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Financial Statements of HSBC USA Inc. (Parent) Balance Sheet (Phantom) (Details) - USD ($)
$ in Millions
Dec. 31, 2021
Dec. 31, 2020
Condensed Financial Statements, Captions [Line Items]    
Fair Value $ 5,359 $ 9,369
2022 2,930  
2023 1,593  
2024 2,014  
2025 4,474  
2026 631  
Thereafter 5,594  
HSBC USA    
Condensed Financial Statements, Captions [Line Items]    
Securities held-to-maturity, allowance for credit losses 1 1
Fair Value 1 $ 2
2022 2,900  
2023 1,600  
2024 2,000  
2025 4,500  
2026 600  
Thereafter $ 2,500