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FVM - Movements of level 3 instruments - Assets (Detail) - USD ($) $ in Millions | 6 Months Ended
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Jun. 30, 2021 | Jun. 30, 2020
Disclosure Of Fair Value Measurement Of Assets [Line Items] |  |  |  |
Balance at the beginning of the period |  | $ 404,805 |  |
Balance at the end of period |  | 345,820 |  |
Level 3 |  |  |  |
Disclosure Of Fair Value Measurement Of Assets [Line Items] |  |  |  |
Balance at the beginning of the period |  | 8,278 |  |
Balance at the end of period |  | 8,129 |  |
Level 3 | Investment fund units |  |  |  |
Disclosure Of Fair Value Measurement Of Assets [Line Items] |  |  |  |
Balance at the beginning of the period | [1] | 100 |  |
Balance at the end of period | [1] | 100 |  |
Level 3 | Corporate and municipal bonds |  |  |  |
Disclosure Of Fair Value Measurement Of Assets [Line Items] |  |  |  |
Balance at the beginning of the period |  | 1,200 |  |
Balance at the end of period |  | 1,200 |  |
Level 3 | Auction rate securities |  |  |  |
Disclosure Of Fair Value Measurement Of Assets [Line Items] |  |  |  |
Balance at the beginning of the period |  | 1,500 |  |
Balance at the end of period |  | 1,600 |  |
Level 3 | Equity instruments |  |  |  |
Disclosure Of Fair Value Measurement Of Assets [Line Items] |  |  |  |
Balance at the beginning of the period | [1] | 700 |  |
Balance at the end of period | [1] | 700 |  |
Level 3 | Financial assets at fair value held for trading |  |  |  |
Disclosure Of Fair Value Measurement Of Assets [Line Items] |  |  |  |
Balance at the beginning of the period |  | 2,300 | [2] | $ 1,800
Total gains / (losses) included in comprehensive income - Net gains / (losses) included in income | [3] | 0 |  | (100)
Total gains / (losses) included in comprehensive income - of which: related to Level 3 instruments held at the end of the reporting period |  | 0 |  | 0
Purchases |  | 300 |  | 300
Sales |  | (800) |  | (1,000)
Issuances |  | 400 |  | 1,400
Settlements |  | (0) |  | (0)
Transfers into Level 3 |  | 200 |  | 300
Transfers out of Level 3 |  | (200) |  | (0)
Foreign currency translation |  | 0 |  | 0
Balance at the end of period |  | 2,100 | [2] | 2,700
Level 3 | Financial assets at fair value held for trading | Investment fund units |  |  |  |
Disclosure Of Fair Value Measurement Of Assets [Line Items] |  |  |  |
Balance at the beginning of the period |  | 0 | [2] | 0
Total gains / (losses) included in comprehensive income - Net gains / (losses) included in income | [3] | 0 |  | 0
Total gains / (losses) included in comprehensive income - of which: related to Level 3 instruments held at the end of the reporting period |  | 0 |  | 0
Purchases |  | 0 |  | 0
Sales |  | (0) |  | (0)
Issuances |  | 0 |  | 0
Settlements |  | (0) |  | (0)
Transfers into Level 3 |  | 0 |  | 0
Transfers out of Level 3 |  | (0) |  | (0)
Foreign currency translation |  | 0 |  | 0
Balance at the end of period |  | 0 | [2] | 0
Level 3 | Financial assets at fair value held for trading | Corporate and municipal bonds |  |  |  |
Disclosure Of Fair Value Measurement Of Assets [Line Items] |  |  |  |
Balance at the beginning of the period |  | 800 | [2] | 500
Total gains / (losses) included in comprehensive income - Net gains / (losses) included in income | [3] | 0 |  | 0
Total gains / (losses) included in comprehensive income - of which: related to Level 3 instruments held at the end of the reporting period |  | 0 |  | 0
Purchases |  | 100 |  | 200
Sales |  | (100) |  | (200)
Issuances |  | 0 |  | 0
Settlements |  | (0) |  | (0)
Transfers into Level 3 |  | 0 |  | 200
Transfers out of Level 3 |  | (100) |  | (0)
Foreign currency translation |  | 0 |  | 0
Balance at the end of period |  | 800 | [2] | 800
Level 3 | Financial assets at fair value held for trading | Loans |  |  |  |
Disclosure Of Fair Value Measurement Of Assets [Line Items] |  |  |  |
Balance at the beginning of the period |  | 1,100 | [2] | 800
Total gains / (losses) included in comprehensive income - Net gains / (losses) included in income | [3] | 0 |  | (100)
Total gains / (losses) included in comprehensive income - of which: related to Level 3 instruments held at the end of the reporting period |  | 0 |  | 0
Purchases |  | 100 |  | 0
Sales |  | (500) |  | (600)
Issuances |  | 400 |  | 1,400
Settlements |  | (0) |  | (0)
Transfers into Level 3 |  | 0 |  | 0
Transfers out of Level 3 |  | (200) |  | (0)
Foreign currency translation |  | 0 |  | 0
Balance at the end of period |  | 1,000 | [2] | 1,600
