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Loans - Schedule of Additional Information on Nonaccrual Loans (Details) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Receivables [Abstract]      
Residential Mortgage Loan Nonaccrual Carried At Lower Of Amortized Cost Or Fair Value Less Cost To Sell $ 817hsbcusa_ResidentialMortgageLoanNonaccrualCarriedAtLowerOfAmortizedCostOrFairValueLessCostToSell $ 841hsbcusa_ResidentialMortgageLoanNonaccrualCarriedAtLowerOfAmortizedCostOrFairValueLessCostToSell  
Interest income that would have been recorded if the nonaccrual receivable had been current in accordance with contractual terms during the period 96hsbcusa_LoansandLeasesReceivableImpairedInterestRecordedandInterestLostonNonaccrualLoans 107hsbcusa_LoansandLeasesReceivableImpairedInterestRecordedandInterestLostonNonaccrualLoans 125hsbcusa_LoansandLeasesReceivableImpairedInterestRecordedandInterestLostonNonaccrualLoans
Interest income that was recorded on nonaccrual loans and included in interest income during the period $ 23hsbcusa_InterestIncomeRecordedonNonaccrualReceivables $ 23hsbcusa_InterestIncomeRecordedonNonaccrualReceivables $ 13hsbcusa_InterestIncomeRecordedonNonaccrualReceivables