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FVM - Valuation adjustments reserves on the balance sheet (Detail) - USD ($) $ in Millions | Jun. 30, 2021 | Mar. 31, 2021 | Dec. 31, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2019
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Valuation Adjustment Reserves On The Balance Sheet [Line Items] |  |  |  |  |  |
Deferred day-1 profit or loss reserves | $ 405 | $ 387 | $ 269 | $ 243 | $ 194 | $ 146
Own credit adjustments on financial liabilities designated at fair value | (278) | (400) | (381) |  |  |
CVAs, FVAs, DVAs and other valuation adjustments | $ (956) | $ (977) | $ (959) |  |  |

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- Definition The aggregate difference between the fair value at initial recognition and the transaction price for financial instruments that is yet to be recognised in profit or loss. [Refer: Financial instruments, class [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2020-01-01 -Paragraph 28 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2020-en-r&anchor=para_28_b&doctype=Standard -URIDate 2020-01-01 + Details
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- Definition A component of equity representing the accumulated change in fair value of financial liabilities attributable to change in the credit risk of the liabilities. [Refer: Credit risk [member]; Financial liabilities] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2020-01-01 -Paragraph 78 -Subparagraph e -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2020-en-r&anchor=para_78_e&doctype=Standard -URIDate 2020-01-01 + Details
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Balance Type: | credit
Period Type: | instant

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- Definition The aggregate amount of credit valuation adjustments, funding valuation adjustments, debit valuation adjustments, and other valuation adjustments. + References No definition available. + Details
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Balance Type: | credit
Period Type: | instant

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- References No definition available. + Details
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