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Retained Earnings and Regulatory Capital Requirements - Capital Amounts and Ratios in Accordance With Current Banking Regulations (Details) - USD ($)
$ in Millions
Mar. 31, 2018
Dec. 31, 2017
HSBC USA Inc [Member]    
Common equity Tier 1 ratio:    
Capital Amount, Common Equity Tier 1 $ 16,979 $ 17,428
Well Capitalized Ratio, Common Equity Tier 1 [1],[2] 4.50% 4.50%
Actual Ratio, Common equity Tier 1 13.60% 14.20%
Tier 1 capital ratio:    
Capital Amount, Tier 1 capital $ 18,244 $ 18,696
Well-Capitalized Ratio, Tier 1 capital [1] 6.00% 6.00%
Actual Ratio, Tier 1 Capital 14.60% 15.30%
Total capital ratio:    
Capital Amount $ 21,839 $ 22,565
Well-Capitalized Ratio [1] 10.00% 10.00%
Actual Ratio, Total Capital 17.50% 18.40%
Tier 1 leverage ratio:    
Capital Amount, Tier 1 leverage capital $ 18,244 $ 18,696
Well-Capitalized Ratio, Tier 1 leverage capital [1],[2] 4.00% 4.00%
Actual Ratio, Tier 1 leverage capital 9.90% 9.90%
Supplementary Leverage Ratio [Abstract]    
Capital Amount, Supplementary Leverage Ratio $ 18,244  
Well-capitalized Ratio, Supplementary Leverage Ratio [1],[3] 3.00%  
Actual Ratio, Supplementary Leverage Ratio 7.30%  
Risk weighted assets:    
Risk Weighted Assets $ 124,937 $ 122,584
Adjusted Quarterly Average Assets [Abstract]    
Adjusted quarterly average assets [4] 183,539 188,774
Total Leverage Exposure [Abstract]    
Total leverage exposure [5] 250,718  
HSBC Bank USA [Member]    
Common equity Tier 1 ratio:    
Capital Amount, Common Equity Tier 1 $ 18,843 $ 19,294
Well Capitalized Ratio, Common Equity Tier 1 [1] 6.50% 6.50%
Actual Ratio, Common equity Tier 1 15.40% 16.70%
Tier 1 capital ratio:    
Capital Amount, Tier 1 capital $ 21,343 $ 21,786
Well-Capitalized Ratio, Tier 1 capital [1] 8.00% 8.00%
Actual Ratio, Tier 1 Capital 17.40% 18.80%
Total capital ratio:    
Capital Amount $ 24,996 $ 25,522
Well-Capitalized Ratio [1] 10.00% 10.00%
Actual Ratio, Total Capital 20.40% 22.10%
Tier 1 leverage ratio:    
Capital Amount, Tier 1 leverage capital $ 21,343 $ 21,786
Well-Capitalized Ratio, Tier 1 leverage capital [1] 5.00% 5.00%
Actual Ratio, Tier 1 leverage capital 11.80% 11.70%
Supplementary Leverage Ratio [Abstract]    
Capital Amount, Supplementary Leverage Ratio $ 21,343  
Well-capitalized Ratio, Supplementary Leverage Ratio [1],[3] 3.00%  
Actual Ratio, Supplementary Leverage Ratio 8.60%  
Risk weighted assets:    
Risk Weighted Assets $ 122,752 $ 115,667
Adjusted Quarterly Average Assets [Abstract]    
Adjusted quarterly average assets [4] 181,179 $ 186,551
Total Leverage Exposure [Abstract]    
Total leverage exposure [5] $ 247,662  
[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.
[3] Beginning January 1, 2018, HSBC USA and HSBC Bank USA are required to maintain the regulatory minimum SLR of 3 percent. There is no SLR component in the definition of a well-capitalized banking institution.
[4] Represents the Tier 1 leverage ratio denominator which reflects quarterly average assets adjusted for amounts permitted to be deducted from Tier 1 capital.
[5] Represents the SLR denominator which includes adjusted quarterly average assets plus certain off-balance sheet exposures.