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FVM - Fair value hierarchy - Liabilities (Detail) - USD ($) $ in Millions | Jun. 30, 2021 | Mar. 31, 2021 | Dec. 31, 2020
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Disclosure Of Fair Value Measurement Of Liabilities [Line Items] |  |  |  |
Financial liabilities measured at fair value |  | $ 299,869 | $ 324,088 | $ 325,069
Measured at fair value on a recurring basis | Financial liabilities at fair value held for trading |  |  |  |
Disclosure Of Fair Value Measurement Of Liabilities [Line Items] |  |  |  |
Financial liabilities measured at fair value |  | 33,348 | 37,062 | 33,595
Measured at fair value on a recurring basis | Financial liabilities at fair value held for trading | Equity instruments |  |  |  |
Disclosure Of Fair Value Measurement Of Liabilities [Line Items] |  |  |  |
Financial liabilities measured at fair value |  | 21,288 | 26,392 | 22,985
Measured at fair value on a recurring basis | Financial liabilities at fair value held for trading | Corporate and municipal bonds |  |  |  |
Disclosure Of Fair Value Measurement Of Liabilities [Line Items] |  |  |  |
Financial liabilities measured at fair value |  | 4,642 | 4,757 | 4,089
Measured at fair value on a recurring basis | Financial liabilities at fair value held for trading | Government bills / bonds |  |  |  |
Disclosure Of Fair Value Measurement Of Liabilities [Line Items] |  |  |  |
Financial liabilities measured at fair value |  | 6,347 | 4,975 | 4,678
Measured at fair value on a recurring basis | Financial liabilities at fair value held for trading | Investment fund units |  |  |  |
Disclosure Of Fair Value Measurement Of Liabilities [Line Items] |  |  |  |
Financial liabilities measured at fair value |  | 1,028 | 891 | 1,828
Measured at fair value on a recurring basis | Derivative financial instruments |  |  |  |
Disclosure Of Fair Value Measurement Of Liabilities [Line Items] |  |  |  |
Financial liabilities measured at fair value |  | 121,686 | 146,036 | 161,102
Measured at fair value on a recurring basis | Derivative financial instruments | Foreign exchange contracts |  |  |  |
Disclosure Of Fair Value Measurement Of Liabilities [Line Items] |  |  |  |
Financial liabilities measured at fair value |  | 47,387 | 67,638 | 70,527
Measured at fair value on a recurring basis | Derivative financial instruments | Interest rate contracts |  |  |  |
Disclosure Of Fair Value Measurement Of Liabilities [Line Items] |  |  |  |
Financial liabilities measured at fair value |  | 32,703 | 34,046 | 43,916
Measured at fair value on a recurring basis | Derivative financial instruments | Equity / index contracts |  |  |  |
Disclosure Of Fair Value Measurement Of Liabilities [Line Items] |  |  |  |
Financial liabilities measured at fair value |  | 36,342 | 38,684 | 41,176
Measured at fair value on a recurring basis | Derivative financial instruments | Credit derivative contracts |  |  |  |
Disclosure Of Fair Value Measurement Of Liabilities [Line Items] |  |  |  |
Financial liabilities measured at fair value |  | 2,392 | 2,508 | 2,931
Measured at fair value on a recurring basis | Derivative financial instruments | Commodity contracts |  |  |  |
Disclosure Of Fair Value Measurement Of Liabilities [Line Items] |  |  |  |
Financial liabilities measured at fair value |  | 2,085 | 1,966 | 2,027
Measured at fair value on a recurring basis | Brokerage payables designated at fair value |  |  |  |
Disclosure Of Fair Value Measurement Of Liabilities [Line Items] |  |  |  |
Financial liabilities measured at fair value |  | 39,129 | 45,600 | 38,742
Measured at fair value on a recurring basis | Debt issued designated at fair value |  |  |  |
Disclosure Of Fair Value Measurement Of Liabilities [Line Items] |  |  |  |
Financial liabilities measured at fair value |  | 75,065 | 66,535 | 61,243
Measured at fair value on a recurring basis | Other financial liabilities designated at fair value |  |  |  |
Disclosure Of Fair Value Measurement Of Liabilities [Line Items] |  |  |  |
