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Financial Statements of HSBC USA Inc. (Parent) Balance Sheet (Phantom) (Details) - USD ($)
$ in Millions
Dec. 31, 2015
Dec. 31, 2014
Condensed Financial Statements, Captions [Line Items]    
Held-to-maturity Securities, Fair Value $ 14,165 $ 13,695
2016 2,877  
2017 5,597  
2018 8,860  
2019 2,789  
2020 6,471  
Thereafter 6,915  
HSBC USA Inc [Member]    
Condensed Financial Statements, Captions [Line Items]    
Held-to-maturity Securities, Fair Value 4 $ 4
2016 2,900  
2017 3,300  
2018 6,000  
2019 2,800  
2020 5,200  
Thereafter $ 3,000