Disclosure of contingent liabilities [line items] Disclosure of contingent liabilities [line items] – interest expense Interest expense Report of Directors Financial Review Risk Report [Abstract] Report of Directors Financial Review Risk Report [Abstract] Board of the Directors Report Risk Report [Abstract] Disclosure of geographical areas [line items] Disclosure of geographical areas [line items] Net cash flows from the purchase and sale of property, plant and equipment Purchase of property, plant and equipment, classified as investing activities Interest received Interest Received Interest Received Dividends paid on ordinary shares Dividends paid, ordinary shares Disclosure of detailed information about business combination [line items] Disclosure of detailed information about business combination [line items] Loans and advances to banks Loans and advances to banks Loans and advances to banks Net change in expected credit loss provision and other movements Increase (decrease) in other provisions Notional contract amount of trading instruments Notional Amount Of Derivative Trading Instruments Notional Amount Of Derivative Trading Instruments Levels of fair value hierarchy [domain] Levels of fair value hierarchy [domain] Intersegment Elimination of intersegment amounts [member] 2028 Later than two years and not later than three years [member] Dividends on preference shares classified as equity Dividends paid, other shares $1,500m 6.750% Perpetual Subordinated Contingent Convertible Securities $1,500m 6.750% Perpetual Subordinated Contingent Convertible Securities [Member] $1,500m 6.750% Perpetual Subordinated Contingent Convertible Securities Underwriting Underwriting Income (Loss)1 Underwriting Income (Loss)1 Amounts offset on derivative liabilities Gross financial assets set off against financial liabilities subject to offsetting, enforceable master netting arrangements or similar agreements Credit impaired Credit Impaired [Member] Credit Impaired [Member] Custody Business In Germany Custody Business In Germany [Member] Custody Business In Germany Disclosure of the effect of changes in significant unobservable assumptions to reasonably possible alternatives, liabilities Disclosure of sensitivity analysis of fair value measurement to changes in unobservable inputs, liabilities [text block] – equity instruments designated at fair value through other comprehensive income – equity instruments designated at fair value through other comprehensive income Other comprehensive income, net of tax, gains (losses) from investments in equity instruments Sales Sales, fair value measurement, assets Purchase of financial investments Purchase of financial instruments, classified as investing activities Disclosure of interests in associates Disclosure of interests in associates [text block] Financial assets designated and otherwise mandatorily measured at fair value through profit or loss Designated and otherwise mandatorily measured at fair value through profit or loss Financial assets at fair value through profit or loss, designated upon initial recognition or subsequently, category [member] Goodwill and intangible assets Intangible assets and goodwill Statement of comprehensive income [abstract] Statement of comprehensive income [abstract] Statement of changes in equity [line items] Statement of changes in equity [line items] Disclosure Of Analysis Of Income And Expense [Table] Disclosure Of Analysis Of Income And Expense [Table] Disclosure Of Analysis Of Income And Expense [Table] Attributable to: Comprehensive income attributable to [abstract] Forex litigation Foreign Exchange-Related Investigations And Litigation [Member] Foreign Exchange-Related Investigations And Litigation Unemployment rate (%) Unemployment rate (%, min) Unemployment rate (%, max) Inputs, Assumptions And Estimation Techniques Used To Determine Expected Credit Losses, Unemployment Rate Inputs, Assumptions And Estimation Techniques Used To Determine Expected Credit Losses, Unemployment Rate Number of companies involved in litigation Number Of Companies Involved In Litigation Number Of Companies Involved In Litigation Investments in associates reported in separate financial statements Carrying amount Investments in associates reported in separate financial statements – other structured notes Structured Notes, Other Liabilities [Member] Structured Notes, Other Liabilities [Member] Bonds Bonds, Liabilities [Member] Bonds, Liabilities Disclosure of geographical areas [table] Disclosure of geographical areas [table] Dividends proposed or declared before financial statements authorised for issue but not recognised as distribution to owners Dividends proposed or declared before financial statements authorised for issue but not recognised as distribution to owners Up-to-date Current [member] Statement of financial position [abstract] Statement of financial position [abstract] Other operating income/(expense) Other operating income (expense) Cover [Abstract] Financial investments Financial Assets At Fair Value Through Other Comprehensive Income And At Amortised Cost Financial Assets At Fair Value Through Other Comprehensive Income And At Amortised Cost Share buy-backs Payments to acquire or redeem entity's shares Maximum Maximum [Member] Change in bps due to reasonably possible favourable changes in key assumptions Increase (Decrease) In Basis Points Due To Reasonably Possible Favourable Changes In Key Assumptions Increase (Decrease) In Basis Points Due To Reasonably Possible Favourable Changes In Key Assumptions Effective tax rate in the long-term Description Of Long Term Effective Tax Rate In Future Estimate Of Value In Use Description Of Long Term Effective Tax Rate In Future Estimate Of Value In Use Disposal Groups [Abstract] Disposal Groups [Abstract] Unused amounts reversed Unused provision reversed, other provisions HSBC Continental Europe HSBC Continental Europe [Member] HSBC Continental Europe Other Other Disposal Groups [Member] Other Disposal Groups Alpha Prime Fund Limited Alpha Prime Fund Limited [Member] Alpha Prime Fund Limited Sales Sales, fair value measurement, liabilities Share premium account Share premium Cash flows from financing activities Cash flows from (used in) financing activities [abstract] Damages sought Loss Contingency, Damages Sought1 Loss Contingency, Damages Sought1 – cash flow hedges Other Comprehensive Income, Net Of Tax, Cash Flow Hedges, Excluding Disposal Of Subsidiary Other Comprehensive Income, Net Of Tax, Cash Flow Hedges, Excluding Disposal Of Subsidiary 30 and greater DPD Thirty Days Or Greater Than Thirty Days Past Due [Member] Thirty Days Or Greater Than Thirty Days Past Due [Member] Total comprehensive income for the period Comprehensive income Disclosure of credit risk Disclosure of credit risk [text block] Net remeasurement of ECL arising from transfer of stage Increase (Decrease) Through Remeasurement Of Expected Credit Losses From Transfer Of Stages, Financial Assets Increase (Decrease) Through Remeasurement Of Expected Credit Losses From Transfer Of Stages, Financial Assets Basis of preparation and material accounting policies Disclosure of basis of preparation of financial statements [text block] Capital redemption reserves reclassification to retained earnings Increase (Decrease) Through Transfer Between Capital Redemption Reserves And Retained Earnings, Equity Increase (Decrease) Through Transfer Between Capital Redemption Reserves And Retained Earnings, Equity Reverse repurchase agreements – non-trading Repurchase agreements – non-trading Repurchase Agreement [Member] Repurchase Agreement [Member] Number of hearings Loss Contingency, Number Of Hearings Loss Contingency, Number Of Hearings Document Fiscal Period Focus Document Fiscal Period Focus Total assets Total external assets Assets Assets Associates [domain] Associates [domain] Repurchase agreements – non-trading Repurchase agreements and cash collateral on securities lent – foreign exchange-linked notes Structured Notes, FX-Linked [Member] Structured Notes, FX-Linked [Member] Credit Credit spread Credit risk [member] Derivatives, trading liabilities Financial Liabilities At Fair Value Through Profit Or Loss Classified As Held For Trading And Derivatives [Member] Financial Liabilities At Fair Value Through Profit Or Loss Classified As Held For Trading And Derivatives [Member] Investment, Name [Domain] Investment, Name [Domain] New issuances Issues, fair value measurement, liabilities Industry Sector 1 [Axis] Industry Sector 1 [Axis] Industry Sector 1 [Axis] Other portfolios Other Portfolios, Assets [Member] Other Portfolios, Assets [Member] Balance Sheet Components [Axis] Balance Sheet Components [Axis] Balance Sheet Components [Axis] MEC Scenario MEC Scenario [Member] MEC Scenario Number of economic scenarios to calculate ECL Total Number Of Economic Scenarios To Calculate ECL Total Number Of Economic Scenarios To Calculate ECL Insurance finance reserve Reserve of insurance finance income (expenses) from insurance contracts issued excluded from profit or loss that will be reclassified to profit or loss [member] Provisions Classes of other provisions [domain] Cards Card Services Fee Income Card Services Fee Income Increase in ECL Impairment loss (reversal of impairment loss) recognised in profit or loss, loans and advances Common equity tier 1 capital: regulatory adjustments [Abstract] Common Equity Tier One Capital Regulator Adjustments [Abstract] Common Equity Tier One Capital Regulator Adjustments Assets held for sale, liabilities of disposal groups held for sale and business acquisitions Disclosure of non-current assets or disposal groups classified as held for sale [text block] Portfolio diversification Risk diversification effect [member] Transfer of gain on disposal of equity investments at FVOCI to retained earnings Increase (decrease) from transfer of gain (loss) on disposal of equity instruments to retained earnings, net Increase (decrease) from transfer of gain (loss) on disposal of equity instruments to retained earnings, net Precious metals fix-related investigations and litigation Precious Metals Fix-Related Litigation [Member] Precious Metals Fix-Related Litigation [Member] – net finance expenses Other comprehensive income, before tax, insurance finance income (expenses) from insurance contracts issued excluded from profit or loss that will be reclassified to profit or loss Subordinated loan capital issued Proceeds from issue of subordinated liabilities Interests in associates and joint ventures Investments in subsidiaries, joint ventures and associates reported in separate financial statements Operating segments excluding intersegment elimination Operating Segments Excluding Intersegment Elimination [Member] Operating Segments Excluding Intersegment Elimination Assets Assets [abstract] Forecast period Inputs, Assumptions And Estimation Techniques Used To Determine Expected Credit Losses, Forecast Period Inputs, Assumptions And Estimation Techniques Used To Determine Expected Credit Losses, Forecast Period long-dated swaptions Other Derivative Assets, Long-Dated Swaptions [Member] Other Derivative Assets, Long-Dated Swaptions [Member] Transfers in Transfers into Level 3 of fair value hierarchy, liabilities Fair value over five years Fair Value Of Investments In Associates For Which There Are Quoted Market Prices, Over Five Years Fair Value Of Investments In Associates For Which There Are Quoted Market Prices, Over Five Years Disposal groups classified as held for sale Disposal groups classified as held for sale [member] Revenue Revenue [abstract] Number of economic scenarios drawn from consensus forecasts and distributional estimates Number Of Economic Scenarios Drawn From Consensus Forecasts And Distributional Estimates Number Of Economic Scenarios Drawn From Consensus Forecasts And Distributional Estimates – other comprehensive income reclassified to the income statement