Financial liabilities measured at fair value |  | 30,642 | 28,855 | 30,387
Measured at fair value on a recurring basis | Other financial liabilities designated at fair value | Financial liabilities related to unit-linked investment contracts |  |  |  |
Disclosure Of Fair Value Measurement Of Liabilities [Line Items] |  |  |  |
Financial liabilities measured at fair value |  | 22,217 | 21,357 | 20,975
Measured at fair value on a recurring basis | Other financial liabilities designated at fair value | Securities financing transactions |  |  |  |
Disclosure Of Fair Value Measurement Of Liabilities [Line Items] |  |  |  |
Financial liabilities measured at fair value |  | 6,184 | 5,651 | 7,317
Measured at fair value on a recurring basis | Other financial liabilities designated at fair value | Over-the-counter debt instruments |  |  |  |
Disclosure Of Fair Value Measurement Of Liabilities [Line Items] |  |  |  |
Financial liabilities measured at fair value |  | 2,142 | 1,787 | 2,060
Level 1 |  |  |  |
Disclosure Of Fair Value Measurement Of Liabilities [Line Items] |  |  |  |
Financial liabilities measured at fair value |  | 27,791 | 32,291 | 27,635
Level 1 | Measured at fair value on a recurring basis | Financial liabilities at fair value held for trading |  |  |  |
Disclosure Of Fair Value Measurement Of Liabilities [Line Items] |  |  |  |
Financial liabilities measured at fair value |  | 27,038 | 30,887 | 26,888
Level 1 | Measured at fair value on a recurring basis | Financial liabilities at fair value held for trading | Equity instruments |  |  |  |
Disclosure Of Fair Value Measurement Of Liabilities [Line Items] |  |  |  |
Financial liabilities measured at fair value |  | 20,826 | 26,190 | 22,519
Level 1 | Measured at fair value on a recurring basis | Financial liabilities at fair value held for trading | Corporate and municipal bonds |  |  |  |
Disclosure Of Fair Value Measurement Of Liabilities [Line Items] |  |  |  |
Financial liabilities measured at fair value |  | 37 | 32 | 31
Level 1 | Measured at fair value on a recurring basis | Financial liabilities at fair value held for trading | Government bills / bonds |  |  |  |
Disclosure Of Fair Value Measurement Of Liabilities [Line Items] |  |  |  |
Financial liabilities measured at fair value |  | 5,727 | 4,168 | 3,642
Level 1 | Measured at fair value on a recurring basis | Financial liabilities at fair value held for trading | Investment fund units |  |  |  |
Disclosure Of Fair Value Measurement Of Liabilities [Line Items] |  |  |  |
Financial liabilities measured at fair value |  | 442 | 492 | 696
Level 1 | Measured at fair value on a recurring basis | Derivative financial instruments |  |  |  |
Disclosure Of Fair Value Measurement Of Liabilities [Line Items] |  |  |  |
Financial liabilities measured at fair value |  | 754 | 1,404 | 746
Level 1 | Measured at fair value on a recurring basis | Derivative financial instruments | Foreign exchange contracts |  |  |  |
Disclosure Of Fair Value Measurement Of Liabilities [Line Items] |  |  |  |
Financial liabilities measured at fair value |  | 280 | 541 | 316
Level 1 | Measured at fair value on a recurring basis | Derivative financial instruments | Interest rate contracts |  |  |  |
Disclosure Of Fair Value Measurement Of Liabilities [Line Items] |  |  |  |
Financial liabilities measured at fair value |  | 0 | 0 | 0
Level 1 | Measured at fair value on a recurring basis | Derivative financial instruments | Equity / index contracts |  |  |  |
Disclosure Of Fair Value Measurement Of Liabilities [Line Items] |  |  |  |
Financial liabilities measured at fair value |  | 9 | 0 | 0
Level 1 | Measured at fair value on a recurring basis | Derivative financial instruments | Credit derivative contracts |  |  |  |
Disclosure Of Fair Value Measurement Of Liabilities [Line Items] |  |  |  |
Financial liabilities measured at fair value |  | 0 | 0 | 0
Level 1 | Measured at fair value on a recurring basis | Derivative financial instruments | Commodity contracts |  |  |  |
Disclosure Of Fair Value Measurement Of Liabilities [Line Items] |  |  |  |
