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Financial Statements of HSBC USA Inc. (Parent) Balance Sheet (Phantom) (Details) - USD ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Condensed Financial Statements, Captions [Line Items]    
Securities held-to-maturity, fair value $ 13,902 $ 12,838
Long-term debt, maturities, 2018 8,548  
Long-term debt, maturities, 2019 5,103  
Long-term debt, maturities, 2020 6,994  
Long-term debt, maturities, 2021 3,599  
Long-term debt, maturities, 2022 1,647  
Long-term debt, maturities, Thereafter 9,075  
HSBC USA Inc [Member]    
Condensed Financial Statements, Captions [Line Items]    
Securities held-to-maturity, fair value 3 $ 3
Long-term debt, maturities, 2018 7,100  
Long-term debt, maturities, 2019 4,000  
Long-term debt, maturities, 2020 5,800  
Long-term debt, maturities, 2021 1,600  
Long-term debt, maturities, 2022 1,700  
Long-term debt, maturities, Thereafter $ 3,100