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Financial Statements of HSBC USA Inc. (Parent) Balance Sheet (Phantom) (Details) - USD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Condensed Financial Statements, Captions [Line Items]    
Securities held-to-maturity, fair value $ 13,431 $ 14,443
Long-term debt, maturities, 2020 7,259  
Long-term debt, maturities, 2021 6,025  
Long-term debt, maturities, 2022 2,230  
Long-term debt, maturities, 2023 1,150  
Long-term debt, maturities, 2024 1,484  
Long-term debt, maturities, Thereafter 8,549  
HSBC USA Inc [Member]    
Condensed Financial Statements, Captions [Line Items]    
Securities held-to-maturity, fair value 2 $ 2
Long-term debt, maturities, 2020 6,000  
Long-term debt, maturities, 2021 2,500  
Long-term debt, maturities, 2022 2,200  
Long-term debt, maturities, 2023 1,100  
Long-term debt, maturities, 2024 1,500  
Long-term debt, maturities, Thereafter $ 4,100