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Retained Earnings and Regulatory Capital Requirements - Capital Amounts and Ratios in Accordance With Current Banking Regulations (Details) - USD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
HSBC USA Inc [Member]    
Common equity Tier 1 ratio:    
Capital Amount, Common Equity Tier 1 $ 15,876 $ 17,459
Well Capitalized Ratio, Common Equity Tier 1 [1],[2] 4.50% 4.50%
Actual Ratio, Common equity Tier 1 13.10% 13.60%
Tier 1 capital ratio:    
Capital Amount, Tier 1 capital $ 17,141 $ 18,724
Well-Capitalized Ratio, Tier 1 capital [1] 6.00% 6.00%
Actual Ratio, Tier 1 Capital 14.10% 14.60%
Total capital ratio:    
Capital Amount $ 19,743 $ 21,972
Well-Capitalized Ratio [1] 10.00% 10.00%
Actual Ratio, Total Capital 16.30% 17.20%
Tier 1 leverage ratio:    
Capital Amount, Tier 1 leverage capital $ 17,141 $ 18,724
Well-Capitalized Ratio, Tier 1 leverage capital [1],[2] 4.00% 4.00%
Actual Ratio, Tier 1 leverage capital 9.90% 11.00%
Supplementary Leverage Ratio [Abstract]    
Capital Amount, Supplementary Leverage Ratio $ 17,141 $ 18,724
Well-capitalized Ratio, Supplementary Leverage Ratio [1],[3] 3.00% 3.00%
Actual Ratio, Supplementary Leverage Ratio 6.90% 7.60%
Risk weighted assets:    
Risk Weighted Assets [4] $ 121,407 $ 127,917
Adjusted Quarterly Average Assets [Abstract]    
Adjusted quarterly average assets [5] 173,270 170,565
Total Leverage Exposure [Abstract]    
Total leverage exposure [6] 247,590 245,796
HSBC Bank USA [Member]    
Common equity Tier 1 ratio:    
Capital Amount, Common Equity Tier 1 $ 18,043 $ 19,456
Well Capitalized Ratio, Common Equity Tier 1 [1] 6.50% 6.50%
Actual Ratio, Common equity Tier 1 15.20% 15.70%
Tier 1 capital ratio:    
Capital Amount, Tier 1 capital $ 20,543 $ 21,956
Well-Capitalized Ratio, Tier 1 capital [1] 8.00% 8.00%
Actual Ratio, Tier 1 Capital 17.30% 17.70%
Total capital ratio:    
Capital Amount $ 22,724 $ 25,293
Well-Capitalized Ratio [1] 10.00% 10.00%
Actual Ratio, Total Capital 19.20% 20.40%
Tier 1 leverage ratio:    
Capital Amount, Tier 1 leverage capital $ 20,543 $ 21,956
Well-Capitalized Ratio, Tier 1 leverage capital [1] 5.00% 5.00%
Actual Ratio, Tier 1 leverage capital 12.00% 13.10%
Supplementary Leverage Ratio [Abstract]    
Capital Amount, Supplementary Leverage Ratio $ 20,543 $ 21,956
Well-capitalized Ratio, Supplementary Leverage Ratio [1],[3] 3.00% 3.00%
Actual Ratio, Supplementary Leverage Ratio 8.40% 9.10%
Risk weighted assets:    
Risk Weighted Assets [4] $ 118,618 $ 124,112
Adjusted Quarterly Average Assets [Abstract]    
Adjusted quarterly average assets [5] 170,722 168,154
Total Leverage Exposure [Abstract]    
Total leverage exposure [6] $ 244,008 $ 242,264
[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 minimums.
[3] There is no SLR component in the definition of a well-capitalized banking institution. The ratios shown are the regulatory minimum ratios.
[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.