on disposal of interest in an associate Reclassification Adjustments On Dilution Of Associate, Net Of Tax Reclassification Adjustments On Dilution Of Associate, Net Of Tax US mortgage securitisation litigation United States Mortgage Securitisation Litigation [Member] United States Mortgage Securitisation Litigation Amortisation and impairment of intangible assets Amortisation And Impairment (Reversal Of Impairment) Recognised In Profit Or Loss, Intangible Assets Other Than Goodwill Amortisation And Impairment (Reversal Of Impairment) Recognised In Profit Or Loss, Intangible Assets Other Than Goodwill – financial investments – at amortised cost Financial assets at amortised cost – other Other Portfolio Assets, Miscellaneous [Member] Other Portfolio Assets, Miscellaneous [Member] Galicia Galicia [Member] Galicia Credit impairment of financial instruments [axis] Credit impairment of financial instruments [axis] – credit derivatives Credit Derivative Assets [Member] Credit Derivative Assets Financial Instruments [Abstract] Financial Instruments [Abstract] Financial Instruments [Abstract] – equity securities Equity investments [member] Confidence level Confidence level corresponding to results of technique other than confidence level technique used for determining risk adjustment for non-financial risk – insurance service expense Insurance service expenses from insurance contracts issued Cash flows from investing activities Cash flows from (used in) investing activities [abstract] Commodity and other Commodity price risk [member] Dividends proposed or declared before financial statements authorised for issue but not recognised as distribution to owners per share (in USD per share) Dividends proposed or declared before financial statements authorised for issue but not recognised as distribution to owners per share Effect of dilutive potential ordinary shares (in shares) Dilutive effect of convertible instruments on weighted average number of ordinary shares Downside 2 scenario allowance for ECL 100% Downside 2 scenario Downside Scenario , Additional [Member] Downside Scenario , Additional Types of financial assets [domain] Types of financial assets [domain] Net income from financial instruments held for trading or managed on a fair value basis Trading income (expense) Current dividend payables Current dividend payables Cost of share-based payment arrangements Increase (decrease) through share-based payment transactions, equity Increase (decrease) through share-based payment transactions, equity Value at risk Value at risk Hedges of net investment in foreign operations Hedges of net investment in foreign operations [member] Number of claims dismissed Loss Contingency, Claims Dismissed, Number 1 Loss Contingency, Claims Dismissed, Number 1 Exchange differences Other comprehensive income, net of tax, exchange differences on translation of foreign operations Reconciliation of changes in fair value measurement, liabilities [abstract] Reconciliation of changes in fair value measurement, liabilities [abstract] Proportion of ownership interest in associate Proportion of ownership interest in associate Reconciliation of changes in other provisions [abstract] Reconciliation of changes in other provisions [abstract] Common equity tier 1 capital before regulatory adjustments Common Equity Tier One Capital, Before Regulatory Adjustments Common Equity Tier One Capital, Before Regulatory Adjustments long-dated swaptions Other Derivative Liabilities, Long-Dated Swaptions [Member] Other Derivative Liabilities, Long-Dated Swaptions [Member] ECL estimates, % weight assigned Inputs And Assumptions And Estimation Techniques, Expected Credit Loss, Weight Assigned To Scenarios Inputs And Assumptions And Estimation Techniques, Expected Credit Loss, Weight Assigned To Scenarios Disposals, wind-downs, acquisitions and related costs Revenue From Disposals, Acquisitions, And Investment In Businesses Revenue From Disposals, Acquisitions, And Investment In Businesses Major ordinary share transactions Major ordinary share transactions [member] Exchange differences in respect of cash and cash equivalents Effect of exchange rate changes on cash and cash equivalents – interest rate derivatives Derivative Assets, Interest Rate Derivatives [Member] Derivative Assets, Interest Rate Derivatives Interim Report 2026 and statutory accounts Disclosure of information about interim financial reporting [text block] Debt securities in issue Debt instruments issued Geographical areas [domain] Geographical areas [domain] Retail Retail Lending [Member] Retail Lending Other Increase (decrease) through other movements, financial assets Report Of The Directors Financial Review Risk Report [Abstract] Report Of The Directors Financial Review Risk Report [Abstract] Board of the Directors Report Risk Report [Abstract] Impairment of interest in associate Impairment of interest in associate Impairment losses of interest in BoCom associate Impairment Loss Recognised in Profit (Loss), Interest In Associates Impairment Loss Recognised in Profit (Loss), Interest In Associates Insurance Contracts, Life Other Contracts Insurance Contracts, Life Other Contracts [Member] Insurance Contracts, Life Other Contracts Financial instruments including loan commitments and financial guarantees Financial Instruments Including Loan Commitments And Financial Guarantees [Member] Financial Instruments Including Loan Commitments And Financial Guarantees [Member] Insurance manufacturing subsidiaries Insurance Manufacturing Subsidiaries [Member] Insurance Manufacturing Subsidiaries [Member] Non-current assets held for sale Noncurrent Assets Or Disposal Groups Classified As Held For Sale, Noncurrent Assets Noncurrent Assets Or Disposal Groups Classified As Held For Sale, Noncurrent Assets Contributions paid to defined benefit plans Payments Of Contributions To Defined Benefit Plans Payments Of Contributions To Defined Benefit Plans Tier 2 capital Tier Two Risk Based Capital 1 Tier Two Risk Based Capital 1 Loans Loans, Assets [Member] Loans, Assets Levels of fair value hierarchy [axis] Levels of fair value hierarchy [axis] Total share-holders’ equity Dividends to shareholders Equity attributable to owners of parent [member] Increase/(decrease) through foreign exchange reclassified to income statement on disposal of a foreign operation Increase/(Decrease) Through Foreign Exchange Reclassified To Income Statement On Disposal Of A Foreign Operation, Equity Increase/(Decrease) Through Foreign Exchange Reclassified To Income Statement On Disposal Of A Foreign Operation, Equity Schedules of financial investments Disclosure of financial assets [text block] Changes in ownership interest in subsidiaries Increase (decrease) through changes in ownership interests in subsidiaries that do not result in loss of control, equity Disclosure of compliance with regulatory capital requirements under banking regulations Disclosure Of Compliance With Regulatory Capital Requirements Under Banking Regulations [Table Text Block] Disclosure Of Compliance With Regulatory Capital Requirements Under Banking Regulations Other liabilities Other liabilities Loans and advances to customers Loans and advances to customers (net) Loans and advances to customers Amounts offset on derivative assets Gross financial liabilities set off against financial assets subject to offsetting, enforceable master netting arrangements or similar agreements Dividends received from associates Dividends received, classified as operating activities – before income taxes Other comprehensive income, before tax, gains (losses) on remeasurements of defined benefit plans – income taxes Income tax relating to remeasurements of defined benefit plans included in other comprehensive income Downside Two Scenario Downside Two Scenario [Member] Downside Two Scenario Credit Derivative Liabilities Credit Derivative Liabilities [Member] Credit Derivative Liabilities IWPB International Wealth and Premier Banking (IWPB) [Member] International Wealth and Premier Banking (IWPB) Entity Central Index Key Entity Central Index Key Merger and other 
reserves Merger reserve [member] Increase (decrease) in ECL Increase (Decrease) In Allowance For Expected Credit Losses Increase (Decrease) In Allowance For Expected Credit Losses Valuation techniques used in fair value measurement [axis] Valuation techniques used in fair value measurement [axis] – transfers to stage 3 Increase (Decrease) Through Transfers, Financial Assets, Transfer To Stage 3 Increase (Decrease) Through Transfers, Financial Assets, Transfer To Stage 3 Fair value gains on property revaluation – property revaluation Other comprehensive income, net of tax, gains (losses) on revaluation of property, plant and equipment, right-of-use assets and intangible assets Attributable to: Profit (loss), attributable to [abstract] Equity and liabilities [abstract] Equity and liabilities [abstract] Loans and advances to bank and customers including loan commitments and financial guarantees Loans And Advances To Banks And Customers, Including Loan Commitments And Financial Guarantees [Member] Loans And Advances To Banks And Customers, Including Loan Commitments And Financial Guarantees [Member] Assets of disposal groups held for sale Disposal Group Assets [Abstract] Disposal Group Assets Unfavourable changes reflected in OCI Gain (Loss) Recognized In Other Comprehensive Income Due To Unfavourable Changes In Significant Unobservable Inputs Gain (Loss) Recognized In Other Comprehensive Income Due to Unfavourable Changes In Significant Unobservable Inputs – fair value losses Gains (losses) on cash flow hedges, before tax Net fee income Disclosure of fee and commission income (expense) [text block] Net interest income – of which: net interest income/(expense) Interest income (expense) Model – Discounted cash flow Discounted cash flow [member] Reverse repurchase agreements – non-trading Reverse repurchase agreements and cash collateral on securities borrowed Total gains/(losses) recognised in other comprehensive income (‘OCI’) Gains (losses) recognised in other comprehensive income including exchange differences, fair value measurement, assets Actions seeking damages Loss Contingency, Number Of US Dollar Libor-Related Actions Seeking Damages Loss Contingency, Number Of US Dollar Libor-Related Actions Seeking Damages Transfers out Transfers out of Level 3 of fair value hierarchy, liabilities Notional contract amount of hedging instruments Notional Nominal amount of hedging instrument – equity derivatives Equity Derivative Assets [Member] Equity Derivative Assets Operating profit Profit (loss) from operating activities Loss contingency, number of hearings in early procedural stage Loss Contingency, Number Of Hearings In Early Procedural Stage Loss Contingency, Number Of Hearings In Early Procedural Stage Trading liabilities Financial liabilities at fair value through profit or loss that meet definition of held for trading, category [member] Discontinued operations Discontinued operations [member] Risk-weighted assets as a percentage of total assets in the long term Description Of Risk-Weighted Assets As Percentage Of Total Assets In Future Estimate Of Value In Use Description Of Risk-Weighted Assets As Percentage Of Total Assets In Future Estimate Of Value In Use securitisation swaps Other Derivative Liabilities, Securitisation Swaps [Member] Other Derivative Liabilities, Securitisation Swaps [Member] Current Value/Cost Current estimate of future cash outflows to be paid to fulfil obligation, measurement input [member] Total capital Capital 1 Capital 1 Other portfolios Other Portfolios, Liabilities [Member] Other Portfolios, Liabilities [Member] Related Party [Abstract] Related Party [Abstract] Related Party [Abstract] Remittances Remittance Fee And Commission Income Remittance Fee And Commission Income Other credit judgements Other Retail Lending Adjustments [Member] Other