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Retained Earnings and Regulatory Capital Requirements - Capital Amounts and Ratios in Accordance With Current Banking Regulations (Details)
$ in Millions
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
HSBC USA Inc [Member]    
Common equity Tier 1 ratio:    
Capital Amount, Common equity Tier 1 $ 15,891 $ 15,876
Well-Capitalized Ratio, Common equity Tier 1 [1],[2] 0.045 0.045
Actual Ratio, Common equity Tier 1 0.147 0.131
Tier 1 capital ratio:    
Capital Amount, Tier 1 capital $ 17,156 $ 17,141
Well-Capitalized Ratio, Tier 1 capital [1] 0.060 0.060
Actual Ratio, Tier 1 capital 0.159 0.141
Total capital ratio:    
Capital Amount, Total capital $ 20,680 $ 19,743
Well-Capitalized Ratio, Total capital [1] 0.100 0.100
Actual Ratio, Total capital 0.192 0.163
Tier 1 leverage ratio:    
Capital Amount, Tier 1 leverage capital $ 17,156 $ 17,141
Well-Capitalized Ratio, Tier 1 leverage capital [1],[2] 0.040 0.040
Actual Ratio, Tier 1 leverage capital 0.086 0.099
Supplementary Leverage Ratio [Abstract]    
Capital Amount, Supplementary Leverage Ratio $ 17,156 $ 17,141
Well-Capitalized Ratio, Supplementary Leverage Ratio [1],[3] 0.030 0.030
Actual Ratio, Supplementary Leverage Ratio 0.078 0.069
Risk weighted assets:    
Banking Regulation, Risk-Weighted Assets, Actual [4] $ 107,808 $ 121,407
Adjusted Quarterly Average Assets [Abstract]    
Adjusted quarterly average assets [5] 198,698 173,270
Total Leverage Exposure [Abstract]    
Total leverage exposure [6] 221,216 247,590
HSBC Bank USA [Member]    
Common equity Tier 1 ratio:    
Capital Amount, Common equity Tier 1 $ 18,180 $ 18,043
Well-Capitalized Ratio, Common equity Tier 1 [1] 0.065 0.065
Actual Ratio, Common equity Tier 1 0.172 0.152
Tier 1 capital ratio:    
Capital Amount, Tier 1 capital $ 20,680 $ 20,543
Well-Capitalized Ratio, Tier 1 capital [1] 0.080 0.080
Actual Ratio, Tier 1 capital 0.196 0.173
Total capital ratio:    
Capital Amount, Total capital $ 23,303 $ 22,724
Well-Capitalized Ratio, Total capital [1] 0.100 0.100
Actual Ratio, Total capital 0.220 0.192
Tier 1 leverage ratio:    
Capital Amount, Tier 1 leverage capital $ 20,680 $ 20,543
Well-Capitalized Ratio, Tier 1 leverage capital [1] 0.050 0.050
Actual Ratio, Tier 1 leverage capital 0.103 0.120
Supplementary Leverage Ratio [Abstract]    
Capital Amount, Supplementary Leverage Ratio $ 20,680 $ 20,543
Well-Capitalized Ratio, Supplementary Leverage Ratio [1],[3] 0.030 0.030
Actual Ratio, Supplementary Leverage Ratio 0.093 0.084
Risk weighted assets:    
Banking Regulation, Risk-Weighted Assets, Actual [4] $ 105,681 $ 118,618
Adjusted Quarterly Average Assets [Abstract]    
Adjusted quarterly average assets [5] 200,026 170,722
Total Leverage Exposure [Abstract]    
Total leverage exposure [6] $ 221,334 $ 244,008
[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 maintain capital equal to or in excess of 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 minimums.
[3] There is no SLR component in the definition of a well-capitalized banking institution. The ratios shown are the regulatory minimums.
[4] Calculated using the generally-applicable Standardized Approach.
[5] Represents the Tier 1 leverage ratio denominator which reflects quarterly average assets adjusted for amounts permitted to be deducted from Tier 1 capital.
[6] Represents the SLR denominator which includes adjusted quarterly average assets plus certain off-balance sheet exposures.