Financial liabilities measured at fair value |  | 0 | 0 | 0
Level 1 | Measured at fair value on a recurring basis | Brokerage payables designated at fair value |  |  |  |
Disclosure Of Fair Value Measurement Of Liabilities [Line Items] |  |  |  |
Financial liabilities measured at fair value |  | 0 | 0 | 0
Level 1 | Measured at fair value on a recurring basis | Debt issued designated at fair value |  |  |  |
Disclosure Of Fair Value Measurement Of Liabilities [Line Items] |  |  |  |
Financial liabilities measured at fair value |  | 0 | 0 | 0
Level 1 | Measured at fair value on a recurring basis | Other financial liabilities designated at fair value |  |  |  |
Disclosure Of Fair Value Measurement Of Liabilities [Line Items] |  |  |  |
Financial liabilities measured at fair value |  | 0 | 0 | 0
Level 1 | Measured at fair value on a recurring basis | Other financial liabilities designated at fair value | Financial liabilities related to unit-linked investment contracts |  |  |  |
Disclosure Of Fair Value Measurement Of Liabilities [Line Items] |  |  |  |
Financial liabilities measured at fair value |  | 0 | 0 | 0
Level 1 | Measured at fair value on a recurring basis | Other financial liabilities designated at fair value | Securities financing transactions |  |  |  |
Disclosure Of Fair Value Measurement Of Liabilities [Line Items] |  |  |  |
Financial liabilities measured at fair value |  | 0 | 0 | 0
Level 1 | Measured at fair value on a recurring basis | Other financial liabilities designated at fair value | Over-the-counter debt instruments |  |  |  |
Disclosure Of Fair Value Measurement Of Liabilities [Line Items] |  |  |  |
Financial liabilities measured at fair value |  | 0 | 0 | 0
Level 2 |  |  |  |
Disclosure Of Fair Value Measurement Of Liabilities [Line Items] |  |  |  |
Financial liabilities measured at fair value |  | 253,679 | 275,442 | 282,222
Level 2 | Measured at fair value on a recurring basis | Financial liabilities at fair value held for trading |  |  |  |
Disclosure Of Fair Value Measurement Of Liabilities [Line Items] |  |  |  |
Financial liabilities measured at fair value |  | 6,216 | 6,114 | 6,652
Level 2 | Measured at fair value on a recurring basis | Financial liabilities at fair value held for trading | Equity instruments |  |  |  |
Disclosure Of Fair Value Measurement Of Liabilities [Line Items] |  |  |  |
Financial liabilities measured at fair value |  | 387 | 151 | 425
Level 2 | Measured at fair value on a recurring basis | Financial liabilities at fair value held for trading | Corporate and municipal bonds |  |  |  |
Disclosure Of Fair Value Measurement Of Liabilities [Line Items] |  |  |  |
Financial liabilities measured at fair value |  | 4,592 | 4,718 | 4,048
Level 2 | Measured at fair value on a recurring basis | Financial liabilities at fair value held for trading | Government bills / bonds |  |  |  |
Disclosure Of Fair Value Measurement Of Liabilities [Line Items] |  |  |  |
Financial liabilities measured at fair value |  | 620 | 807 | 1,036
Level 2 | Measured at fair value on a recurring basis | Financial liabilities at fair value held for trading | Investment fund units |  |  |  |
Disclosure Of Fair Value Measurement Of Liabilities [Line Items] |  |  |  |
Financial liabilities measured at fair value |  | 581 | 397 | 1,127
Level 2 | Measured at fair value on a recurring basis | Derivative financial instruments |  |  |  |
Disclosure Of Fair Value Measurement Of Liabilities [Line Items] |  |  |  |
Financial liabilities measured at fair value |  | 117,983 | 141,518 | 156,884
Level 2 | Measured at fair value on a recurring basis | Derivative financial instruments | Foreign exchange contracts |  |  |  |
Disclosure Of Fair Value Measurement Of Liabilities [Line Items] |  |  |  |
Financial liabilities measured at fair value |  | 47,048 | 67,043 | 70,149
Level 2 | Measured at fair value on a recurring basis | Derivative financial instruments | Interest rate contracts |  |  |  |
Disclosure Of Fair Value Measurement Of Liabilities [Line Items] |  |  |  |
Financial liabilities measured at fair value |  | 32,177 | 33,501 | 43,389