Retail Lending Adjustments Dividends Payable [Table] Dividends Payable1 [Table] Dividends Payable1 [Table] Provisions Disclosure of provisions [text block] Statement of cash flows [abstract] Statement of cash flows [abstract] Disclosure of financial assets [table] Disclosure of financial assets [table] – interest rate derivatives Derivative Liabilities, Interest Rate Derivatives [Member] Derivative Liabilities, Interest Rate Derivatives Type of measurement of expected credit losses [axis] Type of measurement of expected credit losses [axis] Common equity tier 1 ratio Common Equity Tier 1, Percentage Of Total Risk Exposure Common Equity Tier 1, Percentage Of Total Risk Exposure Broking income Brokerage fee income Tier 2 capital before regulatory adjustments Tier Two Risk Based Capital, Before Regulatory Adjustments Tier Two Risk Based Capital, Before Regulatory Adjustments Counterparty Name [Domain] Counterparty Name [Domain] Long-term asset growth rate Description Of Growth Rate Used To Extrapolate Long-Term Asset Projections In Current Estimate Of Value In Use Growth Rate Used To Extrapolate Long-Term Asset Projections In Current Estimate Of Value In Use Satisfactory Satisfactory [Member] Satisfactory [Member] Disclosure of value at risk Disclosure Of Value At Risk Explanatory [Table Text Block] Disclosure Of Value At Risk Explanatory [Table Text Block] – before income taxes Other comprehensive income, before tax, change in fair value of financial liability attributable to change in credit risk of liability Number of global functions Number Of Global Functions Number Of Global Functions Financial liabilities designated at fair value Financial assets and liabilities designated and otherwise mandatorily measured at fair value through profit or loss Financial liabilities at fair value through profit or loss, designated upon initial recognition or subsequently, category [member] Net finance income from insurance contracts – insurance finance income recognised in other comprehensive income Other comprehensive income, net of tax, insurance finance income (expenses) from insurance contracts issued excluded from profit or loss that will be reclassified to profit or loss Purchases Purchases, fair value measurement, liabilities Prepayments, accrued income and other assets Prepayments, Accrued Income And Other Assets Prepayments, Accrued Income And Other Assets Other comprehensive income/(expense) Other comprehensive income [abstract] Disclosure of detailed information about hedging instruments [line items] Disclosure of detailed information about hedging instruments [line items] Share of other comprehensive income/(expense) of associates and joint ventures Share Of Other Comprehensive Income Of Associates And Joint Ventures Accounted For Using Equity Method, Before Reclassifications, Net Of Tax Share Of Other Comprehensive Income Of Associates And Joint Ventures Accounted For Using Equity Method, Before Reclassifications, Net Of Tax Dividends [Domain] Dividends1 [Domain] [Domain] for Dividends1 [Axis] – income taxes Income tax relating to cash flow hedges included in other comprehensive income CANADA CANADA Stock repurchase amount Stock Repurchase Program, Authorized Amount Stock Repurchase Program, Authorized Amount Other geographies Other Countries/Territories [Member] Other Countries [Member] Classes of share capital [domain] Classes of share capital [domain] Cost-income ratio Description Of Cost-Income Ratio Used In Current Estimate Of Value In Use Description Of Cost-Income Ratio Used In Current Estimate Of Value In Use Additional tier 1 capital Additional Tier One Capital Additional Tier One Capital Chinese mainland CHINA Probability Inputs, Assumptions And Estimation Techniques Used To Determine Expected Credit Losses, Probability Inputs, Assumptions And Estimation Techniques Used To Determine Expected Credit Losses, Probability Net cash flow from change in stakes of subsidiaries Payments For (Proceeds From) Subsidiaries Payments For (Proceeds From) Subsidiaries Classes of contingent liabilities [domain] Classes of contingent liabilities [domain] GDP growth rate, 5 year average Inputs, Assumptions And Estimation Techniques Used To Determine Expected Credit Losses, GDP Growth Rate, Five Year Average Inputs, Assumptions And Estimation Techniques Used To Determine Expected Credit Losses, GDP Growth Rate, Five Year Average – fair value gains transferred to the income statement on disposal Reclassification adjustments on financial assets measured at fair value through other comprehensive income, before tax Classes of financial liabilities [axis] Classes of financial liabilities [axis] Classes of financial liabilities [domain] Classes of financial liabilities [domain] $1,250m 6.750% Perpetual Subordinated Contingent Convertible Securities $1,250m 6.750% Perpetual Subordinated Contingent Convertible Securities [Member] $1,250m 6.750% Perpetual Subordinated Contingent Convertible Securities – income taxes Income tax relating to investments in equity instruments included in other comprehensive income Disclosure of other provisions [line items] Disclosure of other provisions [line items] – bonds Other Portfolios, Liabilities, Bonds [Member] Other Portfolios, Liabilities, Bonds Total gains/(losses) recognised in other comprehensive income (‘OCI’) Gains (losses) recognised in other comprehensive income including exchange differences, fair value measurement, liabilities Total regulatory adjustments to tier 2 capital Additional Tier One Capital, Regulatory Adjustments Additional Tier One Capital, Regulatory Adjustments Derivatives, trading assets and trading liabilities Financial Assets At Fair Value Through Profit Or Loss Classified As Held For Trading And Derivatives [Member] Financial Assets At Fair Value Through Profit Or Loss Classified As Held For Trading And Derivatives [Member] Share buy-backs Increase (decrease) through treasury share transactions, equity HSBC Bank (Uruguay) S.A. HSBC Bank (Uruguay) S.A. [Member] HSBC Bank (Uruguay) S.A. Insurance service result Insurance service result HSBC Bank Malta p.l.c. HSBC Bank Malta p.l.c. [Member] HSBC Bank Malta p.l.c. Total regulatory adjustments to common equity tier 1 Common Equity Tier One Capital, Regulatory Adjustments Common Equity Tier One Capital, Regulatory Adjustments Fair value Fair value of investments in associates for which there are quoted market prices $1,000m 4.000% Perpetual Subordinated Contingent Convertible Securities $1,000m 4.000% Perpetual Subordinated Contingent Convertible Securities [Member] $1,000m 4.000% Perpetual Subordinated Contingent Convertible Securities – transfers from stage 2 to stage 1 Increase (Decrease) Through Transfers, Financial Assets, Transfers Out Of Stage 2 Into Stage 1 Increase (Decrease) Through Transfers, Financial Assets, Transfers Out Of Stage 2 Into Stage 1 Types of financial liabilities [axis] Types of financial liabilities [axis] Share premium reclassification to retained earnings Increase (Decrease) Through Transfer Between Share Premium To Retained Earnings, Equity Increase (Decrease) Through Transfer Between Share Premium To Retained Earnings, Equity Madoff Securities Madoff Securities [Member] Madoff Securities [Member] Disclosure of the effect of changes in significant unobservable assumptions to reasonably possible alternatives, assets Disclosure of sensitivity analysis of fair value measurement to changes in unobservable inputs, assets [text block] Trading assets Financial assets at fair value through profit or loss, classified as held for trading, category [member] Purchases Purchases, fair value measurement, assets Oil and gas, average sale price (in USD per barrel) Oil and Gas, Average Sale Price Per Unit UAE UNITED ARAB EMIRATES New IFRSs [axis] New IFRSs [axis] Types of customers [domain] Types of customers [domain] Called up share capital Issued capital – other contingent liabilities Other contingent liabilities [member] Shares issued under employee remuneration and share plans Increase (decrease) through exercise of options, equity Total gains or losses recognised in profit or loss Gains (losses) recognised in profit or loss including exchange differences, fair value measurement, assets Categories of financial assets [axis] Categories of financial assets [axis] Assets held for sale Non-current assets held for sale [member] Other Provisions, Contingent Liabilities And Contingent Assets [Abstract] Other Provisions, Contingent Liabilities And Contingent Assets [Abstract] Other Provisions, Contingent Liabilities And Contingent Assets [Abstract] Restitution of Securities Restitution of Securities [Member] Restitution of Securities – documentary credits and short-term trade-related transactions Documentary Credits And Short-term Trade-related Transactions [Member] Documentary Credits and Short-term Trade-related Transactions [Member] Types of financial liabilities [domain] Types of financial liabilities [domain] Provisions Other provisions, beginning balance Other provisions, ending balance Other provisions Financial liabilities Financial liabilities, beginning balance Financial liabilities, ending balance Financial liabilities Tax expense Tax expense (income) Disposal groups Non Current Assets Or Disposal Groups Classified As Held For Sale, Disposal Groups Non Current Assets Or Disposal Groups Classified As Held For Sale, Disposal Groups Loan and other credit-related commitments Loan And Other Credit-Related Commitments [Member] Loan And Other Credit-Related Commitments [Member] Significant unobservable input, liabilities, percentage Significant unobservable input, liabilities Hong Kong HONG KONG Events after the balance sheet date Disclosure of events after reporting period [text block] Stage 1 12-month expected credit losses [member] Proceeds from the sale and maturity of financial investments Proceeds from sales or maturity of financial instruments, classified as investing activities Central bank policy rate, 5 year average Inputs, Assumptions And Estimation Techniques Used To Determine Expected Credit Losses, Central Bank Policy Rate, Five Year Average Inputs, Assumptions And Estimation Techniques Used To Determine Expected Credit Losses, Central Bank Policy Rate, Five Year Average Cash flows from operating activities Cash flows from (used in) operating activities [abstract] HSBC Austrailia HSBC Austrailia [Member] HSBC Austrailia Disclosure of analysis of single amount of discontinued operations Disclosure of analysis of single amount of discontinued operations [text block] Share of profit in associates and joint ventures Share of profit in associates and joint ventures Share of profit (loss) of associates and joint ventures accounted for using equity method Long-term profit growth rate Description Of Growth Rate Used To Extrapolate Long-Term Profit Projections In Current Estimate Of Value In Use Growth Rate Used To Extrapolate Long-Term Profit Projections In Current Estimate Of Value In Use Cash and balances at central banks Cash and bank balances at central banks Insurance Contracts, Life Direct Participating And Investment DPF contracts Insurance Contracts, Life Direct Participating And Investment DPF contracts [Member] Insurance Contracts, Life Direct Participating And Investment DPF contracts General and administrative expenses Selling, general and administrative expense Document Period End Date Document Period End Date Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items] Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items] [Line Items] for Disclosure Of Fair Value Measurement Of Assets And Liabilities [Table] Disclosure of macroeconomic variables and probabilities Disclosure Of Macroeconomic Variables And Probabilities [Table Text Block] Disclosure Of Macroeconomic Variables And Probabilities Non-adjusting events after reporting period [domain] Non-adjusting events after reporting period [domain] Disclosure of classes of share