for trading | 15 | 4 | 22
Level 1 | Foreign exchange |  |  |
Disclosure Of Fair Value Measurement Of Assets [Line Items] |  |  |
Derivative financial assets | 576 | 515 | 575
Level 1 | Interest rate contracts |  |  |
Disclosure Of Fair Value Measurement Of Assets [Line Items] |  |  |
Derivative financial assets | 0 | 0 | 0
Level 1 | Equity / index contracts |  |  |
Disclosure Of Fair Value Measurement Of Assets [Line Items] |  |  |
Derivative financial assets | 1 | 1 | 1
Level 1 | Credit derivative contracts |  |  |
Disclosure Of Fair Value Measurement Of Assets [Line Items] |  |  |
Derivative financial assets | 0 | 0 | 0
Level 1 | Commodity contracts |  |  |
Disclosure Of Fair Value Measurement Of Assets [Line Items] |  |  |
Derivative financial assets | 7 | 0 | 0
Level 1 | Auction rate securities |  |  |
Disclosure Of Fair Value Measurement Of Assets [Line Items] |  |  |
Financial assets at fair value not held for trading | 0 | 0 | 0
Level 1 | Securities financing transactions |  |  |
Disclosure Of Fair Value Measurement Of Assets [Line Items] |  |  |
Financial assets at fair value not held for trading | 0 | 0 | 0
Level 1 | Financial assets for unit-linked investment contracts |  |  |
Disclosure Of Fair Value Measurement Of Assets [Line Items] |  |  |
Financial assets at fair value not held for trading | 14,802 | 14,004 | 13,071
Level 1 | Commercial paper and certificates of deposit |  |  |
Disclosure Of Fair Value Measurement Of Assets [Line Items] |  |  |
Financial assets measured at fair value through other comprehensive income | 0 | 0 | 0
Level 2 |  |  |
Disclosure Of Fair Value Measurement Of Assets [Line Items] |  |  |
Financial assets at fair value held for trading | 30,122 | 11,865 | 10,138
Derivative financial assets | 181,900 | 112,064 | 147,875
Brokerage receivables | 21,537 | 21,025 | 17,576
Financial assets at fair value not held for trading | 71,889 | 30,713 | 29,498
Financial assets measured at fair value through other comprehensive income | 2,152 | 2,181 | 2,182
Non-financial assets - Precious metals and other physical commodities | 0 | 0 | 0
Other non-financial assets measured at fair value | 1 | 0 | 0
Total assets measured at fair value | 307,601 | 177,847 | 207,269
Level 2 | Credit Suisse |  |  |
Disclosure Of Fair Value Measurement Of Assets [Line Items] |  |  |
Total assets measured at fair value | 121,363 |  |
Level 2 | Equity instruments |  |  |
Disclosure Of Fair Value Measurement Of Assets [Line Items] |  |  |
Financial assets at fair value held for trading | 1,330 | 295 | 789
Financial assets at fair value not held for trading | 227 | 0 | 0
Level 2 | Government bills / bonds |  |  |
Disclosure Of Fair Value Measurement Of Assets [Line Items] |  |  |
Financial assets at fair value held for trading | 11,865 | 1,534 | 950
Financial assets at fair value not held for trading | 3,976 | 3,140 | 3,638
Level 2 | Investment fund units |  |  |
Disclosure Of Fair Value Measurement Of Assets [Line Items] |  |  |
Financial assets at fair value held for trading | 773 | 536 | 596
Financial assets at fair value not held for trading | 516 | 498 | 566
Level 2 | Corporate and municipal bonds |  |  |
Disclosure Of Fair Value Measurement Of Assets [Line Items] |  |  |
Financial assets at fair value held for trading | 11,310 | 7,449 | 6,363
Financial assets at fair value not held for trading | 12,673 | 13,601 | 14,101
Financial assets measured at fair value through other comprehensive income | 217 | 233 | 278
Level 2 | Loans |  |  |
Disclosure Of Fair Value Measurement Of Assets [Line Items] |  |  |
Financial assets at fair value held for trading | 2,854 | 1,812 | 1,179
Financial assets at fair value not held for trading | 10,395 | 3,706 | 3,602
Level 2 | Asset-backed securities |  |  |
Disclosure Of Fair Value Measurement Of Assets [Line Items] |  |  |
Financial assets at fair value held for trading | 1,970 | 239 | 261
Level 2 | Foreign exchange |  |  |
Disclosure Of Fair Value Measurement Of Assets [Line Items] |  |  |
Derivative financial assets | 73,686 | 51,731 | 84,881
Level 2 | Interest rate contracts |  |  |
Disclosure Of Fair Value Measurement Of Assets [Line Items] |  |  |
Derivative financial assets | 62,950 | 36,339 | 39,345
Level 2 | Equity / index contracts |  |  |
Disclosure Of Fair Value Measurement Of Assets [Line Items] |  |  |
Derivative financial assets | 38,544 | 21,180 | 21,542
Level 2 | Credit derivative contracts |  |  |
Disclosure Of Fair Value Measurement Of Assets [Line Items] |  |  |
Derivative financial assets | 4,802 | 944 | 719
Level 2 | Commodity contracts |  |  |
Disclosure Of Fair Value Measurement Of Assets [Line Items] |  |  |
Derivative financial assets | 1,686 | 1,780 | 1,334
