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Long-Term Debt-Schedule (Details) - USD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Debt Instrument [Line Items]    
Long-term debt $ 26,697 $ 30,628
HSBC USA Inc [Member]    
Debt Instrument [Line Items]    
Long-term debt 17,443 18,863
Mark-to-market adjustment on fair value option debt 1,195 (243)
HSBC Bank USA and its Subsidiaries [Member]    
Debt Instrument [Line Items]    
Long-term debt 9,254 11,765
Mark-to-market adjustment on fair value option debt 224 196
Senior debt [Member] | HSBC USA Inc [Member]    
Debt Instrument [Line Items]    
Long-term debt 14,226 17,086
Senior debt [Member] | HSBC Bank USA and its Subsidiaries [Member]    
Debt Instrument [Line Items]    
Long-term debt 6,345 7,827
Senior debt [Member] | Fixed Rate Notes [Member] | HSBC USA Inc [Member]    
Debt Instrument [Line Items]    
Long-term debt $ 6,231 7,886
Interest rate, weighted average 3.20%  
Senior debt [Member] | Fixed Rate Notes [Member] | HSBC USA Inc [Member] | Minimum [Member]    
Debt Instrument [Line Items]    
Interest rate, fixed 2.35%  
Senior debt [Member] | Fixed Rate Notes [Member] | HSBC USA Inc [Member] | Maximum [Member]    
Debt Instrument [Line Items]    
Interest rate, fixed 4.20%  
Senior debt [Member] | Fixed Rate Notes [Member] | HSBC Bank USA and its Subsidiaries [Member]    
Debt Instrument [Line Items]    
Long-term debt $ 5,124 4,927
Interest rate, weighted average 3.89%  
Senior debt [Member] | Fixed Rate Notes [Member] | HSBC Bank USA and its Subsidiaries [Member] | Minimum [Member]    
Debt Instrument [Line Items]    
Interest rate, fixed 3.67%  
Senior debt [Member] | Fixed Rate Notes [Member] | HSBC Bank USA and its Subsidiaries [Member] | Maximum [Member]    
Debt Instrument [Line Items]    
Interest rate, fixed 4.37%  
Senior debt [Member] | Floating Rate Notes [Member] | HSBC USA Inc [Member]    
Debt Instrument [Line Items]    
Long-term debt $ 0 350
Senior debt [Member] | Floating Rate Notes [Member] | HSBC Bank USA and its Subsidiaries [Member]    
Debt Instrument [Line Items]    
Long-term debt $ 29 31
Interest rate, weighted average 1.73%  
Senior debt [Member] | Floating Rate Notes [Member] | HSBC Bank USA and its Subsidiaries [Member] | Minimum [Member]    
Debt Instrument [Line Items]    
Interest rate, floating 1.71%  
Senior debt [Member] | Floating Rate Notes [Member] | HSBC Bank USA and its Subsidiaries [Member] | Maximum [Member]    
Debt Instrument [Line Items]    
Interest rate, floating 1.88%  
Senior debt [Member] | Structured Notes [Member] | HSBC USA Inc [Member]    
Debt Instrument [Line Items]    
Long-term debt $ 7,995 8,850
Interest rate, weighted average 2.49%  
Senior debt [Member] | Structured Notes [Member] | HSBC USA Inc [Member] | Minimum [Member]    
Debt Instrument [Line Items]    
Interest rate, floating 1.74%  
Senior debt [Member] | Structured Notes [Member] | HSBC USA Inc [Member] | Maximum [Member]    
Debt Instrument [Line Items]    
Interest rate, floating 4.21%  
Senior debt [Member] | Structured Notes [Member] | HSBC Bank USA and its Subsidiaries [Member]    
Debt Instrument [Line Items]    
Long-term debt $ 192 769
Interest rate, weighted average 2.93%  
Senior debt [Member] | Structured Notes [Member] | HSBC Bank USA and its Subsidiaries [Member] | Minimum [Member]    
Debt Instrument [Line Items]    
Interest rate, floating 1.76%  
Senior debt [Member] | Structured Notes [Member] | HSBC Bank USA and its Subsidiaries [Member] | Maximum [Member]    
Debt Instrument [Line Items]    
Interest rate, floating 3.04%  
Senior debt [Member] | FHLB Advances - Floating Rate [Member] | HSBC Bank USA and its Subsidiaries [Member]    
Debt Instrument [Line Items]    
Long-term debt $ 1,000 2,100
Interest rate, weighted average 1.97%  
Interest rate, floating 1.97%  
Subordinated Debt [Member] | HSBC USA Inc [Member]    
Debt Instrument [Line Items]    
Long-term debt $ 2,022 2,020
Subordinated Debt [Member] | Fixed Rate Notes [Member] | HSBC USA Inc [Member]    
Debt Instrument [Line Items]    
Long-term debt $ 1,172 1,170
Interest rate, weighted average 6.16%  
Subordinated Debt [Member] | Fixed Rate Notes [Member] | HSBC USA Inc [Member] | Minimum [Member]    
Debt Instrument [Line Items]    
Interest rate, fixed 5.00%  
Subordinated Debt [Member] | Fixed Rate Notes [Member] | HSBC USA Inc [Member] | Maximum [Member]    
Debt Instrument [Line Items]    
Interest rate, fixed 9.30%  
Subordinated Debt [Member] | Fixed Rate Notes [Member] | HSBC Bank USA and its Subsidiaries [Member]    
Debt Instrument [Line Items]    
Long-term debt $ 2,685 3,676
Interest rate, weighted average 5.67%  
Subordinated Debt [Member] | Fixed Rate Notes [Member] | HSBC Bank USA and its Subsidiaries [Member] | Minimum [Member]    
Debt Instrument [Line Items]    
Interest rate, fixed 4.88%  
Subordinated Debt [Member] | Fixed Rate Notes [Member] | HSBC Bank USA and its Subsidiaries [Member] | Maximum [Member]    
Debt Instrument [Line Items]    
Interest rate, fixed 7.00%  
Subordinated Debt [Member] | Floating Rate Notes [Member] | HSBC USA Inc [Member]    
Debt Instrument [Line Items]    
Long-term debt $ 850 850
Interest rate, weighted average 4.12%  
Interest rate, floating 4.12%  
VIE-Issued Fixed Rate Notes [Member] | Fixed Rate Notes [Member] | HSBC Bank USA and its Subsidiaries [Member]    
Debt Instrument [Line Items]    
Long-term debt $ 0 $ 66