capital [line items] Disclosure of classes of share capital [line items] Maturity [axis] Maturity [axis] UK UNITED KINGDOM Classes of financial instruments [axis] Classes of financial instruments [axis] Goodwill Goodwill Investigations involving HSBC Private Bank (Suisse) SA Investigations involving HSBC Private Bank (Suisse) SA [Member] Investigations involving HSBC Private Bank (Suisse) SA Recoveries Reversal of impairment loss recognised in profit or loss – other reserves reclassified to income statement on disposal or dilution of a foreign operation Increase/(Decrease) Through Other Reserves Reclassified To Income Statement On Disposal Of A Foreign Operation, Equity Increase/(Decrease) Through Other Reserves Reclassified To Income Statement On Disposal Of A Foreign Operation, Equity Associates [axis] Associates [axis] Document Type Document Type Shareholder assets and liabilities Assets And Liabilities Excluding Insurance Contracts [Member] Assets And Liabilities Excluding Insurance Contracts [Member] Classes of financial assets [axis] Classes of financial assets [axis] Financial assets at FVOCI reserve Reserve of gains and losses on financial assets measured at fair value through other comprehensive income [member] – fee expense Less: fee expense Fee and commission expense Disposal Group Name [Domain] Disposal Group Name [Domain] Disposal Group Name [Domain] Profit or loss [abstract] Profit or loss [abstract] Transfers of financial instruments: Increase (decrease) through transfers, financial assets Statistical Measurement [Axis] Statistical Measurement [Axis] Disclosure of analysis of single amount of discontinued operations [table] Disclosure of analysis of single amount of discontinued operations [table] Classes of assets [axis] Classes of assets [axis] Capital adequacy ratio Description Of Capital Adequacy Ratio In Current Estimate Of Value In Use Description Of Capital Adequacy Ratio In Current Estimate Of Value In Use Operating segments Constant currency Operating segments [member] Total capital ratio Total Capital, Percentage Of Total Risk Exposure Total Capital, Percentage Of Total Risk Exposure 2030 Later than four years and not later than five years [member] Disclosure of significant unobservable inputs used in fair value measurement of assets Disclosure of significant unobservable inputs used in fair value measurement of assets [text block] Change in loans, deposits and other operating assets and liabilities Increase (Decrease) In Loans, Deposits, And Other Operating Assets And Liabilities Increase (Decrease) In Loans, Deposits, And Other Operating Assets And Liabilities – equity-linked notes Structured Notes, Equity-Linked One [Member] Structured Notes, Equity-Linked One [Member] France FRANCE Items of contingent liabilities [axis] Items of contingent liabilities [axis] Total shareholders’ equity Equity attributable to owners of parent – income taxes Income tax relating to financial assets measured at fair value through other comprehensive income included in other comprehensive income Earnings per share [abstract] Earnings per share [abstract] Range [axis] Range [axis] Components of equity [axis] Components of equity [axis] Profit before tax Profit before tax Profit (loss) before tax Events After Reporting Period [Abstract] Events After Reporting Period [Abstract] Events After Reporting Period [Abstract] Interim Financial Reporting [Abstract] Interim Financial Reporting [Abstract] Interim Financial Reporting [Abstract] Central bank policy rate (annual average, %) Central bank policy rate (%, min) Inputs, Assumptions And Estimation Techniques Used To Determine Expected Credit Losses, Central Bank Policy Rate Inputs, Assumptions And Estimation Techniques Used To Determine Expected Credit Losses, Central Bank Policy Rate Ontario and Quebec superior courts Ontario and Quebec Superior Courts [Member] Ontario and Quebec Superior Courts Disclosure of other provisions [table] Disclosure of other provisions [table] – income taxes Income tax relating to insurance finance income (expenses) from insurance contracts issued included in other comprehensive income that will be reclassified to profit or loss Classes of financial instruments [domain] Classes of financial instruments [domain] CIB Corporate and Institutional Banking (CIB) [Member] Corporate and Institutional Banking (CIB) Disclosure of detailed information about business combination [table] Disclosure of detailed information about business combination [table] Redemption of securities Reduction of issued capital Reduction of issued capital – other equity holders Comprehensive Income, Attributable To Other Equity Owners Of Parent Comprehensive Income, Attributable To Other Equity Owners Of Parent total return swaps Return Swap Liabilities [Member] Return Swap Liabilities Adjusted profit before tax and balance sheet data Disclosure of operating segments [text block] Basic, number of shares (in shares) Weighted average number of ordinary shares used in calculating basic earnings per share Changes in related party transactions Changes in related party transactions Changes in related party transactions Recoverable amount of asset or cash-generating unit Recoverable amount of asset or cash-generating unit Summary of contingent liabilities, contractual commitments and guarantees Disclosure Of Detailed Information About Contingent Liabilities, Contractual Commitments, And Guarantees [Table Text Block] Disclosure Of Detailed Information About Contingent Liabilities, Contractual Commitments, And Guarantees [Table Text Block] Other reserves Other reserves Punitive damages Estimated Financial Effect Of Contingent Liabilities, Punitive Damages Estimated Financial Effect Of Contingent Liabilities, Punitive Damages Loss on financial assets at FV through P&L Gains (losses) on financial assets at fair value through profit or loss Bank of Communications Co., Limited Bank Of Communications Co., Limited [Member] Bank Of Communications Co., Limited [Member] – other financial assets Other financial assets Financial assets designated and otherwise mandatorily measured at fair value through profit or loss Financial assets designated and otherwise mandatorily measured at fair value through profit or loss Financial assets at fair value through profit or loss, mandatorily measured at fair value, other than those classified as held for trading Changes to models used for ECL calculation Increase (decrease) through changes in models or risk parameters, financial assets – financial Financial Loan Sector [Member] Financial Loan Sector [Member] Sri Lanka retail banking business Sri Lanka retail banking business [Member] Sri Lanka retail banking business – POCI POCI Financial instruments purchased or originated credit-impaired [member] – other Other Portfolio Liabilities, Miscellaneous [Member] Other Portfolio Liabilities, Miscellaneous [Member] Subordinated liabilities Subordinated liabilities – standby facilities, credit lines and other commitments to lend Standby Facilities, Credit Lines, And Other Commitments To Lend [Member] Standby Facilities, Credit Lines, and Other Commitments to Lend [Member] Cash and securities Cash And Securities [Member] Cash And Securities Net cash from financing activities Cash flows from (used in) financing activities – other countries/territories Other Countries [Member] Other Countries [Member] Fair value hedges Fair value hedges [member] Favourable changes reflected in profit or loss Gain (Loss) Recognized In Profit Or Loss Due To Favourable Changes In Significant Unobservable Inputs Gain (Loss) Recognized In Profit Or Loss Due to Favourable Changes In Significant Unobservable Inputs Gross total fair values of derivative assets Gross Derivative Financial Assets, Including Not Subject to Enforceable Master Netting Arrangements Gross Financial Assets Subject To Offsetting, Enforceable Master Netting Arrangements Or Similar Agreements And Financial Assets Not Subject to Enforceable Master Netting Arrangements Statement of changes in equity [table] Statement of changes in equity [table] Net sales/(purchases) of own shares for market-making and investment purposes Proceeds (Payments) From Sale (Purchase) Of Treasury Shares Proceeds (Payments) From Sale (Purchase) Of Treasury Shares Unrealised gains or losses recognised in profit or loss relating to liabilities held at end of period Gains (losses) recognised in profit or loss attributable to change in unrealised gains or losses for liabilities held at end of period, fair value measurement Assets and liabilities related to insurance contracts Assets And Liabilities Related To Insurance Contracts [Member] Assets And Liabilities Related To Insurance Contracts [Member] Market proxy Market comparable companies [member] Number of mortgage securitisation trusts (more than) Number Of Mortgage Securitisation Trusts Number Of Mortgage Securitisation Trusts Equity volatility Historical volatility for shares, measurement input [member] Classes of assets [domain] Classes of assets [domain] Current Fiscal Year End Date Current Fiscal Year End Date Types of hedges [domain] Types of hedges [domain] Dividends paid on ordinary shares (in usd per share) Dividends paid, ordinary shares per share Changes in fair value of financial liabilities designated at fair value upon initial recognition arising from changes in own credit risk – changes in fair value of financial liabilities designated at fair value upon initial recognition arising from changes in own credit risk Other comprehensive income, net of tax, change in fair value of financial liability attributable to change in credit risk of liability Minimum Bottom of range [member] At cost Financial liabilities at amortised cost, category [member] Hongkong and Shanghai Banking Corporation Hongkong And Shanghai Banking Corporation [Member] Hongkong And Shanghai Banking Corporation Profit after tax Profit for the period Profit (loss) Cash flow hedges Other comprehensive income, net of tax, cash flow hedges Financial assets Financial assets, beginning balance Financial assets, ending balance Financial assets Financial assets Balance Sheet Components [Domain] Balance Sheet Components [Domain] Balance Sheet Components [Domain] Egypt Retail Banking Business Egypt Retail Banking Business [Member] Egypt Retail Banking Business Income Statement Location [Axis] Income Statement Location1 [Axis] Income Statement Location1 [Axis] Changes to risk parameters – credit quality Increase (Decrease) Through Changes To Risk Parameters, Credit Quality, Financial Assets Increase (Decrease) Through Changes To Risk Parameters, Credit Quality, Financial Assets – bonds Other Portfolios, Bonds [Member] Other Portfolios, Bonds Price – Net asset value Net asset value [member] Legal proceedings and regulatory matters Disclosure of contingent liabilities [text block] Segmental analysis Disclosure of entity's operating segments [text block] – forward asset purchases and forward deposits placed Forward Asset Purchases And Forward Deposits Placed [Member] Forward Asset Purchases and Forward Deposits Placed [Member] Senator Fund SPC Senator Fund SPC [Member] Senator Fund SPC Retained earnings Retained earnings [member] Classes of entity's own equity instruments [axis] Classes of entity's own equity instruments [axis] 2027 2027 Later than one year and not later than two years [member] Disclosure of contingent liabilities [table] Disclosure of contingent liabilities [table] Assets and liabilities not classified as held for sale Assets and liabilities not classified as held for sale [member] Internal credit grades [domain] Internal credit grades [domain] Analysis of income and expense [abstract] Analysis of income and expense [abstract] Reclassification adjustments on exchange differences on translation of foreign operations, net of tax – foreign exchange losses reclassified to the income statement on disposal or dilution of a foreign operation