Level 3 | Financial assets at fair value held for trading | Other |  |  |  |
Disclosure Of Fair Value Measurement Of Assets [Line Items] |  |  |  |
Balance at the beginning of the period |  | 400 | [2] | 400
Total gains / (losses) included in comprehensive income - Net gains / (losses) included in income | [3] | (100) |  | 0
Total gains / (losses) included in comprehensive income - of which: related to Level 3 instruments held at the end of the reporting period |  | (100) |  | 0
Purchases |  | 0 |  | 0
Sales |  | (200) |  | (200)
Issuances |  | 0 |  | 0
Settlements |  | (0) |  | (0)
Transfers into Level 3 |  | 100 |  | 100
Transfers out of Level 3 |  | (0) |  | (0)
Foreign currency translation |  | 0 |  | 0
Balance at the end of period |  | 300 | [2] | 300
Level 3 | Financial assets at fair value not held for trading |  |  |  |
Disclosure Of Fair Value Measurement Of Assets [Line Items] |  |  |  |
Balance at the beginning of the period |  | 3,900 | [2] | 4,000
Total gains / (losses) included in comprehensive income - Net gains / (losses) included in income | [3] | 100 |  | (100)
Total gains / (losses) included in comprehensive income - of which: related to Level 3 instruments held at the end of the reporting period |  | 100 |  | (100)
Purchases |  | 700 |  | 500
Sales |  | (300) |  | (600)
Issuances |  | 0 |  | 0
Settlements |  | (0) |  | (0)
Transfers into Level 3 |  | 100 |  | 100
Transfers out of Level 3 |  | (0) |  | (0)
Foreign currency translation |  | 0 |  | 0
Balance at the end of period |  | 4,500 | [2] | 3,700
Level 3 | Financial assets at fair value not held for trading | Loans |  |  |  |
Disclosure Of Fair Value Measurement Of Assets [Line Items] |  |  |  |
Balance at the beginning of the period |  | 900 | [2] | 1,200
Total gains / (losses) included in comprehensive income - Net gains / (losses) included in income | [3] | 0 |  | 0
Total gains / (losses) included in comprehensive income - of which: related to Level 3 instruments held at the end of the reporting period |  | 0 |  | 0
Purchases |  | 400 |  | 400
Sales |  | (100) |  | (500)
Issuances |  | 0 |  | 0
Settlements |  | (0) |  | (0)
Transfers into Level 3 |  | 0 |  | 0
Transfers out of Level 3 |  | (0) |  | (0)
Foreign currency translation |  | 0 |  | 0
Balance at the end of period |  | 1,100 | [2] | 1,000
Level 3 | Financial assets at fair value not held for trading | Auction rate securities |  |  |  |
Disclosure Of Fair Value Measurement Of Assets [Line Items] |  |  |  |
Balance at the beginning of the period |  | 1,500 | [2] | 1,500
Total gains / (losses) included in comprehensive income - Net gains / (losses) included in income | [3] | 0 |  | (100)
Total gains / (losses) included in comprehensive income - of which: related to Level 3 instruments held at the end of the reporting period |  | 0 |  | (100)
Purchases |  | 0 |  | 0
Sales |  | (0) |  | (0)
Issuances |  | 0 |  | 0
Settlements |  | (0) |  | (0)
Transfers into Level 3 |  | 0 |  | 0
Transfers out of Level 3 |  | (0) |  | (0)
Foreign currency translation |  | 0 |  | 0
Balance at the end of period |  | 1,600 | [2] | 1,400
Level 3 | Financial assets at fair value not held for trading | Equity instruments |  |  |  |
Disclosure Of Fair Value Measurement Of Assets [Line Items] |  |  |  |
Balance at the beginning of the period |  | 500 | [2] | 500
Total gains / (losses) included in comprehensive income - Net gains / (losses) included in income | [3] | 100 |  | 0
Total gains / (losses) included in comprehensive income - of which: related to Level 3 instruments held at the end of the reporting period |  | 100 |  | 0
Purchases |  | 100 |  | 100
Sales |  | (100) |  | (0)
Issuances |  | 0 |  | 0
Settlements |  | (0) |  | (0)
Transfers into Level 3 |  | 0 |  | 100
Transfers out of Level 3 |  | (0) |  | (0)
Foreign currency translation |  | 0 |  | 0
Balance at the end of period |  | 600 | [2] | 500
Level 3 | Financial assets at fair value not held for trading | Other |  |  |  |
Disclosure Of Fair Value Measurement Of Assets [Line Items] |  |  |  |
Balance at the beginning of the period |  | 1,000 | [2] | 700
Total gains / (losses) included in comprehensive income - Net gains / (losses) included in income | [3] | 0 |  | 0
Total gains / (losses) included in comprehensive income - of which: related to Level 3 instruments held at the end of the reporting period |  | 0 |  | 0
Purchases |  | 200 |  | 100
Sales |  | (0) |  | (100)
Issuances |  | 0 |  | 0
Settlements |  | (0) |  | (0)
Transfers into Level 3 |  | 0 |  | 0
Transfers out of Level 3 |  | (0) |  | (0)
