| Cover | May 25, 2021 |
| Entity Information [Line Items] | |
| Document Type | 8-K |
| Document Period End Date | May 25, 2021 |
| Entity File Number | 001-07436 |
| Entity Registrant Name | HSBC USA Inc. |
| Entity Incorporation, State or Country Code | MD |
| Entity Tax Identification Number | 13-2764867 |
| Entity Address, Address Line One | 452 Fifth Avenue |
| Entity Address, City or Town | New York |
| Entity Address, State or Province | NY |
| Entity Address, Postal Zip Code | 10018 |
| City Area Code | 212 |
| Local Phone Number | 525-5000 |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Entity Emerging Growth Company | false |
| Entity Central Index Key | 0000083246 |
| Amendment Flag | false |
| $100,000 Zero Coupon Callable Accreting Notes due January 15, 2043 [Member] | |
| Entity Information [Line Items] | |
| Title of 12(b) Security | $100,000,000 Zero Coupon Callable Accreting Notes due January 15, 2043 |
| Trading Symbol | HBA/43 |
| Security Exchange Name | NYSE |
| $50,000,000 Zero Coupon Callable Accreting Notes due January 29, 2043 [Member] | |
| Entity Information [Line Items] | |
| Title of 12(b) Security | $50,000,000 Zero Coupon Callable Accreting Notes due January 29, 2043 |
| Trading Symbol | HBA/43A |
| Security Exchange Name | NYSE |