Reclassification adjustments on exchange differences on translation of foreign operations, net of tax IFRS 9 IFRS 9 [member] Discount rate Discount rate used in current estimate of value in use Liabilities Liabilities [abstract] Derivatives Other Derivatives, Assets [Member] Other Derivatives, Assets [Member] – ordinary shareholders of the parent company Comprehensive Income, Attributable To Ordinary Equity Owners Of Parent Comprehensive Income, Attributable To Ordinary Equity Owners Of Parent Categories of financial assets [domain] Categories of financial assets [domain] Carrying amount Carrying amount [member] Dividends Disclosure of dividends [text block] other Other Derivative Assets, Miscellaneous [Member] Other Derivative Assets, Miscellaneous [Member] Constant currency cost efficiency ratio Adjusted Cost Efficiency Ratio Adjusted Cost Efficiency Ratio Unobservable inputs [domain] Unobservable inputs [domain] Insurance contract liabilities Insurance contracts issued that are liabilities Non-credit impaired Financial instruments not credit-impaired [member] Cancellation of shares Cancellation of treasury shares Report Of The Directors Financial Review Risk Report Disclosure Of Audited Information Included In Report Of The Directors Financial Review Risk Report [Text Block] Disclosure Of Audited Information Included In Report Of The Directors Financial Review Risk Report [Text Block] Tier 1 capital Tier One Capital Tier One Capital Fair value of hedging liabilities Hedging instrument, liabilities Hong Kong currency notes in circulation Currency Notes In Circulation Currency Notes In Circulation Imports/exports Import And Export Trade Finance Fee Income Import And Export Trade Finance Fee Income – fourth interim dividend Fourth Interim Dividend [Member] Fourth Interim Dividend Mexico MEXICO Items that will be reclassified subsequently to profit or loss when specific conditions are met: Components of other comprehensive income that will be reclassified to profit or loss, net of tax [abstract] Dilution loss of interest in associate Dilution loss of interest in BoCom associate Dilution Losses From Investments In Associates Dilution Losses From Investments In Associates Number of pending actions Loss Contingency, Number Of Pending Actions Loss Contingency, Number Of Pending Actions Derivatives Derivatives [member] Statistical Measurement [Domain] Statistical Measurement [Domain] long-dated single stock options Other Derivative Liabilities, Long-Dated Single Stock Options [Member] Other Derivative Liabilities, Long-Dated Single Stock Options [Member] Foreign 
exchange
reserve Reserve of exchange differences on translation [member] Other equity instruments interest rate Equity Instruments, Interest Rate Equity Instruments, Interest Rate Financial investments – at amortised cost Financial assets at amortised cost, class [member] Total operating expenses Total operating expenses Operating expenses Operating expense Liabilities of disposal groups held for sale Disposal Group Liabilities [Abstract] Disposal Group Liabilities Other associates and joint ventures Other Associates And Joint Ventures [Member] Other Associates And Joint Ventures Classes of share capital [axis] Classes of share capital [axis] – personal Personal Personal Loans Sector [Member] Personal Loans Sector [Member] Fair Value Measurement [Abstract] Fair Value Measurement [Abstract] Fair Value Measurement [Abstract] Insurance contract assets Insurance contracts issued that are assets Credit-related modifications that resulted in derecognition Decrease Through Derecognition, Credit Related Modifications, Financial Assets Decrease Through Derecognition, Credit Related Modifications, Financial Assets Fair value of trading assets Derivative financial assets held for trading – financial assets designated and otherwise mandatorily measured at fair value through profit or loss Financial assets at fair value through profit or loss, designated upon initial recognition or subsequently Favourable changes reflected in OCI Gain (Loss) Recognized In Other Comprehensive Income Due To Favourable Changes In Significant Unobservable Inputs Gain (Loss) Recognized In Other Comprehensive Income Due to Favourable Changes In Significant Unobservable Inputs Total equity Equity beginning of period Equity end of period Total equity Equity Fair value of trading liabilities Derivative financial liabilities held for trading Effects of hyperinflation – effects of hyperinflation Other Comprehensive Income, Net Of Tax, Gains (Losses) From Effects Of Hyperinflation Other Comprehensive Income, Net Of Tax, Gains (Losses) From Effects Of Hyperinflation – share for the period – share of other comprehensive income of associates and joint ventures Share of other comprehensive income of associates and joint ventures accounted for using equity method that will be reclassified to profit or loss, net of tax Other equity instruments Other equity interest Disclosure of dividends to shareholders Disclosure Of Dividends To Shareholders [Table Text Block] Disclosure of Dividends To Shareholders [Table Text Block] Change in expected credit losses gross of recoveries and other credit impairment charges Adjustments for impairment loss (reversal of impairment loss) recognised in profit or loss, loans and advances Other assets and investment properties Other assets Corporate Information And Statement Of IFRS Compliance [Abstract] Corporate information and statement of IFRS compliance [abstract] Items that will not be reclassified subsequently to profit or loss: Components of other comprehensive income that will not be reclassified to profit or loss, net of tax [abstract] Level 1 Level 1 of fair value hierarchy [member] Bonds Bonds, Assets [Member] Bonds, Assets Discount rate Discount rate, measurement input [member] ECL Economic Scenario [Domain] ECL Economic Scenario [Domain] ECL Economic Scenario [Domain] Level 2 Level 2 of fair value hierarchy [member] Dividends paid to shareholders of the parent company and non-controlling interests Dividends paid, classified as financing activities Disclosure of fair value adjustments on financial instruments Disclosure Of Fair Value Adjustments On Financial Instruments [Table Text Block] Disclosure Of Fair Value Adjustments On Financial Instruments [Table Text Block] Trading liabilities Financial liabilities at fair value through profit or loss that meet definition of held for trading Categories Of Key Assumptions [Domain] Categories Of Key Assumptions [Domain] [Domain] for Categories Of Key Assumptions [Axis] Provisions including pensions Adjustments for provisions Subordinated liabilities Subordinated Liabilities [Member] Subordinated Liabilities [Member] Non-trading portfolios Non-trading Portfolios [Member] Non-trading Portfolios [Member] Loans and advances to customer growth rate Description Of Loans And Advances To Customer Growth Rate Used In Current Estimate Of Value In Use Description Of Loans And Advances To Customer Growth Rate Used In Current Estimate Of Value In Use Financial liabilities designated at fair value Financial liabilities at fair value through profit or loss, designated upon initial recognition or subsequently Other non-cash items included in profit before tax Other adjustments for non-cash items Cash flow hedges Cash flow hedges [member] Dividends received Dividends received Net fee income Fee and commission income (expense) Transfers in Transfers into Level 3 of fair value hierarchy, assets Operating expenses Expenses by nature [abstract] Continuing and discontinued operations [axis] Continuing and discontinued operations [axis] South Africa Business In South Africa [Member] Business In South Africa Capital ratios Capital Ratios [Abstract] Capital Ratios Deferred tax assets Deferred tax assets Non-
controlling
interests Non-controlling interests [member] – non-controlling interests Comprehensive income, attributable to non-controlling interests Types Of Market Risk Portfolios [Axis] Types Of Market Risk Portfolios [Axis] Types Of Market Risk Portfolios [Axis] Customer remediation Refunds provision [member] Unfavourable changes reflected in profit or loss Gain (Loss) Recognized In Profit Or Loss Due To Unfavourable Changes In Significant Unobservable Inputs Gain (Loss) Recognized In Profit Or Loss Due to Unfavourable Changes In Significant Unobservable Inputs Statement of changes in equity [abstract] Statement of changes in equity [abstract] HSBC Private Bank (Suisse) SA HSBC Private Bank (Suisse) SA [Member] HSBC Private Bank (Suisse) SA Disclosure of major classes of assets and liabilities held for sale Assets and Liabilities Held For Sale [Table Text Block] Assets and Liabilities Held For Sale Retained earnings Retained earnings Measurement [domain] Measurement [domain] Significant unobservable input, assets, percentage Significant unobservable input, assets – corporate and commercial Corporate And Commercial Loans Sector [Member] Corporate And Commercial Loans Sector [Member] – net income from assets and liabilities of insurance businesses, including related derivatives, measured at fair value through profit or loss Net Income From Assets And Liabilities Of Insurance Businesses, Including Related Derivatives, Measured At Fair Value Through Profit Or Loss [Member] Net Income From Assets And Liabilities Of Insurance Businesses, Including Related Derivatives, Measured At Fair Value Through Profit Or Loss Types of risks [domain] Types of risks [domain] Net loss on acquisition/disposal of subsidiaries, businesses, associates and joint ventures Adjustments for gain (loss) on disposal of investments in subsidiaries, joint ventures and associates Fairfield Fairfield [Member] Fairfield Funds under management Portfolio and other management fee income Legal Entity [Axis] Legal Entity [Axis] Unallocated impairment losses Non Current Assets Or Disposal Groups Classified As Held For Sale, Disposal Groups, Impairment Loss Non Current Assets Or Disposal Groups Classified As Held For Sale, Disposal Groups, Impairment Loss Derivatives Fair value of derivative assets – derivatives Derivative financial assets Subsidiaries [axis] Subsidiaries [axis] Hong Kong Government certificates of indebtedness Government Certificates Of Indebtedness Government Certificates Of Indebtedness – ordinary shareholders of the parent company Profit Profit (loss), attributable to ordinary equity holders of parent entity, used in calculating basic earnings per share Going concern Disclosure of going concern [text block] Geographical [Domain] Geographical [Domain] – transfers from stage 1 to stage 2 Increase (Decrease) Through Transfers, Financial Assets, Transfers Out Of Stage 1 Into Stage 2 Increase (Decrease) Through Transfers, Financial Assets, Transfers Out Of Stage 1 Into Stage 2 Trading assets Trading assets Financial assets at fair value through profit or loss, classified as held for trading Common equity tier 1 capital Common Equity Tier One Capital 1 Common Equity Tier One Capital 1 Disclosure of financial assets that are either past due or impaired [table] Disclosure of financial assets that are either past due or impaired [table] Geographical areas [axis] Geographical areas [axis] Consensus Upside scenario allowance for ECL 100% consensus Upside scenario Upside Scenario [Member] Upside Scenario Expected credit losses as a percentage of customer advances in the short to medium term Description Of Expected Credit Losses As Percentage Of Customer Advances In Current Estimate Of Value In Use Description Of Expected Credit Losses As Percentage Of Customer Advances In Current Estimate Of Value In Use Disclosure Of Fair Value Measurement Of Assets And Liabilities [Table] Disclosure Of Fair Value Measurement Of Assets And Liabilities [Table] Disclosure Of Fair Value Measurement Of Assets And Liabilities [Table] GDP growth rate Inputs, Assumptions And Estimation Techniques Used To Determine Expected Credit Losses, GDP