2.4.0.82403402 - Disclosure - Discontinued Operations - Additional Information (Detail)truefalseIn Millions, unless otherwise specifiedfalse1false USDfalsefalse$I2013Q2http://www.sec.gov/CIK0000354964instant2013-06-30T00:00:000001-01-01T00:00:00usdStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$2false USDfalsefalse$I2012Q4http://www.sec.gov/CIK0000354964instant2012-12-31T00:00:000001-01-01T00:00:00usdStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$3false USDtruefalse$D2013Q1March_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis_hsbcfc_InsuranceBusinessMemberhttp://www.sec.gov/CIK0000354964duration2013-03-28T00:00:002013-03-29T00:00:00falsefalseInsurance businessus-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxisxbrldihttp://xbrl.org/2006/xbrldihsbcfc_InsuranceBusinessMemberus-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxisexplicitMemberusdStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$4false USDtruefalse$D2012Q4YTD_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis_hsbcfc_InsuranceBusinessMemberhttp://www.sec.gov/CIK0000354964duration2012-01-01T00:00:002012-12-31T00:00:00falsefalseInsurance businessus-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxisxbrldihttp://xbrl.org/2006/xbrldihsbcfc_InsuranceBusinessMemberus-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxisexplicitMemberusdStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$5false USDtruefalse$D2012Q2_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis_hsbcfc_CardAndRetailServicesMemberhttp://www.sec.gov/CIK0000354964duration2012-04-01T00:00:002012-06-30T00:00:00falsefalseCard and Retail Servicesus-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxisxbrldihttp://xbrl.org/2006/xbrldihsbcfc_CardAndRetailServicesMemberus-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxisexplicitMemberusdStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$6false truefalseI2012Q2May02_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis_hsbcfc_CardAndRetailServicesMemberhttp://www.sec.gov/CIK0000354964instant2012-05-02T00:00:000001-01-01T00:00:00falsefalseCard and Retail Servicesus-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxisxbrldihttp://xbrl.org/2006/xbrldihsbcfc_CardAndRetailServicesMemberus-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxisexplicitMembernumberStandardhttp://www.xbrl.org/2003/instancepurexbrli07false USDtruefalse$D2013Q2YTD_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis_hsbcfc_CardAndRetailServicesMember_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_hsbcfc_HsbcUsaIncMemberhttp://www.sec.gov/CIK0000354964duration2013-01-01T00:00:002013-06-30T00:00:00falsefalseCard and Retail Servicesus-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxisxbrldihttp://xbrl.org/2006/xbrldihsbcfc_CardAndRetailServicesMemberus-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxisexplicitMemberfalsefalseHSBC USA, Inc. [Member]us-gaap_RelatedPartyTransactionsByRelatedPartyAxisxbrldihttp://xbrl.org/2006/xbrldihsbcfc_HsbcUsaIncMemberus-gaap_RelatedPartyTransactionsByRelatedPartyAxisexplicitMemberusdStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$8false USDtruefalse$D2012Q2YTD_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis_hsbcfc_CardAndRetailServicesMember_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_hsbcfc_HsbcUsaIncMemberhttp://www.sec.gov/CIK0000354964duration2012-01-01T00:00:002012-06-30T00:00:00falsefalseCard and Retail Servicesus-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxisxbrldihttp://xbrl.org/2006/xbrldihsbcfc_CardAndRetailServicesMemberus-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxisexplicitMemberfalsefalseHSBC USA, Inc. [Member]us-gaap_RelatedPartyTransactionsByRelatedPartyAxisxbrldihttp://xbrl.org/2006/xbrldihsbcfc_HsbcUsaIncMemberus-gaap_RelatedPartyTransactionsByRelatedPartyAxisexplicitMemberusdStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$1true 3us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsLineItemsus-gaap_truenadurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalse3falsefalsefalse00falsefalsefalse4falsefalsefalse00falsefalsefalse5falsefalsefalse00falsefalsefalse6falsefalsefalse00falsefalsefalse7falsefalsefalse00falsefalsefalse8falsefalsefalse00falsefalsefalsexbrli:stringItemTypestringfalse0Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]2false 4us-gaap_ProceedsFromDivestitureOfBusinessesus-gaap_truedebitdurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalse3truefalsefalse153000000153USD$falsetruefalse4falsefalsefalse00falsefalsefalse5truefalsefalse1180000000011800USD$falsetruefalse6falsefalsefalse00falsefalsefalse7falsefalsefalse00falsefalsefalse8falsefalsefalse00falsefalsefalsexbrli:monetaryItemTypemonetaryThe cash inflow associated with the amount received from the sale of a portion of the company's business, for example a segment, division, branch or other business, during the period.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3179-108585 false2Proceeds from divestiture of businesses3false 4us-gaap_DiscontinuedOperationGainLossFromDisposalOfDiscontinuedOperationBeforeIncomeTaxus-gaap_truecreditdurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalse3truefalsefalse2100000021falsefalsefalse4falsefalsefalse00falsefalsefalse5truefalsefalse22000000002200falsefalsefalse6falsefalsefalse00falsefalsefalse7falsefalsefalse00falsefalsefalse8falsefalsefalse00falsefalsefalsexbrli:monetaryItemTypemonetaryAmount of gain (loss), before tax expense or benefit and not previously recognized, resulting from the sale of a business component.