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Financial Statements of HSBC USA Inc. (Parent) Balance Sheet (Phantom) (Details) - USD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Condensed Financial Statements, Captions [Line Items]    
Securities held-to-maturity, fair value $ 14,443 $ 13,902
Long-term debt, maturities, 2019 5,799  
Long-term debt, maturities, 2020 6,934  
Long-term debt, maturities, 2021 5,495  
Long-term debt, maturities, 2022 1,342  
Long-term debt, maturities, 2023 981  
Long-term debt, maturities, Thereafter 10,077  
HSBC USA Inc [Member]    
Condensed Financial Statements, Captions [Line Items]    
Securities held-to-maturity, fair value 2 $ 3
Long-term debt, maturities, 2019 4,100  
Long-term debt, maturities, 2020 5,800  
Long-term debt, maturities, 2021 2,000  
Long-term debt, maturities, 2022 1,300  
Long-term debt, maturities, 2023 1,000  
Long-term debt, maturities, Thereafter $ 4,700