Growth Rate, One Year Average Inputs, Assumptions And Estimation Techniques Used To Determine Expected Credit Losses, GDP Growth Rate, One Year Average – net income or losses from financial instruments held for trading or managed on a fair value basis Net Income From Financial Instruments Held For Trading Or Managed On A Fair Value Basis [Member] Net Income From Financial Instruments Held For Trading Or Managed On A Fair Value Basis [Member] Debt instruments at FVOCI Financial assets measured at fair value through other comprehensive income, category [member] Segments [domain] Segments [domain] Cash and cash equivalents at the beginning of the period Cash and cash equivalents at the end of the period Cash and cash equivalents Dividends Payable [Line Items] Dividends Payable1 [Line Items] [Line Items] for Dividends Payable1 [Table] Disclosure of non-adjusting events after reporting period [line items] Disclosure of non-adjusting events after reporting period [line items] Total liabilities and equity Equity and liabilities US UNITED STATES Exchange and other movements Increase (decrease) through net exchange differences, other provisions Classes of entity's own equity instruments [domain] Classes of entity's own equity instruments [domain] Redemption of preference shares and other equity instruments Payments of other equity instruments Credit cards Retail Overdrafts And Credit Cards [Member] Retail Overdrafts And Credit Cards [Member] Credit impaired Financial instruments credit-impaired after purchase or origination [member] Operating income ratio Operating Income Ratio Operating Income Ratio Disclosure of analysis of single amount of discontinued operations [line items] Disclosure of analysis of single amount of discontinued operations [line items] Forecast term Inputs, Assumptions And Estimation Techniques Used To Determine Value In Use, Short To Medium Forecast Term Inputs, Assumptions And Estimation Techniques Used To Determine Value In Use, Short To Medium Forecast Term Reconciliation of changes in fair value measurement, assets [abstract] Reconciliation of changes in fair value measurement, assets [abstract] Global custody Global Custody Fee And Commission Income Global Custody Fee And Commission Income Foreign exchange and others Increase (decrease) through foreign exchange and other movements, financial assets Interest rate volatility Interest rate, measurement input [member] Operating Segments [Abstract] Operating Segments [Abstract] Operating Segments [Abstract] Herald Fund SPC Herald Fund SPC [Member] Herald Fund SPC – income taxes Income tax relating to changes in fair value of financial liability attributable to change in credit risk of liability included in other comprehensive income Tier 1 ratio Tier One, Percentage Of Total Risk Exposure Tier One, Percentage Of Total Risk Exposure Disclosure of detailed information about hedging instruments Disclosure of detailed information about hedging instruments [text block] Interest rate Interest rate risk [member] – first interim dividend First Interim Dividend [Member] First Interim Dividend Fair values of financial instruments carried at fair value Fair values of financial instruments not carried at fair value Disclosure of fair value of financial instruments [text block] Total Provisions, Excluding Contractual Commitments [Member] Provisions, Excluding Contractual Commitments [Member] Disclosure of financial assets that are either past due or impaired [line items] Disclosure of financial assets that are either past due or impaired [line items] Categories of financial liabilities [domain] Categories of financial liabilities [domain] Other movements Increase (decrease) through other changes, equity Interest paid Interest Paid Interest Paid Commitments to which the impairment requirements in IFRS 9 are applied where HSBC has become party to an irrevocable commitment Off-balance sheet commitments Off-balance Sheet Commitments Off-balance Sheet Commitments Transactions with related parties Disclosure of related party [text block] Classes of financial assets [domain] Classes of financial assets [domain] New issuances Issues, fair value measurement, assets Compliance with International Financial Reporting Standards Statement of IFRS compliance [text block] Level 3 Level 3 of fair value hierarchy [member] Account services Account Services Fee Income Account Services Fee Income Use of estimates and judgements Disclosure of accounting judgements and estimates [text block] Financial investments Financial Assets At Amortised Cost And At Fair Value Through Other Comprehensive Income, Category [Member] Financial Assets At Amortised Cost And At Fair Value Through Other Comprehensive Income, Category [Member] Net losses relating to sale of business operations Gain/(loss) recognised on assets held for sale Gain (loss) recognised on measurement to fair value less costs to sell or on disposal of assets or disposal groups constituting discontinued operation Unobservable inputs [axis] Unobservable inputs [axis] Disclosure of classes of share capital [table] Disclosure of classes of share capital [table] Assets written off Decrease through write-off, financial assets Segment consolidation items [domain] Segment consolidation items [domain] Risk-weighted assets as a percentage of total assets in the short to medium term Description Of Risk-Weighted Assets As Percentage Of Total Assets In Current Estimate Of Value In Use Description Of Risk-Weighted Assets As Percentage Of Total Assets In Current Estimate Of Value In Use Strong Strong [Member] Strong [Member] – performance and other guarantees Performance and other guarantees not considered for IFRS 9 Performance And Other Guarantee Contracts [Member] Performance And Other Guarantee Contracts [Member] Singapore Insurance Singapore Life Insurance Business [Member] Singapore Life Insurance Business – other income/(losses) Other Income (Loss) [Member] Other Income (Loss) Past due status [axis] Past due status [axis] Other equity instruments Total coupons on capital securities classified as equity Other equity interest [member] House price growth, 5 year average Inputs, Assumptions And Estimation Techniques Used To Determine Expected Credit Losses, House Price Growth, Five Year Average Inputs, Assumptions And Estimation Techniques Used To Determine Expected Credit Losses, House Price Growth, Five Year Average Number of historical banking relationships Number Of Historical Banking Relationships Number Of Historical Banking Relationships Net cash from operating activities Cash flows from (used in) operating activities Interests in associates and joint ventures Disclosure of interests in other entities [text block] Entity [Domain] Entity [Domain] Disclosure Of Analysis Of Income And Expense [Line Items] Disclosure Of Analysis Of Income And Expense [Line Items] [Line Items] for Disclosure Of Analysis Of Income And Expense [Table] – equity derivatives Equity Derivative Liabilities [Member] Equity Derivative Liabilities foreign exchange options Other Derivative Assets, Foreign Exchange Options [Member] Other Derivative Assets, Foreign Exchange Options [Member] Document Fiscal Year Focus Document Fiscal Year Focus Adjustments for non-cash items: Adjustments to reconcile profit (loss) [abstract] Structured notes Structured Notes, Liabilities [Member] Structured Notes, Liabilities [Member] Loans and advances to customers Loans and advances to customers at amortised cost Loans And Advances To Customers [Member] Loans And Advances To Customers [Member] Disclosure of detailed information about financial instruments Disclosure of detailed information about financial instruments [text block] Net loss/(gain) from investing activities Gain (Loss) From Investing Activities Gain (Loss) From Investing Activities Called up share capital and share premium Issued Capital And Share Premium [Member] Issued Capital And Share Premium [Member] Total regulatory adjustments to additional tier 1 capital Total regulatory adjustments to additional tier 1 capital Total regulatory adjustments to additional tier 1 capital Equity correlation Equity Correlation, Measurement Input [Member] Equity Correlation, Measurement Input [Member] Increase in financial assets ECL income statement change for the period Increase (decrease) in financial assets Categories Of Key Assumptions [Axis] Categories Of Key Assumptions [Axis] Categories Of Key Assumptions [Axis] Classes of other provisions [axis] Classes of other provisions [axis] Components in VIU calculation Number Of Main Components In Value-In-Use Calculation Number Of Main Components In Value-In-Use Calculation – foreign exchange derivatives Foreign Exchange Derivative Assets [Member] Foreign Exchange Derivative Assets Future accounting developments Disclosure of expected impact of initial application of new standards or interpretations [text block] – insurance service revenue Insurance revenue French Home And Other Loans French Home And Other Loans [Member] French Home And Other Loans Fair value Not measured at fair value in statement of financial position but for which fair value is disclosed [member] Disaggregation of insurance contracts [axis] Disaggregation of insurance contracts [axis] Australian Home and Personal Loans Portfolio Australian Home and Personal Loans Portfolio [Member] Australian Home and Personal Loans Portfolio Derivatives Fair value of derivative liabilities Derivative financial liabilities Ordinary shares Ordinary shares [member] Disclosure of reconciliation of changes in loss allowance Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [text block] Liabilities of disposal groups held for sale Liabilities included in disposal groups classified as held for sale Earnings per share Disclosure of earnings per share [text block] Gross carrying amount Gross carrying amount [member] long-dated single stock options Other Derivative Assets, Long-Dated Single Stock Options [Member] Other Derivative Assets, Long-Dated Single Stock Options [Member] Inflation (annual average growth rate, %) Inflation rate (YoY % change, min) Inflation rate (YoY % change, max) Inputs, Assumptions And Estimation Techniques Used To Determine Expected Credit Losses, Inflation Rate Inputs, Assumptions And Estimation Techniques Used To Determine Expected Credit Losses, Inflation Rate Loans Loans, Liabilities [Member] Loans, Liabilities Unemployment rate, 5 year average Inputs, Assumptions And Estimation Techniques Used To Determine Expected Credit Losses, Unemployment Rate, Five Year Average Inputs, Assumptions And Estimation Techniques Used To Determine Expected Credit Losses, Unemployment Rate, Five Year Average – other exchange differences Gains (losses) on exchange differences on translation of foreign operations, net of tax Insurance finance expense Insurance finance expense Insurance finance income (expenses) from insurance contracts issued recognised in profit or loss 2026 2026 Not later than one year [member] Current tax liabilities Current tax liabilities Financial assets and off-balance sheet loan commitments Financial Assets And Off-balance Sheet Loan Commitments Financial Assets And Off-balance Sheet Loan Commitments – fee income Fee income Fee and commission income Sub-standard Sub-standard1 [Member] Sub-standard1 [Member] – financial assets at fair value through other comprehensive income Financial assets measured at fair value through other comprehensive income HSBC Securities Services (Luxembourg) S.A. HSBC Securities Services (Luxembourg) S.A. [Member] HSBC Securities Services (Luxembourg) S.A. [Member] Other risk Other Risk [Member] Other Risk Disclosure of financial assets [line items] Disclosure of financial assets [line items] Investment, Name [Axis] Investment, Name [Axis] Impairment loss recognised in profit or loss Less: Impairment of interest in BoCom Impairment loss recognised in profit or loss Proportion of ownership interest in subsidiary