XML 126 R1.htm IDEA: XBRL DOCUMENT v3.19.3.a.u2
Document and Entity Information - USD ($)
12 Months Ended
Dec. 31, 2019
Feb. 14, 2020
Jun. 30, 2019
Entity Information [Line Items]      
Document Type 10-K    
Amendment Flag false    
Document Period End Date Dec. 31, 2019    
Document Fiscal Year Focus 2019    
Document Fiscal Period Focus FY    
Entity Registrant Name HSBC USA INC /MD/    
Entity Central Index Key 0000083246    
Current Fiscal Year End Date --12-31    
Entity Filer Category Non-accelerated Filer    
Entity Common Stock, Shares Outstanding   714  
Entity Well-known Seasoned Issuer Yes    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Public Float     $ 0
Entity Emerging Growth Company false    
Entity Small Business false    
Entity Shell Company false    
Zero Coupon Callable Accreting Notes due January 15, 2043 [Member]      
Entity Information [Line Items]      
Trading Symbol HBA/43    
Zero Coupon Callable Accreting Notes due January 29, 2043 [Member]      
Entity Information [Line Items]      
Trading Symbol HBA/43A