Foreign currency translation |  | 0 |  | 0
Balance at the end of period |  | 1,200 | [2] | 800
Level 3 | Derivative financial instruments |  |  |  |
Disclosure Of Fair Value Measurement Of Assets [Line Items] |  |  |  |
Balance at the beginning of the period |  | 1,800 | [2] | 1,300
Total gains / (losses) included in comprehensive income - Net gains / (losses) included in income | [3] | (200) |  | 300
Total gains / (losses) included in comprehensive income - of which: related to Level 3 instruments held at the end of the reporting period |  | (100) |  | 400
Purchases |  | 0 |  | 0
Sales |  | (0) |  | (0)
Issuances |  | 500 |  | 500
Settlements |  | (400) |  | (500)
Transfers into Level 3 |  | 0 |  | 0
Transfers out of Level 3 |  | (100) |  | (100)
Foreign currency translation |  | 0 |  | 0
Balance at the end of period |  | 1,500 | [2] | 1,500
Level 3 | Derivative financial instruments | Interest rate contracts |  |  |  |
Disclosure Of Fair Value Measurement Of Assets [Line Items] |  |  |  |
Balance at the beginning of the period |  | 500 | [2] | 300
Total gains / (losses) included in comprehensive income - Net gains / (losses) included in income | [3] | (100) |  | 200
Total gains / (losses) included in comprehensive income - of which: related to Level 3 instruments held at the end of the reporting period |  | (100) |  | 200
Purchases |  | 0 |  | 0
Sales |  | (0) |  | (0)
Issuances |  | 0 |  | 0
Settlements |  | (100) |  | (200)
Transfers into Level 3 |  | 0 |  | 0
Transfers out of Level 3 |  | (0) |  | (0)
Foreign currency translation |  | 0 |  | 0
Balance at the end of period |  | 300 | [2] | 300
Level 3 | Derivative financial instruments | Equity / index contracts |  |  |  |
Disclosure Of Fair Value Measurement Of Assets [Line Items] |  |  |  |
Balance at the beginning of the period |  | 900 | [2] | 600
Total gains / (losses) included in comprehensive income - Net gains / (losses) included in income | [3] | 100 |  | 0
Total gains / (losses) included in comprehensive income - of which: related to Level 3 instruments held at the end of the reporting period |  | 100 |  | 100
Purchases |  | 0 |  | 0
Sales |  | (0) |  | (0)
Issuances |  | 300 |  | 500
Settlements |  | (400) |  | (200)
Transfers into Level 3 |  | 0 |  | 0
Transfers out of Level 3 |  | (100) |  | (100)
Foreign currency translation |  | 0 |  | 0
Balance at the end of period |  | 800 | [2] | 800
Level 3 | Derivative financial instruments | Credit derivative contracts |  |  |  |
Disclosure Of Fair Value Measurement Of Assets [Line Items] |  |  |  |
Balance at the beginning of the period |  | 300 | [2] | 400
Total gains / (losses) included in comprehensive income - Net gains / (losses) included in income | [3] | (100) |  | 100
Total gains / (losses) included in comprehensive income - of which: related to Level 3 instruments held at the end of the reporting period |  | (100) |  | 100
Purchases |  | 0 |  | 0
Sales |  | (0) |  | (0)
Issuances |  | 100 |  | 0
Settlements |  | (0) |  | (200)
Transfers into Level 3 |  | 0 |  | 0
Transfers out of Level 3 |  | (0) |  | (0)
Foreign currency translation |  | 0 |  | 0
Balance at the end of period |  | 300 | [2] | 400
Level 3 | Derivative financial instruments | Other |  |  |  |
Disclosure Of Fair Value Measurement Of Assets [Line Items] |  |  |  |
Balance at the beginning of the period |  | 0 | [2] | 0
Total gains / (losses) included in comprehensive income - Net gains / (losses) included in income | [3] | 0 |  | 0
Total gains / (losses) included in comprehensive income - of which: related to Level 3 instruments held at the end of the reporting period |  | 0 |  | 0
Purchases |  | 0 |  | 0
Sales |  | (0) |  | (0)
Issuances |  | 0 |  | 0
Settlements |  | (0) |  | (0)
Transfers into Level 3 |  | 0 |  | 0
Transfers out of Level 3 |  | (0) |  | (0)
Foreign currency translation |  | 0 |  | 0
Balance at the end of period |  | $ 0 | [2] | $ 0
[1] | <div>The range of inputs is not disclosed, as there is a dispersion of values given the diverse nature of the investments.</div>
[2] | <div>Total Level 3 assets as of 30 June 2021 were USD 8.1 billion (31 December 2020: USD 8.3 billion). Total Level 3 liabilities as of 30 June 2021 were USD 18.4 billion (31 December 2020: USD 15.2 billion).</div>
[3] | <div>Total Level 3 assets as of 30 June 2021 were USD 8.1 billion (31 December 2020: USD 8.3 billion). Total Level 3 liabilities as of 30 June 2021 were USD 18.4 billion (31 December 2020: USD 15.2 billion).</div>

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