Proportion of ownership interest in subsidiary Disposal of major subsidiary Disposal of major subsidiary [member] Consensus Central scenario allowance for ECL 100% consensus Central scenario Central Scenario [Member] Central Scenario Number of employees Number Of Current And Former Employees Number Of Current And Former Employees Price Prices, Measurement Input [Member] Prices, Measurement Input Entity Registrant Name Entity Registrant Name Basic earnings per ordinary share (in dollars per share) Basic, amount per share (in dollars per share) Basic earnings (loss) per share Elimination of exchange differences Adjustments for unrealised foreign exchange losses (gains) Measurement [axis] Measurement [axis] Diluted, number of shares (in shares) Weighted average number of ordinary shares used in calculating diluted earnings per share Mortgages Mortgages [member] Subordinated loan capital repaid Repayments of subordinated liabilities Expected credit losses as a percentage of customer advances in the long term Description Of Expected Credit Losses As Percentage Of Customer Advances In Future Estimate Of Value In Use Description Of Expected Credit Losses As Percentage Of Customer Advances In Future Estimate Of Value In Use – treasury and other eligible bills Treasury And Other Eligible Bills [Member] Treasury And Other Eligible Bills [Member] Disclosure of associates [table] Disclosure of associates [table] Other financial assets measured at amortised cost Other Financial Assets [Member] Other Financial Assets [Member] Share-based payment expense Adjustments for share-based payments 1 to 29 DPD One To Twenty-Nine Days Past Due [Member] One To Twenty-Nine Days Past Due [Member] Changes due to modifications not derecognised Increase (Decrease) Through Changes To Risk Parameters, Modifications Not Derecognised, Financial Assets Increase (Decrease) Through Changes To Risk Parameters, Modifications Not Derecognised, Financial Assets Guarantees and other contingent liabilities: Estimated financial effect of contingent liabilities Estimated financial effect of contingent liabilities Wholesale Wholesale Lending Sector [Member] Wholesale Lending Sector [Member] Transfers Increase (Decrease) Through Transfer Between Merger Reserve And Retained Earnings, Equity Increase (Decrease) Through Transfer Between Merger Reserve And Retained Earnings, Equity Types of financial assets [axis] Types of financial assets [axis] Non-controlling interests Non-controlling interests Debt securities in issue – debt securities Debt instruments measured at FVOCI Debt securities [member] Customer accounts Customer Accounts [Member] Customer Accounts [Member] – fair value gains/(losses) Gains (losses) on financial assets measured at fair value through other comprehensive income, before tax Segment consolidation items [axis] Segment consolidation items [axis] Unrealised gains or losses recognised in profit or loss relating to assets held at end of period Gains (losses) recognised in profit or loss attributable to change in unrealised gains or losses for assets held at end of period, fair value measurement Depreciation, amortisation and impairment Adjustments for depreciation and amortisation expense and impairment loss (reversal of impairment loss) recognised in profit or loss – non-controlling interests Profit (loss), attributable to non-controlling interests – non-bank financial institutions Non-Bank Financial Institutions Loans Sector [Member] Non-Bank Financial Institutions Loans Sector [Member] Equity Equity [abstract] Private equity including strategic investments Other equity securities [member] foreign exchange options Other Derivative Liabilities, Foreign Exchange Options [Member] Other Derivative Liabilities, Foreign Exchange Options [Member] Disclosure of fair value measurement of assets Fair values of financial instruments not carried at fair value and bases of valuation - assets Disclosure of fair value measurement of assets [text block] Prepayment rate Constant prepayment rate, measurement input [member] HSBC Holdings HSBC Holdings [Member] HSBC Holdings [Member] Summary of net fee income Disclosure Of Major Components Of Net Fee And Commission Income (Expense) [Table Text Block] Disclosure Of Major Components Of Net Fee Income [Table Text Block] ECL Economic Scenario [Axis] ECL Economic Scenario [Axis] ECL Economic Scenario Increase (decrease) in financial assets [abstract] Increase (decrease) in financial assets [abstract] Debt instruments at fair value through other comprehensive income Other comprehensive income, net of tax, financial assets measured at fair value through other comprehensive income Second interim dividend Second Interim Dividend, 2026 [Member] Second Interim Dividend, 2026 – transfers from stage 3 Increase (Decrease) Through Transfers, Financial Assets, Transfers Out From Stage 3 Increase (Decrease) Through Transfers, Financial Assets, Transfers Out From Stage 3 Financial investments Financial investments measured at fair value through other comprehensive income Financial assets at fair value through other comprehensive income, category [member] Disclosure of other provisions rollforward Disclosure of other provisions [text block] Disclosure of significant unobservable inputs used in fair value measurement of liabilities Disclosure of significant unobservable inputs used in fair value measurement of liabilities [text block] Net income from assets and liabilities of insurance businesses, including related derivatives, measured at fair value through profit or loss Increase (decrease) through insurance revenue, insurance contracts liability (asset) Disaggregation of insurance contracts [member] Disaggregation of insurance contracts [domain] Banks, sovereigns, government entities and low-risk counterparties Banks, Sovereigns And Government Entities [Member] Banks, Sovereigns And Government Entities FX volatility Foreign Exchange Volatility, Measurement Input [Member] Foreign Exchange Volatility, Measurement Input [Member] HSBC Bank USA, N.A. HSBC Bank USA, N.A. [Member] HSBC Bank USA, N.A. [Member] Restructuring costs Restructuring provision [member] Change in expected credit losses and other credit impairment charges ECL Impairment Loss (Reversal Of Impairment Loss) Recognised In Profit Or Loss, Loans Impairment Charges And Other Risk Provisions Impairment Loss (Reversal Of Impairment Loss) Recognised In Profit Or Loss, Loans Impairment Charges And Other Risk Provisions Corporate lending adjustments Corporate Lending Adjustments [Member] Corporate Lending Adjustments Total liabilities Liabilities Liabilities Deposits by banks Deposits By Banks [Member] Deposits By Banks [Member] Cash and cash equivalents classified as part of disposal group held for sale Cash and cash equivalents classified as part of disposal group held for sale HSBC Argentina Holdings S.A. HSBC Argentina Holdings S.A. [Member] HSBC Argentina Holdings S.A. Total management judgemental adjustments (B) Management Judgemental Adjustments [Member] Management Judgemental Adjustments Deposits by banks Deposits from banks Net cash outflow on acquisition/disposal of subsidiaries, businesses, associates and joint ventures Payments For Investment In /Disposal Of Subsidiaries, Businesses, Associates, And Joint Ventures Payments For Investment In /Disposal Of Subsidiaries, Businesses, Associates, And Joint Ventures Net operating income Net Operating Income Net Operating Income – financial guarantees Financial guarantees Financial guarantee contracts [member] Customer accounts Deposits from customers Type of measurement of expected credit losses [domain] Type of measurement of expected credit losses [domain] Other derivatives Other Derivatives, Liabilities [Member] Other Derivatives, Liabilities [Member] – fair value gains/(losses) Other comprehensive income, before tax, gains (losses) from investments in equity instruments Non-adjusting events after reporting period [axis] Non-adjusting events after reporting period [axis] Assets held for sale Assets held for sale Non-current assets or disposal groups classified as held for sale Continuing operations, unless line item indicates otherwise Continuing operations, unless line item indicates otherwise [member] Standards applied during the half-year to 30 June 2026 Disclosure of initial application of standards or interpretations [text block] Valuation techniques used in fair value measurement [domain] Valuation techniques used in fair value measurement [domain] Items of contingent liabilities [domain] Items of contingent liabilities [domain] Maximum Top of range [member] Settlements Settlements, fair value measurement, liabilities Scenario [Axis] Scenario [Axis] Settlements Settlements, fair value measurement, assets Additional information about insurance contracts Additional information about insurance contracts [text block] Disposals, wind-downs, acquisitions and related costs Operating Expenses From Disposals, Wind Downs, Acquisitions, And Related Costs Operating Expenses From Disposals, Wind Downs, Acquisitions, And Related Costs Legal proceedings and regulatory matters Legal proceedings provision [member] 2029 Later than three years and not later than four years [member] Remeasurement of defined benefit (liability)/asset – remeasurement of defined benefit asset/(liability) Other comprehensive income, net of tax, gains (losses) on remeasurements of defined benefit plans Decrease in allowance for ECL Increase (Decrease) In Financial Assets Included In Sensitivity Analysis Increase (Decrease) In Financial Assets Included In Sensitivity Analysis Income Statement Location [Domain] Income Statement Location1 [Domain] [Domain] for Income Statement Location1 [Axis] Types Of Market Risk Portfolios [Domain] Types Of Market Risk Portfolios [Domain] Types Of Market Risk Portfolios [Domain] – other equity holders Profit (Loss) Attributable To Other Equity Holders Of Parent Entity Profit (Loss) Attributable To Other Equity Holders Of Parent Entity Loans and advances to banks Loans and advances to banks at amortised cost Loans And Advances To Banks [Member] Loans And Advances To Banks [Member] Additional tier 1 capital before regulatory adjustments Additional Tier One Capital, Before Regulatory Adjustments Additional Tier One Capital, Before Regulatory Adjustments Assets and liabilities classified as held for sale [axis] Assets and liabilities classified as held for sale [axis] Non-trading reverse purchase agreement commitments Reverse Repurchase Agreement, Non-trading [Member] Reverse Repurchase Agreement, Non-trading [Member] Carrying amount, accumulated depreciation, amortisation and impairment and gross carrying amount [axis] Carrying amount, accumulated depreciation, amortisation and impairment and gross carrying amount [axis] HSBC Bank Egypt S.A.E. HSBC Bank Egypt S.A.E. [Member] HSBC Bank Egypt S.A.E. Saudi Awwal Bank Saudi Awwal Bank [Member] The Saudi British Bank [Member] Foreign exchange Foreign exchange and commodity Currency risk [member] Net new and further lending/ repayments Increase (Decrease) Through Origination Or Purchase (Repayments), Financial Assets Increase (Decrease) Through Origination Or Purchase (Repayments), Financial Assets Deferred tax liabilities Deferred tax liabilities Geographical [Axis] Geographical [Axis] – other Other Derivative Liabilities, Miscellaneous [Member] Other Derivatives Liabilities, Miscellaneous [Member] Tax paid Income taxes paid (refund), classified as operating activities Other comprehensive income/(expense) for the period, net of tax Other comprehensive income Trading portfolios Trading Portfolios [Member] Trading Portfolios [Member] Transfers out Transfers out of Level 3 of fair value hierarchy, assets Past due status [member] Past due status [domain] Net decrease in cash and cash equivalents Increase (decrease) in cash and cash equivalents before effect of exchange rate changes Disclosure of funding sources