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Retained Earnings and Regulatory Capital Requirements - Capital Amounts and Ratios in Accordance With Current Banking Regulations (Details) - USD ($)
$ in Millions
Sep. 30, 2016
Dec. 31, 2015
HSBC USA Inc [Member]    
Common equity Tier 1 ratio:    
Capital Amount, Common Equity Tier 1 $ 17,939 $ 17,766
Well Capitalized Ratio Common equity Tier 1 [1],[2] 4.50% 4.50%
Actual Ratio Common equity Tier 1 13.50% 12.00%
Tier 1 capital ratio:    
Capital Amount, Tier 1 capital $ 19,003 $ 18,764
Well-Capitalized Ratio, Tier 1 capital [1] 6.00% 6.00%
Actual Ratio, Tier 1 Capital 14.30% 12.60%
Total capital ratio:    
Capital Amount $ 23,951 $ 24,425
Well-Capitalized Ratio [1] 10.00% 10.00%
Actual Ratio, Total Capital 18.00% 16.50%
Tier 1 leverage ratio:    
Capital Amount, Tier 1 leverage capital $ 19,003 $ 18,764
Well-Capitalized Ratio, Tier 1 leverage capital [1],[2] 4.00% 4.00%
Actual Ratio, Tier 1 leverage capital 9.10% 9.50%
Risk weighted assets:    
Risk Weighted Assets $ 132,885 $ 148,421
HSBC Bank USA, National Association [Member]    
Common equity Tier 1 ratio:    
Capital Amount, Common Equity Tier 1 $ 19,980 $ 19,796
Well Capitalized Ratio Common equity Tier 1 [1] 6.50% 6.50%
Actual Ratio Common equity Tier 1 15.60% 13.80%
Tier 1 capital ratio:    
Capital Amount, Tier 1 capital $ 22,334 $ 22,109
Well-Capitalized Ratio, Tier 1 capital [1] 8.00% 8.00%
Actual Ratio, Tier 1 Capital 17.40% 15.40%
Total capital ratio:    
Capital Amount $ 26,715 $ 26,670
Well-Capitalized Ratio [1] 10.00% 10.00%
Actual Ratio, Total Capital 20.80% 18.60%
Tier 1 leverage ratio:    
Capital Amount, Tier 1 leverage capital $ 22,334 $ 22,109
Well-Capitalized Ratio, Tier 1 leverage capital [1] 5.00% 5.00%
Actual Ratio, Tier 1 leverage capital 11.00% 11.60%
Risk weighted assets:    
Risk Weighted Assets $ 128,290 $ 143,393
[1] HSBC USA and HSBC Bank USA are categorized as "well-capitalized," as defined by their principal regulators. To be categorized as well-capitalized under regulatory guidelines, a banking institution must have the ratios reflected in the above table, and must not be subject to a directive, order, or written agreement to meet and maintain specific capital levels.
[2] There are no common equity Tier 1 or Tier 1 leverage ratio components in the definition of a well-capitalized bank holding company. The ratios shown are the regulatory minimum ratios.