Level 2 | Measured at fair value on a recurring basis | Derivative financial instruments | Equity / index contracts |  |  |  |
Disclosure Of Fair Value Measurement Of Liabilities [Line Items] |  |  |  |
Financial liabilities measured at fair value |  | 34,431 | 36,614 | 38,870
Level 2 | Measured at fair value on a recurring basis | Derivative financial instruments | Credit derivative contracts |  |  |  |
Disclosure Of Fair Value Measurement Of Liabilities [Line Items] |  |  |  |
Financial liabilities measured at fair value |  | 2,000 | 2,139 | 2,403
Level 2 | Measured at fair value on a recurring basis | Derivative financial instruments | Commodity contracts |  |  |  |
Disclosure Of Fair Value Measurement Of Liabilities [Line Items] |  |  |  |
Financial liabilities measured at fair value |  | 2,034 | 1,907 | 2,003
Level 2 | Measured at fair value on a recurring basis | Brokerage payables designated at fair value |  |  |  |
Disclosure Of Fair Value Measurement Of Liabilities [Line Items] |  |  |  |
Financial liabilities measured at fair value |  | 39,129 | 45,600 | 38,742
Level 2 | Measured at fair value on a recurring basis | Debt issued designated at fair value |  |  |  |
Disclosure Of Fair Value Measurement Of Liabilities [Line Items] |  |  |  |
Financial liabilities measured at fair value |  | 60,321 | 53,900 | 50,273
Level 2 | Measured at fair value on a recurring basis | Other financial liabilities designated at fair value |  |  |  |
Disclosure Of Fair Value Measurement Of Liabilities [Line Items] |  |  |  |
Financial liabilities measured at fair value |  | 30,032 | 28,310 | 29,671
Level 2 | Measured at fair value on a recurring basis | Other financial liabilities designated at fair value | Financial liabilities related to unit-linked investment contracts |  |  |  |
Disclosure Of Fair Value Measurement Of Liabilities [Line Items] |  |  |  |
Financial liabilities measured at fair value |  | 22,217 | 21,357 | 20,975
Level 2 | Measured at fair value on a recurring basis | Other financial liabilities designated at fair value | Securities financing transactions |  |  |  |
Disclosure Of Fair Value Measurement Of Liabilities [Line Items] |  |  |  |
Financial liabilities measured at fair value |  | 6,181 | 5,651 | 7,317
Level 2 | Measured at fair value on a recurring basis | Other financial liabilities designated at fair value | Over-the-counter debt instruments |  |  |  |
Disclosure Of Fair Value Measurement Of Liabilities [Line Items] |  |  |  |
Financial liabilities measured at fair value |  | 1,550 | 1,261 | 1,363
Level 3 |  |  |  |
Disclosure Of Fair Value Measurement Of Liabilities [Line Items] |  |  |  |
Financial liabilities measured at fair value |  | 18,398 | 16,355 | 15,212
Level 3 | Equity instruments |  |  |  |
Disclosure Of Fair Value Measurement Of Liabilities [Line Items] |  |  |  |
Financial liabilities measured at fair value | [1] | 100 |  | 0
Level 3 | Corporate and municipal bonds |  |  |  |
Disclosure Of Fair Value Measurement Of Liabilities [Line Items] |  |  |  |
Financial liabilities measured at fair value |  | 0 |  | 0
Level 3 | Investment fund units |  |  |  |
Disclosure Of Fair Value Measurement Of Liabilities [Line Items] |  |  |  |
Financial liabilities measured at fair value | [1] | 0 |  | 0
Level 3 | Measured at fair value on a recurring basis | Financial liabilities at fair value held for trading |  |  |  |
Disclosure Of Fair Value Measurement Of Liabilities [Line Items] |  |  |  |
Financial liabilities measured at fair value |  | 94 | 61 | 55
Level 3 | Measured at fair value on a recurring basis | Financial liabilities at fair value held for trading | Equity instruments |  |  |  |
Disclosure Of Fair Value Measurement Of Liabilities [Line Items] |  |  |  |
Financial liabilities measured at fair value |  | 75 | 50 | 40
Level 3 | Measured at fair value on a recurring basis | Financial liabilities at fair value held for trading | Corporate and municipal bonds |  |  |  |
Disclosure Of Fair Value Measurement Of Liabilities [Line Items] |  |  |  |