and uses Disclosure Of Funding Sources And Uses [Table Text Block] Disclosure Of Funding Sources And Uses [Table Text Block] Forecast Forecast [Member] Disclosure of fair value measurement of liabilities Fair values of financial instruments not carried at fair value and bases of valuation - liabilities Disclosure of fair value measurement of liabilities [text block] Capital securities issued Issue of equity Corporate Centre Corporate Centre [Member] Corporate Centre [Member] Industry Sector 1 [Domain] Industry Sector 1 [Domain] [Domain] for Industry Sector 1 [Axis] – debt instruments at fair value through other comprehensive income Other Comprehensive Income, Net Of Tax, Financial Assets Measured At Fair Value Through Other Comprehensive Income, Excluding Disposal Of Subsidiary Other Comprehensive Income, Net Of Tax, Financial Assets Measured At Fair Value Through Other Comprehensive Income, Excluding Disposal Of Subsidiary Net cash inflow on acquisition/disposal of subsidiaries, businesses, associates and joint ventures Cash Inflow From Acquisition/Disposal Of Subsidiaries, Businesses, Associates, And Joint Ventures Cash Inflow From Acquisition/Disposal Of Subsidiaries, Businesses, Associates, And Joint Ventures Insurance contracts, other insurance contracts Insurance contracts, other insurance contracts [Member] Insurance contracts, other insurance contracts Good Good [Member] Good [Member] Subsidiaries [domain] Subsidiaries [domain] Other provisions Miscellaneous other provisions [member] Accruals, deferred income and other liabilities Accruals, Deferred Income And Other Liabilities Accruals, Deferred Income And Other Liabilities Reconciliation of reported and adjusted items Disclosure Of Reconciliation Of Reported Amounts To Adjusted Amounts [Table Text Block] Disclosure Of Reconciliation Of Reported Amounts To Adjusted Amounts [Table Text Block] Benchmark rate litigation Benchmark Rate Litigation [Member] Benchmark Rate Litigation [Member] Disclosure of detailed information about hedging instruments [table] Disclosure of detailed information about hedging instruments [table] Allowance for ECL Accumulated impairment [member] Credit facilities Credit-related fee and commission income Contingent liabilities, contractual commitments and guarantees Disclosure of commitments and contingent liabilities [text block] Financial investments Disclosure of financial instruments [text block] Liabilities under investment contracts designated at fair value Investment Contracts Liabilities At Fair Value Investment Contracts Liabilities At Fair Value Fair value of hedging assets Hedging instrument, assets Net cash from investing activities Cash flows from (used in) investing activities Reinsurance contract assets Reinsurance contracts held that are assets HSBC Insurance (Asia-Pacific) Holdings Limited HSBC Insurance (Asia-Pacific) Holdings Limited [Member] HSBC Insurance (Asia-Pacific) Holdings Limited Derivatives Disclosure of derivative financial instruments [text block] UK Life Insurance Business UK Life Insurance Business [Member] UK Life Insurance Business – changes in fair value of other financial instruments mandatorily measured at fair value through profit or loss Changes In Fair Value Of Other Financial Instruments Mandatorily Measured At Fair Value Through Profit Or Loss [Member] Changes In Fair Value Of Other Financial Instruments Mandatorily Measured At Fair Value Through Profit Or Loss [Member] New IFRSs [domain] New IFRSs [domain] Share of HSBC’s constant currency profit/(loss) before tax Percentage Of Entity's Adjusted Profit (Loss) Before Tax Percentage Of Entity's Adjusted Profit (Loss) Before Tax Consensus Downside scenario allowance for ECL 100% consensus Downside scenario Downside Scenario , Worst Outcome [Member] Downside Scenario , Worst Outcome Employee compensation and benefits Employee benefits expense Stage 2 Lifetime expected credit losses [member] – other instruments Other Financial Instruments [Member] Other Financial Instruments [Member] Share of profit in associates and joint ventures less impairment Share Of Profit (Loss) Of Associates And Joint Ventures Accounted For Using Equity Method, Less Impairment Share Of Profit (Loss) Of Associates And Joint Ventures Accounted For Using Equity Method, Less Impairment Commitments Contractual capital commitments Interests In Other Entities [Abstract] Interests In Other Entities [Abstract] Interests In Other Entities [Abstract] Disclosure of operating segments [table] Disclosure of operating segments [table] Germany Custody Business German Custody Business [Member] German Custody Business PT Bank HSBC Indonesia PT Bank HSBC Indonesia [Member] PT Bank HSBC Indonesia Total gains or losses recognised in profit or loss Gains (losses) recognised in profit or loss including exchange differences, fair value measurement, liabilities Equities Equity Equity price risk [member] Gross total fair values of derivative liabilities Gross Derivative Financial Liabilities, Including Not Subject to Enforceable Master Netting Arrangements Gross Derivative Financial Liabilities, Including Not Subject to Enforceable Master Netting Arrangements French Retained Home And Other Loan Portfolio French Retained Home And Other Loan Portfolio [Member] French Retained Home And Other Loan Portfolio $1,250m 7.000% Perpetual Subordinated Contingent Convertible Securities $1,250m 7.000% Perpetual Subordinated Contingent Convertible Securities [Member] $1,250m 7.000% Perpetual Subordinated Contingent Convertible Securities Segments [axis] Segments [axis] Types of risks [axis] Types of risks [axis] Employees involved in litigation Number Of Employees Involved In Litigation Number Of Employees Involved In Litigation GDP (annual average growth rate, %) GDP level (%, start-to-peak) GDP level (%, start-to-trough) Inputs, Assumptions And Estimation Techniques Used To Determine Expected Credit Losses, GDP Growth Rate Inputs, Assumptions And Estimation Techniques Used To Determine Expected Credit Losses, GDP Growth Rate Other adjustments (C) Other Macroeconomic Related Adjustments [Member] Other Macroeconomic Related Adjustments Depreciation and impairment of property, plant and equipment and right-of-use assets Depreciation, property, plant and equipment Types of hedges [axis] Types of hedges [axis] Contingent liabilities dismissed Contingent Liabilities Dismissed Contingent Liabilities Dismissed Markets with lower uncertainty Number Of Markets With Lower Level Of Uncertainty Number Of Markets With Lower Level Of Uncertainty Debt instruments measured at amortised cost Financial assets at amortised cost, category Financial assets at amortised cost, category [member] Disclosure of non-adjusting events after reporting period [table] Disclosure of non-adjusting events after reporting period [table] Dividends [Axis] Dividends1 [Axis] Dividends1 [Axis] Inflation rate, 5 year average Inputs, Assumptions And Estimation Techniques Used To Determine Expected Credit Losses, Inflation Rate, Five Year Average Inputs, Assumptions And Estimation Techniques Used To Determine Expected Credit Losses, Inflation Rate, Five Year Average Amendment Flag Amendment Flag Total equity Components of equity [domain] Expense of restructuring activities Expense of restructuring activities Expense of restructuring activities – expected credit losses recognised in the income statement Amounts removed from equity and adjusted against fair value of financial assets on reclassification out of fair value through other comprehensive income measurement category, before tax Dividends to shareholders Dividends recognised as distributions to owners Dividends recognised as distributions to owners Disclosure of operating segments [line items] Disclosure of operating segments [line items] Reinsurance contract liabilities Reinsurance contracts held that are liabilities Average Weighted average [member] Hang Seng Bank Hang Seng Bank [Member] Hang Seng Bank Number of financial instrument categories Number Of Financial Instrument Categories Number Of Financial Instrument Categories Contractual commitments Provision for credit commitments [member] Insurance agency commission Insurance Agency Fee And Commission Income Insurance Agency Fee And Commission Income HSBC Bank plc HSBC Bank plc [Member] HSBC Bank plc [Member] – foreign exchange derivatives Foreign Exchange Derivative Liabilities [Member] Foreign Exchange Derivative Liabilities Current tax assets Current tax assets Net operating income before change in expected credit losses and other credit impairment charges Net operating income before change in expected credit losses and other credit impairment charges Net operating income Revenue Revenue and other operating income Amounts utilised Provision used, other provisions Range [domain] Range [domain] Classes of contingent liabilities [axis] Classes of contingent liabilities [axis] Currency translation Corporate And Reconciling Items [Member] Corporate And Reconciling Items – interest income Interest income Recurring fair value measurement Recurring fair value measurement [member] Disposal Group Name [Axis] Disposal Group Name [Axis] Disposal Group Name Scenario [Domain] Scenario [Domain] US Anti-Terrorism Act litigation US Anti-Terrorism Act litigation [Member] US Anti-Terrorism Act litigation Unit trusts Unit Trusts Fee And Commission Income Unit Trusts Fee And Commission Income ECL coverage % Expected credit loss rate Reported external net operating income by country Disclosure Of External Operating Income (Loss) By Geographical Areas [Table Text Block] Disclosure Of External Operating Income (Loss) By Geographical Areas [Table Text Block] Tier 1 capital adequacy ratio Description Of Tier 1 Capital Adequacy Ratio In Current Estimate Of Value In Use Description Of Tier 1 Capital Adequacy Ratio In Current Estimate Of Value In Use Issue of ordinary share capital and other equity instruments Proceeds From Issuing Shares And Other Equity Instruments Proceeds From Issuing Shares And Other Equity Instruments Types of customers [axis] Types of customers [axis] Additions Additional provisions, other provisions Notional amount Notional amount Cash 
flow
hedging
reserve Reserve of cash flow hedges [member] Korean short selling investigation Korean Short Selling Investigation [Member] Korean Short Selling Investigation total return swaps Return Swap Assets [Member] Return Swap Assets securitisation swaps Other Derivative Assets, Securitisation Swaps [Member] Other Derivative Assets, Securitisation Swaps [Member] Other Other fee and commission income Diluted earnings per ordinary share (in dollars per share) Diluted, amount per share (in dollars per share) Diluted earnings (loss) per share Maturity [domain] Maturity [domain] Categories of financial liabilities [axis] Categories of financial liabilities [axis] Modelled ECL (A) Excluding Management Judgemental Adjustments [Member] Excluding Management Judgemental Adjustments Credit impairment of financial instruments Credit impairment of financial instruments [domain] Disclosure of detailed information on earnings per share Earnings per share [text block] Counterparty Name [Axis] Counterparty Name [Axis] Disclosure of associates [line items] Disclosure of associates [line items] Model – Option model Option pricing model [member] Net investment in intangible assets Purchase of intangible assets, classified as investing activities House prices (annual average growth rate, %) House price index (%, start-to-peak) House price index (%, start-to-trough) Inputs, Assumptions And Estimation Techniques Used To Determine Expected Credit Losses, House Price Growth Inputs, Assumptions And Estimation Techniques Used To Determine Expected Credit Losses, House Price Growth Internal credit grades [axis] Internal credit grades [axis] – fair value losses/(gains) reclassified to the income statement Reclassification adjustments on cash flow hedges, before tax