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FVM - Movements of level 3 instruments - Liabilities (Detail) - USD ($) $ in Millions | 6 Months Ended
--- | ---
Jun. 30, 2021 | Jun. 30, 2020
Disclosure Of Fair Value Measurement Of Liabilities [Line Items] |  |  |  |
Balance at the beginning of the period |  | $ 325,069 |  |
Balance at the end of period |  | 299,869 |  |
Level 3 |  |  |  |
Disclosure Of Fair Value Measurement Of Liabilities [Line Items] |  |  |  |
Balance at the beginning of the period |  | 15,212 |  |
Balance at the end of period |  | 18,398 |  |
Level 3 | Derivative financial liabilities |  |  |  |
Disclosure Of Fair Value Measurement Of Liabilities [Line Items] |  |  |  |
Balance at the beginning of the period |  | 3,500 | [1] | $ 2,000
Total gains / losses included in comprehensive income - Net gains / losses included in income | [2] | 200 |  | 1,200
Total gains / losses included in comprehensive income - of which: related to Level 3 instruments held at the end of the reporting period |  | 0 |  | 1,100
Purchases |  | 0 |  | 0
Sales |  | (0) |  | (0)
Issuances |  | 700 |  | 500
Settlements |  | 1,200 |  | (800)
Transfers into Level 3 |  | 0 |  | 600
Transfers out of Level 3 |  | 200 |  | (300)
Foreign currency translation |  | 0 |  | 0
Balance at the end of period |  | 2,900 | [1] | 3,300
Level 3 | Derivative financial liabilities | Interest rate contracts |  |  |  |
Disclosure Of Fair Value Measurement Of Liabilities [Line Items] |  |  |  |
Balance at the beginning of the period |  | 500 |  | 100
Total gains / losses included in comprehensive income - Net gains / losses included in income | [2] | (100) |  | 700
Total gains / losses included in comprehensive income - of which: related to Level 3 instruments held at the end of the reporting period |  | (100) |  | 700
Purchases |  | 0 |  | 0
Sales |  | (0) |  | (0)
Issuances |  | 100 |  | 0
Settlements |  | (0) |  | (300)
Transfers into Level 3 |  | 0 |  | 300
Transfers out of Level 3 |  | (0) |  | (0)
Foreign currency translation |  | 0 |  | 0
Balance at the end of period |  | 500 |  | 800
Level 3 | Derivative financial liabilities | Equity / index contracts |  |  |  |
Disclosure Of Fair Value Measurement Of Liabilities [Line Items] |  |  |  |
Balance at the beginning of the period |  | 2,300 |  | 1,300
Total gains / losses included in comprehensive income - Net gains / losses included in income | [2] | 400 |  | 200
Total gains / losses included in comprehensive income - of which: related to Level 3 instruments held at the end of the reporting period |  | 200 |  | 200
Purchases |  | 0 |  | 0
Sales |  | (0) |  | (0)
Issuances |  | 500 |  | 500
Settlements |  | (1,100) |  | (400)
Transfers into Level 3 |  | 0 |  | 0
Transfers out of Level 3 |  | (200) |  | (200)
Foreign currency translation |  | 0 |  | 0
Balance at the end of period |  | 1,900 |  | 1,400
Level 3 | Derivative financial liabilities | Credit derivative contracts |  |  |  |
Disclosure Of Fair Value Measurement Of Liabilities [Line Items] |  |  |  |
Balance at the beginning of the period |  | 500 |  | 500
Total gains / losses included in comprehensive income - Net gains / losses included in income | [2] | (200) |  | 300
Total gains / losses included in comprehensive income - of which: related to Level 3 instruments held at the end of the reporting period |  | (200) |  | 300
Purchases |  | 0 |  | 0
Sales |  | (0) |  | (0)
Issuances |  | 100 |  | 100
Settlements |  | (0) |  | (100)
Transfers into Level 3 |  | 0 |  | 300
Transfers out of Level 3 |  | (0) |  | (100)
Foreign currency translation |  | 0 |  | 0
Balance at the end of period |  | 400 |  | 900
Level 3 | Derivative financial liabilities | Other |  |  |  |
Disclosure Of Fair Value Measurement Of Liabilities [Line Items] |  |  |  |
Balance at the beginning of the period |  | 100 |  | 100
Total gains / losses included in comprehensive income - Net gains / losses included in income | [2] | 100 |  | 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 |  | (100) |  | (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 |  | 100 |  | 100
Level 3 | Debt issued designated at fair value |  |  |  |
Disclosure Of Fair Value Measurement Of Liabilities [Line Items] |  |  |  |
