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Financial Statements of HSBC USA Inc. (Parent) Balance Sheet (Phantom) (Details) - USD ($)
$ in Millions
Dec. 31, 2023
Dec. 31, 2022
Condensed Financial Statements, Captions [Line Items]    
Securities held-to-maturity, fair value $ 14,689 $ 6,862
2024 4,710  
2025 6,329  
2026 1,124  
2027 894  
2028 1,225  
Thereafter 4,379  
HSBC USA    
Condensed Financial Statements, Captions [Line Items]    
Securities held-to-maturity, fair value 1 $ 1
2024 4,700  
2025 6,300  
2026 1,100  
2027 800  
2028 900  
Thereafter $ 1,900