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Retained Earnings and Regulatory Capital Requirements (Tables)
 12 Months Ended
Dec. 31, 2023
Retained Earnings Note Disclosure [Abstract]  
Capital Amounts and Ratios in Accordance With Current Banking Regulations The following table summarizes the capital amounts and ratios of HSBC USA and HSBC Bank USA, calculated in accordance with the Basel III rule at December 31, 2023 and 2022:
December 31, 2023December 31, 2022
  
Capital
Amount
Well-Capitalized 
Ratio(1)
 Actual
Ratio		Capital
Amount
Well-Capitalized
Ratio(1)
 Actual
Ratio
 (dollars are in millions)
Common equity Tier 1 ratio:
HSBC USA$12,822 4.5 %
(2)
13.0 %$13,950 4.5 %
(2)
13.5 %
HSBC Bank USA15,407 6.5 16.1 16,492 6.5 16.3 
Tier 1 capital ratio:
HSBC USA13,087 6.0 13.3 14,215 6.0 13.8 
HSBC Bank USA16,907 8.0 17.7 17,992 8.0 17.8 
Total capital ratio:
HSBC USA15,452 10.0 15.7 16,579 10.0 16.1 
HSBC Bank USA19,024 10.0 19.9 20,114 10.0 19.9 
Tier 1 leverage ratio:
HSBC USA13,087 4.0 
(2)
7.7 14,215 4.0 
(2)
8.5 
HSBC Bank USA16,907 5.0 10.2 17,992 5.0 10.9 
Risk-weighted assets:(3)
HSBC USA98,450 103,101 
HSBC Bank USA95,455 101,331 
Adjusted quarterly average assets:(4)
HSBC USA170,527 167,866 
HSBC Bank USA166,526 164,564 
(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)Calculated using the Standardized Approach.
(4)Represents the Tier 1 leverage ratio denominator which reflects quarterly average assets adjusted for amounts permitted to be deducted from Tier 1 capital.