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6892542&loc=d3e957-107759 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6360339&loc=d3e1361-107760 false2Pre-tax gain4false 4us-gaap_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTaxus-gaap_truecreditdurationfalsefalsefalsefalsefalsefalsefalsefalseverboseLabel1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalse3truefalsefalse1300000013falsefalsefalse4falsefalsefalse00falsefalsefalse5truefalsefalse14000000001400falsefalsefalse6falsefalsefalse00falsefalsefalse7falsefalsefalse00falsefalsefalse8falsefalsefalse00falsefalsefalsexbrli:monetaryItemTypemonetaryAmount of gain (loss), after tax expense or benefit and not previously recognized, resulting from the sale of a business component.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6892542&loc=d3e957-107759 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6360339&loc=d3e1361-107760 false2After-tax gain5false 4hsbcfc_LowerOfCostOrFairValueAdjustmentOnDisposalGroupDiscontinuedOperationsBeforeTaxhsbcfc_falsecreditdurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalse3falsefalsefalse00falsefalsefalse4truefalsefalse119000000119falsefalsefalse5falsefalsefalse00falsefalsefalse6falsefalsefalse00falsefalsefalse7falsefalsefalse00falsefalsefalse8falsefalsefalse00falsefalsefalsexbrli:monetaryItemTypemonetaryLower of Cost or Fair Value Adjustment on Disposal Group, Discontinued Operations, Before TaxNo definition available.false2Lower of amortized cost or fair value less cost to sell adjustment, before tax6false 4hsbcfc_LowerOfCostOrFairValueAdjustmentOnDisposalGroupDiscontinuedOperationsAfterTaxhsbcfc_falsecreditdurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalse3falsefalsefalse00falsefalsefalse4truefalsefalse9000000090falsefalsefalse5falsefalsefalse00falsefalsefalse6falsefalsefalse00falsefalsefalse7falsefalsefalse00falsefalsefalse8falsefalsefalse00falsefalsefalsexbrli:monetaryItemTypemonetaryLower of Cost or Fair Value Adjustment on Disposal Group, Discontinued Operations, After TaxNo definition available.false2Lower of amortized cost or fair value less cost to sell adjustment, after tax7false 4hsbcfc_PremiumPercentageOfDisposalGroupAtWhichReceivablesBeenSoldhsbcfc_falsenainstantfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1falsetruefalse00falsefalsefalse2falsetruefalse00falsefalsefalse3falsetruefalse00falsefalsefalse4falsetruefalse00falsefalsefalse5falsetruefalse00falsefalsefalse6truetruefalse0.08750.0875falsefalsefalse7falsetruefalse00falsefalsefalse8falsetruefalse00falsefalsefalsenum:percentItemTypepurePremium percentage of disposal group at which receivables been sold.No definition available.false0Sold business, premium percentage of receivables8false 4hsbcfc_DisposalGroupIncludingDiscontinuedOperationGainOnSaleOfAccountRelationshipshsbcfc_falsecreditdurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalse3falsefalsefalse00falsefalsefalse4falsefalsefalse00falsefalsefalse5falsefalsefalse00falsefalsefalse6falsefalsefalse00falsefalsefalse7falsefalsefalse00falsefalsefalse8truefalsefalse7900000079falsefalsefalsexbrli:monetaryItemTypemonetaryDiscontinued operation gain on sale of account relationships.No definition available.false2Gain on sale of intangible assets9false 4hsbcfc_DisposalGroupIncludingDiscontinuedOperationOtherLiabilitiesIndustryReviewEnhancementServicesProductsAdditionalExpensehsbcfc_falsedebitdurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalse3falsefalsefalse00falsefalsefalse4falsefalsefalse00falsefalsefalse5falsefalsefalse00falsefalsefalse6falsefalsefalse00falsefalsefalse7truefalsefalse100000000100falsefalsefalse8falsefalsefalse00falsefalsefalsexbrli:monetaryItemTypemonetaryDisposal Group, Including Discontinued Operation, Other Liabilities, Industry Review, Enhancement Services Products, Additional ExpenseNo definition available.false2Incremental increase in industry review enhancement expense10false 4hsbcfc_DisposalGroupIncludingDiscontinuedOperationProvisionforLegalExpensesandOtherhsbcfc_falsedebitdurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalse3falsefalsefalse00falsefalsefalse4falsefalsefalse00falsefalsefalse5falsefalsefalse00falsefalsefalse6falsefalsefalse00falsefalsefalse7truefalsefalse4000000040falsefalsefalse8falsefalsefalse00falsefalsefalsexbrli:monetaryItemTypemonetaryDisposal Group, Including Discontinued Operation, Provision for Legal Expenses and OtherNo definition available.false2Provision for legal expenses and other11false 4hsbcfc_DisposalGroupIncludingDiscontinuedOperationOtherLiabilitiesIndustryReviewEnhancementServicesProductshsbcfc_falsecreditinstantfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1truefalsefalse158000000158USD$falsetruefalse2truefalsefalse5900000059USD$falsetruefalse3falsefalsefalse00falsefalsefalse4falsefalsefalse00falsefalsefalse5falsefalsefalse00falsefalsefalse6falsefalsefalse00falsefalsefalse7falsefalsefalse00falsefalsefalse8falsefalsefalse00falsefalsefalsexbrli:monetaryItemTypemonetaryDisposal Group, Including Discontinued Operation, Other Liabilities, Industry Review, Enhancement Services ProductsNo definition available.false2Other Liabilities for enhancement services productsfalseDiscontinued Operations - Additional Information (Detail) (USD $)MillionsUnKnownUnKnownUnKnowntruefalsefalseSheethttp://www.us.hsbc.com/role/DiscontinuedOperationsAdditionalInformationDetail811