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Retained Earnings and Regulatory Capital Requirements (Tables)
 9 Months Ended
Sep. 30, 2022
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 September 30, 2022 and December 31, 2021:
September 30, 2022December 31, 2021
  
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$14,892 4.5 %
(2)
14.0 %$15,341 4.5 %
(2)
15.1 %
HSBC Bank USA17,334 6.5 16.6 17,665 6.5 17.6 
Tier 1 capital ratio:
HSBC USA16,157 6.0 15.2 16,606 6.0 16.3 
HSBC Bank USA19,834 8.0 19.0 20,165 8.0 20.1 
Total capital ratio:
HSBC USA18,471 10.0 17.3 18,821 10.0 18.5 
HSBC Bank USA21,915 10.0 21.0 22,157 10.0 22.1 
Tier 1 leverage ratio:
HSBC USA16,157 4.0 
(2)
9.5 16,606 4.0 
(2)
8.5 
HSBC Bank USA19,834 5.0 11.9 20,165 5.0 10.5 
Risk-weighted assets:(3)
HSBC USA106,582 101,827 
HSBC Bank USA104,294 100,363 
Adjusted quarterly average assets:(4)
HSBC USA169,575 194,469 
HSBC Bank USA166,258 192,521 
(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.