Balance at the beginning of the period |  | 11,000 | [1] | 9,900
Total gains / losses included in comprehensive income - Net gains / losses included in income | [2] | 300 |  | 200
Total gains / losses included in comprehensive income - of which: related to Level 3 instruments held at the end of the reporting period |  | 200 |  | 300
Purchases |  | 0 |  | 0
Sales |  | (0) |  | (0)
Issuances |  | 7,200 |  | 3,900
Settlements |  | (2,900) |  | (3,500)
Transfers into Level 3 |  | 200 |  | 400
Transfers out of Level 3 |  | (800) |  | (1,000)
Foreign currency translation |  | (200) |  | 0
Balance at the end of period |  | 14,700 | [1] | 9,700
Level 3 | Other financial liabilities designated at fair value |  |  |  |
Disclosure Of Fair Value Measurement Of Liabilities [Line Items] |  |  |  |
Balance at the beginning of the period |  | 700 | [1] | 800
Total gains / losses included in comprehensive income - Net gains / losses included in income | [2] | 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 |  | 100 |  | 600
Settlements |  | (200) |  | (300)
Transfers into Level 3 |  | 0 |  | 0
Transfers out of Level 3 |  | (0) |  | (0)
Foreign currency translation |  | 0 |  | 0
Balance at the end of period |  | $ 600 | [1] | $ 1,100
[1] | <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>
[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>

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- Definition The fair value of financial liabilities. [Refer: At fair value [member]; Financial liabilities] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2020-01-01 -Paragraph 25 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2020-en-r&anchor=para_25&doctype=Standard -URIDate 2020-01-01 + Details
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- Definition The gains (losses) recognised in profit or loss for liabilities measured at fair value that are attributable to the change in unrealised gains or losses relating to those liabilities held at the end of the reporting period. [Refer: At fair value [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 13 -IssueDate 2020-01-01 -Paragraph 93 -Subparagraph f -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=13&code=ifrs-tx-2020-en-r&anchor=para_93_f&doctype=Standard -URIDate 2020-01-01 + Details
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- Definition The gains (losses) including exchange differences recognised in profit or loss on the fair value measurement of liabilities. [Refer: At fair value [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 13 -IssueDate 2020-01-01 -Paragraph 93 -Subparagraph e -Clause i -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=13&code=ifrs-tx-2020-en-r&anchor=para_93_e_i&doctype=Standard -URIDate 2020-01-01 + Details
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- Definition The increase in fair value measurement of liabilities resulting from issues of those liabilities. [Refer: At fair value [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 13 -IssueDate 2020-01-01 -Paragraph 93 -Subparagraph e -Clause iii -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=13&code=ifrs-tx-2020-en-r&anchor=para_93_e_iii&doctype=Standard -URIDate 2020-01-01 + Details
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- Definition The increase in the fair value measurement of liabilities resulting from purchases of those liabilities. [Refer: At fair value [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 13 -IssueDate 2020-01-01 -Paragraph 93 -Subparagraph e -Clause iii -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=13&code=ifrs-tx-2020-en-r&anchor=para_93_e_iii&doctype=Standard -URIDate 2020-01-01 + Details
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- Definition The decrease in the fair value measurement of liabilities resulting from settlements. [Refer: At fair value [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 13 -IssueDate 2020-01-01 -Paragraph 93 -Subparagraph e -Clause iii -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=13&code=ifrs-tx-2020-en-r&anchor=para_93_e_iii&doctype=Standard -URIDate 2020-01-01 + Details
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