Level 2 | Auction rate securities |  |  |
Disclosure Of Fair Value Measurement Of Assets [Line Items] |  |  |
Financial assets at fair value not held for trading | 0 | 0 | 0
Level 2 | Securities financing transactions |  |  |
Disclosure Of Fair Value Measurement Of Assets [Line Items] |  |  |
Financial assets at fair value not held for trading | 43,798 | 9,670 | 7,590
Level 2 | Financial assets for unit-linked investment contracts |  |  |
Disclosure Of Fair Value Measurement Of Assets [Line Items] |  |  |
Financial assets at fair value not held for trading | 171 | 97 | 1
Level 2 | Commercial paper and certificates of deposit |  |  |
Disclosure Of Fair Value Measurement Of Assets [Line Items] |  |  |
Financial assets measured at fair value through other comprehensive income | 1,926 | 1,921 | 1,878
Level 3 |  |  |
Disclosure Of Fair Value Measurement Of Assets [Line Items] |  |  |
Financial assets at fair value held for trading | 3,113 | 1,099 | 1,488
Derivative financial assets | 2,978 | 1,309 | 1,464
Brokerage receivables | 0 | 0 | 0
Financial assets at fair value not held for trading | 15,358 | 3,834 | 3,725
Financial assets measured at fair value through other comprehensive income | 0 | 0 | 0
Non-financial assets - Precious metals and other physical commodities | 0 | 0 | 0
Other non-financial assets measured at fair value | 89 | 109 | 110
Total assets measured at fair value | 21,538 | 6,351 | 6,788
Level 3 | Credit Suisse |  |  |
Disclosure Of Fair Value Measurement Of Assets [Line Items] |  |  |
Total assets measured at fair value | 14,769 |  |
Level 3 | Equity instruments |  |  |
Disclosure Of Fair Value Measurement Of Assets [Line Items] |  |  |
Financial assets at fair value held for trading | 454 | 177 | 126
Financial assets at fair value not held for trading | 3,092 | 879 | 792
Level 3 | Government bills / bonds |  |  |
Disclosure Of Fair Value Measurement Of Assets [Line Items] |  |  |
Financial assets at fair value held for trading | 67 | 23 | 18
Financial assets at fair value not held for trading | 0 | 0 | 0
Level 3 | Investment fund units |  |  |
Disclosure Of Fair Value Measurement Of Assets [Line Items] |  |  |
Financial assets at fair value held for trading | 146 | 10 | 61
Financial assets at fair value not held for trading | 683 | 288 | 190
Level 3 | Corporate and municipal bonds |  |  |
Disclosure Of Fair Value Measurement Of Assets [Line Items] |  |  |
Financial assets at fair value held for trading | 995 | 442 | 541
Financial assets at fair value not held for trading | 359 | 241 | 230
Financial assets measured at fair value through other comprehensive income | 0 | 0 | 0
Level 3 | Loans |  |  |
Disclosure Of Fair Value Measurement Of Assets [Line Items] |  |  |
Financial assets at fair value held for trading | 1,045 | 329 | 628
Financial assets at fair value not held for trading | 7,861 | 810 | 736
Level 3 | Asset-backed securities |  |  |
Disclosure Of Fair Value Measurement Of Assets [Line Items] |  |  |
Financial assets at fair value held for trading | 406 | 118 | 114
Level 3 | Foreign exchange |  |  |
Disclosure Of Fair Value Measurement Of Assets [Line Items] |  |  |
Derivative financial assets | 425 | 3 | 2
Level 3 | Interest rate contracts |  |  |
Disclosure Of Fair Value Measurement Of Assets [Line Items] |  |  |
Derivative financial assets | 761 | 398 | 460
Level 3 | Equity / index contracts |  |  |
Disclosure Of Fair Value Measurement Of Assets [Line Items] |  |  |
Derivative financial assets | 1,108 | 578 | 653
Level 3 | Credit derivative contracts |  |  |
Disclosure Of Fair Value Measurement Of Assets [Line Items] |  |  |
Derivative financial assets | 580 | 309 | 318
Level 3 | Commodity contracts |  |  |
Disclosure Of Fair Value Measurement Of Assets [Line Items] |  |  |
Derivative financial assets | 28 | 20 | 30
Level 3 | Auction rate securities |  |  |
Disclosure Of Fair Value Measurement Of Assets [Line Items] |  |  |
Financial assets at fair value not held for trading | 1,321 | 1,321 | 1,326
Level 3 | Securities financing transactions |  |  |
Disclosure Of Fair Value Measurement Of Assets [Line Items] |  |  |
Financial assets at fair value not held for trading | 109 | 108 | 114
Level 3 | Financial assets for unit-linked investment contracts |  |  |
Disclosure Of Fair Value Measurement Of Assets [Line Items] |  |  |
Financial assets at fair value not held for trading | 0 | 0 | 0
Level 3 | Commercial paper and certificates of deposit |  |  |
Disclosure Of Fair Value Measurement Of Assets [Line Items] |  |  |
Financial assets measured at fair value through other comprehensive income | $ 0 | $ 0 | $ 0

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