Financial liabilities measured at fair value |  | 13 | 7 | 9
Level 3 | Measured at fair value on a recurring basis | Financial liabilities at fair value held for trading | Government bills / bonds |  |  |  |
Disclosure Of Fair Value Measurement Of Liabilities [Line Items] |  |  |  |
Financial liabilities measured at fair value |  | 0 | 0 | 0
Level 3 | Measured at fair value on a recurring basis | Financial liabilities at fair value held for trading | Investment fund units |  |  |  |
Disclosure Of Fair Value Measurement Of Liabilities [Line Items] |  |  |  |
Financial liabilities measured at fair value |  | 6 | 3 | 5
Level 3 | Measured at fair value on a recurring basis | Derivative financial instruments |  |  |  |
Disclosure Of Fair Value Measurement Of Liabilities [Line Items] |  |  |  |
Financial liabilities measured at fair value |  | 2,950 | 3,114 | 3,471
Level 3 | Measured at fair value on a recurring basis | Derivative financial instruments | Foreign exchange contracts |  |  |  |
Disclosure Of Fair Value Measurement Of Liabilities [Line Items] |  |  |  |
Financial liabilities measured at fair value |  | 59 | 54 | 61
Level 3 | Measured at fair value on a recurring basis | Derivative financial instruments | Interest rate contracts |  |  |  |
Disclosure Of Fair Value Measurement Of Liabilities [Line Items] |  |  |  |
Financial liabilities measured at fair value |  | 526 | 546 | 527
Level 3 | Measured at fair value on a recurring basis | Derivative financial instruments | Equity / index contracts |  |  |  |
Disclosure Of Fair Value Measurement Of Liabilities [Line Items] |  |  |  |
Financial liabilities measured at fair value |  | 1,902 | 2,070 | 2,306
Level 3 | Measured at fair value on a recurring basis | Derivative financial instruments | Credit derivative contracts |  |  |  |
Disclosure Of Fair Value Measurement Of Liabilities [Line Items] |  |  |  |
Financial liabilities measured at fair value |  | 392 | 369 | 528
Level 3 | Measured at fair value on a recurring basis | Derivative financial instruments | Commodity contracts |  |  |  |
Disclosure Of Fair Value Measurement Of Liabilities [Line Items] |  |  |  |
Financial liabilities measured at fair value |  | 51 | 59 | 24
Level 3 | Measured at fair value on a recurring basis | Brokerage payables designated at fair value |  |  |  |
Disclosure Of Fair Value Measurement Of Liabilities [Line Items] |  |  |  |
Financial liabilities measured at fair value |  | 0 | 0 | 0
Level 3 | Measured at fair value on a recurring basis | Debt issued designated at fair value |  |  |  |
Disclosure Of Fair Value Measurement Of Liabilities [Line Items] |  |  |  |
Financial liabilities measured at fair value |  | 14,744 | 12,635 | 10,970
Level 3 | Measured at fair value on a recurring basis | Other financial liabilities designated at fair value |  |  |  |
Disclosure Of Fair Value Measurement Of Liabilities [Line Items] |  |  |  |
Financial liabilities measured at fair value |  | 610 | 545 | 716
Level 3 | Measured at fair value on a recurring basis | Other financial liabilities designated at fair value | Financial liabilities related to unit-linked investment contracts |  |  |  |
Disclosure Of Fair Value Measurement Of Liabilities [Line Items] |  |  |  |
Financial liabilities measured at fair value |  | 0 | 0 | 0
Level 3 | Measured at fair value on a recurring basis | Other financial liabilities designated at fair value | Securities financing transactions |  |  |  |
Disclosure Of Fair Value Measurement Of Liabilities [Line Items] |  |  |  |
Financial liabilities measured at fair value |  | 3 | 0 | 0
Level 3 | Measured at fair value on a recurring basis | Other financial liabilities designated at fair value | Over-the-counter debt instruments |  |  |  |
Disclosure Of Fair Value Measurement Of Liabilities [Line Items] |  |  |  |
Financial liabilities measured at fair value |  | $ 592 | $ 526 | $ 697
[1] | <div>The range of inputs is not disclosed, as there is a dispersion of values given the diverse nature of the investments.</div>

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